CMU Advanced NLP 2024 (1) Introduction to NLP/transcript.srt

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so the class today is uh introduction to

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natural language processing and I'll be

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talking a little bit about you know what

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is natural language processing why we're

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motivated to do it and also some of the

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difficulties that we encounter and I'll

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at the end I'll also be talking about

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class Logistics so you can ask any

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Logistics questions at that

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time so if we talk about what is NLP

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anyway uh does anyone have any opinions

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about the definition of what natural

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language process would be oh one other

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thing I should mention is I am recording

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the class uh I put the class on YouTube

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uh afterwards I will not take pictures

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or video of any of you uh but if you

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talk your voice might come in the

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background so just uh be aware of that

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um usually not it's a directional mic so

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I try to repeat the questions after

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everybody um but uh for the people who

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are recordings uh listening to the

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recordings um so anyway what is NLP

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anyway does anybody have any ideas about

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the definition of what NLP might

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be

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yes okay um it so the answer was it

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helps machines understand language

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better uh so to facilitate human human

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and human machine interactions I think

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that's very good um it's

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uh similar to what I have written on my

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slide here uh but natur in addition to

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natural language understanding there's

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one major other segment of NLP uh does

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anyone uh have an idea what that might

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be we often have a dichotomy between two

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major segments natural language

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understanding and natural language

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generation yeah exactly so I I would say

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that's almost perfect if you had said

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understand and generate so very good um

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so I I say natural technology to handle

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human language usually text using

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computers uh to Aid human machine

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communication and this can include

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things like question answering dialogue

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or generation of code that can be

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executed with uh

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computers it can also Aid human human

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communication and this can include

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things like machine translation or spell

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checking or assisted writing

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and then a final uh segment that people

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might think about a little bit less is

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analyzing and understanding a language

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and this includes things like syntactic

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analysis text classification entity

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recognition and linking and these can be

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used for uh various reasons not

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necessarily for direct human machine

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communication but also for like

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aggregating information across large

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things for scientific studies and other

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things like that I'll give a few

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examples of

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this um we now use an many times a day

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sometimes without even knowing it so uh

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whenever you're typing a doc in Google

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Docs there's you know spell checking and

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grammar checking going on behind it's

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gotten frighten frighteningly good

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recently that where it checks like most

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of my mistakes and rarely Flags things

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that are not mistakes so obviously they

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have powerful models running behind that

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uh

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so and it can do things like answer

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questions uh so I asked chat GPT who is

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the current president of Carnegie melan

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University and chat GPT said I did a

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quick search for more information here

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is what I found uh the current president

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of car Mel University is faram Janan he

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has been serving since July 1 etc etc so

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as far as I can tell that's

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correct um at the same time I asked how

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many layers are included in the GP 3.5

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turbo architecture and it said to me

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GPT 3.5 turbo which is an optimized

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version of GPT 3.5 for faster responses

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doesn't have a specific layer art

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structure like the traditional gpt3

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models um and I don't know if this is

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true or not but I'm pretty sure it's not

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true I'm pretty sure that you know GPT

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is a model that's much like other models

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uh so it basically just made up the spec

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because it didn't have any information

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on the Internet or couldn't talk about

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it so

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um another thing is uh NLP can translate

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text pretty well so I ran um Google

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translate uh on Japanese uh this example

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is a little bit old it's from uh you

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know a few years ago about Co but I I

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retranslated it a few days ago and it

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comes up pretty good uh you can

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basically understand what's going on

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here it's not perfect but you can

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understand the uh the general uh

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gist at the same time uh if I put in a

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relatively low resource language this is

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Kurdish um it has a number of problems

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when you try to understand it and just

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to give an example this is talking about

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uh some uh paleontology Discovery it

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called this person a fossil scientist

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instead of the kind of obvious English

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term

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paleontologist um and it's talking about

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three different uh T-Rex species uh how

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T-Rex should actually be split into

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three species where T-Rex says king of

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ferocious lizards emperator says emperor

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of Savaged lizards and then T Regina

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means clean of ferocious snail I'm

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pretty sure that's not snail I'm pretty

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sure that's lizard so uh you can see

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that this is not uh this is not perfect

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either some people might be thinking why

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Google translate and why not GPD well it

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turns out um according to one of the

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recent studies we've done GPD is even

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worse at these slow resource languages

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so I use the best thing that's out

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there um another thing is language

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analysis can Aid scientific ific inquiry

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so this is an example that I've been

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using for a long time it's actually from

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Martin sap another faculty member here

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uh but I have been using it since uh

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like before he joined and it uh this is

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an example from computational social

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science uh answering questions about

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Society given observational data and

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their question was do movie scripts

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portray female or male characters with

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more power or agency in movie script

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films so it's asking kind of a so

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societal question by using NLP

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technology and the way they did it is

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they basically analyzed text trying to

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find

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uh the uh agents and patients in a a

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particular text which are the the things

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that are doing things and the things

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that things are being done to and you

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can see that essentially male characters

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in these movie scripts were given more

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power in agency and female characters

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were given less power in agency and they

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were able to do this because they had

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NLP technology that analyzed and

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extracted useful data and made turned it

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into a very easy form to do kind of

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analysis of the variety that they want

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so um I think that's a major use case of

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NLP technology that does language

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analysis nowadays turn it into a form

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that allows you to very quickly do

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aggregate queries and other things like

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this um but at the same time uh language

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analysis tools fail at very basic tasks

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so these are

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some things that I ran through a named

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entity recognizer and these were kind of

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very nice named entity recognizers uh

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that a lot of people were using for

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example Stanford core NLP and Spacey and

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both of them I just threw in the first

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thing that I found on the New York Times

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at the time and it basically made at

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least one mistake in the first sentence

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and here it recognizes Baton Rouge as an

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organization and here it recognized

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hurricane EA as an organization so um

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like even uh these things that we expect

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should work pretty well make pretty

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Solly

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mistakes so in the class uh basically

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what I want to cover is uh what goes

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into building uh state-of-the-art NLP

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systems that work really well on a wide

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variety of tasks um where do current

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systems

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fail and how can we make appropriate

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improvements and Achieve whatever we

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want to do with nalp and this set of

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questions that I'm asking here is

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exactly the same as the set of questions

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that I was asking two years ago before

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chat GPT uh I still think they're

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important questions but I think the

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answers to these questions is very

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different and because of that we're

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updating the class materials to try to

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cover you know the answers to these

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questions and uh in kind of the era of

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large language models and other things

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like

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that

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so that's all I have for the intro maybe

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maybe pretty straightforward are there

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any questions or comments so far if not

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I'll I'll just go

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on okay great so I want to uh first go

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into a very high Lev overview of NLP

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system building and most of the stuff

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that I want to do today is to set the

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stage for what I'm going to be talking

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about in more detail uh over the rest of

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the

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class and we could think of NLP syst

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systems through this kind of General

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framework where we want to create a

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function to map an input X into an

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output y uh where X and or Y involve

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language and uh do some people have

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favorite NLP tasks or NLP tasks that you

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want to uh want to be handling in some

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way or maybe what what do you think are

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the most popular and important NLP tasks

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nowadays

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okay so translation is maybe easy what's

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the input and output of

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translation okay yeah so uh in

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Translation inputs text in one language

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output is text in another language and

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then what what is a good

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translation yeah corre or or the same is

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the input basically yes um it also

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should be fluent but I agree any other

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things generation the reason why I said

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it's tough is it's pretty broad um and

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it's not like we could be doing

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generation with lots of different inputs

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but um yeah any any other things maybe a

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little bit different yeah like

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scenario a scenario and a multiple

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choice question about the scenario and

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so what would the scenario in the

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multiple choice question are probably

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the input and then the output

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is an answer to the multiple choice

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question um and then there it's kind of

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obvious like what is good it's the

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correct answer sure um interestingly I

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think a lot of llm evaluation is done on

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these multiple choice questions but I'm

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yet to encounter an actual application

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that cares about multiple choice

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question answering so uh there's kind of

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a funny disconnect there but uh yeah I

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saw hand that think about V search comp

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yeah Vector search uh that's very good

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so the input

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is can con it into or understanding and

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it to

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another okay yeah so I'd say the input

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there is a query and a document base um

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and then the output is maybe an index

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into the document or or something else

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like that sure um and then something

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that's good here here's a good question

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what what's a good result from

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00:12:06,560 --> 00:12:10,200
that what's a good

279
00:12:10,839 --> 00:12:19,279
output be sort of simar the major

280
00:12:15,560 --> 00:12:21,680
problem there I see is how you def SAR

281
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and how you

282
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a always like you understand

283
00:12:26,199 --> 00:12:33,000
whether is actually

284
00:12:29,760 --> 00:12:35,079
yeah exactly so that um just to repeat

285
00:12:33,000 --> 00:12:36,880
it's like uh we need to have a

286
00:12:35,079 --> 00:12:38,399
similarity a good similarity metric we

287
00:12:36,880 --> 00:12:40,120
need to have a good threshold where we

288
00:12:38,399 --> 00:12:41,760
get like the ones we want and we don't

289
00:12:40,120 --> 00:12:43,240
get the ones we don't want we're going

290
00:12:41,760 --> 00:12:44,959
to talk more about that in the retrieval

291
00:12:43,240 --> 00:12:48,440
lecture exactly how we evaluate and

292
00:12:44,959 --> 00:12:49,920
stuff but um yeah good so this is a good

293
00:12:48,440 --> 00:12:53,279
uh here are some good examples I have

294
00:12:49,920 --> 00:12:55,519
some examples of my own um the first one

295
00:12:53,279 --> 00:12:58,360
is uh kind of the very generic one maybe

296
00:12:55,519 --> 00:13:00,800
kind of like generation here but text in

297
00:12:58,360 --> 00:13:02,959
continuing text uh so this is language

298
00:13:00,800 --> 00:13:04,160
modeling so you have a text and then you

299
00:13:02,959 --> 00:13:05,440
have the continuation you want to

300
00:13:04,160 --> 00:13:07,680
predict the

301
00:13:05,440 --> 00:13:10,480
continuation um text and text in another

302
00:13:07,680 --> 00:13:13,040
language is translation uh text in a

303
00:13:10,480 --> 00:13:15,800
label could be text classification uh

304
00:13:13,040 --> 00:13:17,760
text in linguistic structure or uh some

305
00:13:15,800 --> 00:13:21,360
s kind of entities or something like

306
00:13:17,760 --> 00:13:22,680
that could be uh language analysis or um

307
00:13:21,360 --> 00:13:24,839
information

308
00:13:22,680 --> 00:13:29,440
extraction uh we could also have image

309
00:13:24,839 --> 00:13:31,320
and text uh which is image captioning um

310
00:13:29,440 --> 00:13:33,560
or speech and text which is speech

311
00:13:31,320 --> 00:13:35,240
recognition and I take the very broad

312
00:13:33,560 --> 00:13:38,000
view of natural language processing

313
00:13:35,240 --> 00:13:39,519
which is if it's any variety of language

314
00:13:38,000 --> 00:13:41,519
uh if you're handling language in some

315
00:13:39,519 --> 00:13:42,800
way it's natural language processing it

316
00:13:41,519 --> 00:13:45,880
doesn't necessarily have to be text

317
00:13:42,800 --> 00:13:47,480
input text output um so that's relevant

318
00:13:45,880 --> 00:13:50,199
for the projects that you're thinking

319
00:13:47,480 --> 00:13:52,160
about too at the end of this course so

320
00:13:50,199 --> 00:13:55,519
the the most common FAQ for this course

321
00:13:52,160 --> 00:13:57,839
is does my project count and if you're

322
00:13:55,519 --> 00:13:59,360
uncertain you should ask but usually

323
00:13:57,839 --> 00:14:01,040
like if it has some sort of language

324
00:13:59,360 --> 00:14:05,079
involved then I'll usually say yes it

325
00:14:01,040 --> 00:14:07,920
does kind so um if it's like uh code to

326
00:14:05,079 --> 00:14:09,680
code there that's not code is not

327
00:14:07,920 --> 00:14:11,480
natural language it is language but it's

328
00:14:09,680 --> 00:14:13,000
not natural language so that might be

329
00:14:11,480 --> 00:14:15,320
borderline we might have to discuss

330
00:14:13,000 --> 00:14:15,320
about

331
00:14:15,759 --> 00:14:21,800
that cool um so next I'd like to talk

332
00:14:18,880 --> 00:14:25,240
about methods for creating NLP systems

333
00:14:21,800 --> 00:14:27,839
um and there's a lot of different ways

334
00:14:25,240 --> 00:14:29,720
to create MLP systems all of these are

335
00:14:27,839 --> 00:14:32,880
alive and well in

336
00:14:29,720 --> 00:14:35,759
2024 uh the first one is Rule uh

337
00:14:32,880 --> 00:14:37,959
rule-based system creation and so the

338
00:14:35,759 --> 00:14:40,399
way this works is like let's say you

339
00:14:37,959 --> 00:14:42,480
want to build a text classifier you just

340
00:14:40,399 --> 00:14:46,560
write the simple python function that

341
00:14:42,480 --> 00:14:48,639
classifies things into uh sports or

342
00:14:46,560 --> 00:14:50,240
other and the way it classifies it into

343
00:14:48,639 --> 00:14:52,959
sports or other is it checks whether

344
00:14:50,240 --> 00:14:55,160
baseball soccer football and Tennis are

345
00:14:52,959 --> 00:14:59,399
included in the document and classifies

346
00:14:55,160 --> 00:15:01,959
it into uh Sports if so uh other if not

347
00:14:59,399 --> 00:15:05,279
so has anyone written something like

348
00:15:01,959 --> 00:15:09,720
this maybe not a text classifier but um

349
00:15:05,279 --> 00:15:11,880
you know to identify entities or uh

350
00:15:09,720 --> 00:15:14,279
split words

351
00:15:11,880 --> 00:15:16,680
or something like

352
00:15:14,279 --> 00:15:18,399
that has anybody not ever written

353
00:15:16,680 --> 00:15:22,800
anything like

354
00:15:18,399 --> 00:15:24,639
this yeah that's what I thought so um

355
00:15:22,800 --> 00:15:26,079
rule-based systems are very convenient

356
00:15:24,639 --> 00:15:28,920
when you don't really care about how

357
00:15:26,079 --> 00:15:30,759
good your system is um or you're doing

358
00:15:28,920 --> 00:15:32,360
that's really really simple and like

359
00:15:30,759 --> 00:15:35,600
it'll be perfect even if you do the very

360
00:15:32,360 --> 00:15:37,079
simple thing and so I I think it's worth

361
00:15:35,600 --> 00:15:39,959
talking a little bit about them and I'll

362
00:15:37,079 --> 00:15:43,319
talk a little bit about that uh this

363
00:15:39,959 --> 00:15:45,680
time the second thing which like very

364
00:15:43,319 --> 00:15:47,680
rapidly over the course of maybe three

365
00:15:45,680 --> 00:15:50,279
years or so has become actually maybe

366
00:15:47,680 --> 00:15:52,720
the dominant Paradigm in NLP is

367
00:15:50,279 --> 00:15:56,360
prompting uh in prompting a language

368
00:15:52,720 --> 00:15:58,560
model and the way this works is uh you

369
00:15:56,360 --> 00:16:00,720
ask a language model if the following

370
00:15:58,560 --> 00:16:03,079
sent is about sports reply Sports

371
00:16:00,720 --> 00:16:06,120
otherwise reply other and you feed it to

372
00:16:03,079 --> 00:16:08,480
your favorite LM uh usually that's GPT

373
00:16:06,120 --> 00:16:11,399
something or other uh sometimes it's an

374
00:16:08,480 --> 00:16:14,440
open source model of some variety and

375
00:16:11,399 --> 00:16:17,759
then uh it will give you the

376
00:16:14,440 --> 00:16:20,639
answer and then finally uh fine-tuning

377
00:16:17,759 --> 00:16:22,240
uh so you take some paired data and you

378
00:16:20,639 --> 00:16:23,600
do machine learning from paired data

379
00:16:22,240 --> 00:16:25,680
where you have something like I love to

380
00:16:23,600 --> 00:16:27,440
play baseball uh the stock price is

381
00:16:25,680 --> 00:16:29,519
going up he got a hatrick yesterday he

382
00:16:27,440 --> 00:16:32,759
is wearing tennis shoes and you assign

383
00:16:29,519 --> 00:16:35,319
all these uh labels to them training a

384
00:16:32,759 --> 00:16:38,160
model and you can even start out with a

385
00:16:35,319 --> 00:16:41,480
prompting based model and fine-tune a a

386
00:16:38,160 --> 00:16:41,480
language model

387
00:16:42,920 --> 00:16:49,399
also so one major consideration when

388
00:16:47,519 --> 00:16:52,000
you're Building Systems like this is the

389
00:16:49,399 --> 00:16:56,440
data requirements for building such a

390
00:16:52,000 --> 00:16:59,319
system and for rules or prompting where

391
00:16:56,440 --> 00:17:02,240
it's just based on intuition really no

392
00:16:59,319 --> 00:17:04,640
data is needed whatsoever it you don't

393
00:17:02,240 --> 00:17:08,240
need a single example and you can start

394
00:17:04,640 --> 00:17:11,000
writing rules or like just just to give

395
00:17:08,240 --> 00:17:12,640
an example the rules and prompts I wrote

396
00:17:11,000 --> 00:17:14,679
here I didn't look at any examples and I

397
00:17:12,640 --> 00:17:17,240
just wrote them uh so this is something

398
00:17:14,679 --> 00:17:20,000
that you could start out

399
00:17:17,240 --> 00:17:21,559
with uh the problem is you also have no

400
00:17:20,000 --> 00:17:24,720
idea how well it works if you don't have

401
00:17:21,559 --> 00:17:26,760
any data whatsoever right so um you'll

402
00:17:24,720 --> 00:17:30,400
you might be in trouble if you think

403
00:17:26,760 --> 00:17:30,400
something should be working

404
00:17:30,919 --> 00:17:34,440
so normally the next thing that people

405
00:17:32,919 --> 00:17:36,880
move to nowadays when they're building

406
00:17:34,440 --> 00:17:39,559
practical systems is rules are prompting

407
00:17:36,880 --> 00:17:41,240
based on spot checks so that basically

408
00:17:39,559 --> 00:17:42,919
means that you start out with a

409
00:17:41,240 --> 00:17:45,840
rule-based system or a prompting based

410
00:17:42,919 --> 00:17:47,240
system and then you go in and you run it

411
00:17:45,840 --> 00:17:48,720
on some data that you're interested in

412
00:17:47,240 --> 00:17:50,799
you just kind of qualitatively look at

413
00:17:48,720 --> 00:17:52,160
the data and say oh it's messing up here

414
00:17:50,799 --> 00:17:53,440
then you go in and fix your prompt a

415
00:17:52,160 --> 00:17:54,919
little bit or you go in and fix your

416
00:17:53,440 --> 00:17:57,320
rules a little bit or something like

417
00:17:54,919 --> 00:18:00,400
that so uh this is kind of the second

418
00:17:57,320 --> 00:18:00,400
level of difficulty

419
00:18:01,400 --> 00:18:04,640
so the third level of difficulty would

420
00:18:03,159 --> 00:18:07,400
be something like rules are prompting

421
00:18:04,640 --> 00:18:09,039
with rigorous evaluation and so here you

422
00:18:07,400 --> 00:18:12,840
would create a development set with

423
00:18:09,039 --> 00:18:14,840
inputs and outputs uh so you uh create

424
00:18:12,840 --> 00:18:17,039
maybe 200 to 2,000

425
00:18:14,840 --> 00:18:20,080
examples um

426
00:18:17,039 --> 00:18:21,720
and then evaluate your actual accuracy

427
00:18:20,080 --> 00:18:23,880
so you need an evaluation metric you

428
00:18:21,720 --> 00:18:26,120
need other things like this this is the

429
00:18:23,880 --> 00:18:28,400
next level of difficulty but if you're

430
00:18:26,120 --> 00:18:30,240
going to be a serious you know NLP

431
00:18:28,400 --> 00:18:33,000
engineer or something like this you

432
00:18:30,240 --> 00:18:34,720
definitely will be doing this a lot I

433
00:18:33,000 --> 00:18:37,760
feel and

434
00:18:34,720 --> 00:18:40,360
then so that here now you start needing

435
00:18:37,760 --> 00:18:41,960
a depth set and a test set and then

436
00:18:40,360 --> 00:18:46,280
finally fine-tuning you need an

437
00:18:41,960 --> 00:18:48,480
additional training set um and uh this

438
00:18:46,280 --> 00:18:52,240
will generally be a lot bigger than 200

439
00:18:48,480 --> 00:18:56,080
to 2,000 examples and generally the rule

440
00:18:52,240 --> 00:18:56,080
is that every time you

441
00:18:57,320 --> 00:19:01,080
double

442
00:18:59,520 --> 00:19:02,400
every time you double your training set

443
00:19:01,080 --> 00:19:07,480
size you get about a constant

444
00:19:02,400 --> 00:19:07,480
Improvement so if you start

445
00:19:07,799 --> 00:19:15,080
out if you start out down here with

446
00:19:12,240 --> 00:19:17,039
um zero shot accuracy with a language

447
00:19:15,080 --> 00:19:21,559
model you you create a small printing

448
00:19:17,039 --> 00:19:21,559
set and you get you know a pretty big

449
00:19:22,000 --> 00:19:29,120
increase and then every time you double

450
00:19:26,320 --> 00:19:30,799
it it increases by constant fact it's

451
00:19:29,120 --> 00:19:32,480
kind of like just in general in machine

452
00:19:30,799 --> 00:19:37,360
learning this is a trend that we tend to

453
00:19:32,480 --> 00:19:40,679
see so um So based on this

454
00:19:37,360 --> 00:19:41,880
uh there's kind of like you get a big

455
00:19:40,679 --> 00:19:44,200
gain from having a little bit of

456
00:19:41,880 --> 00:19:45,760
training data but the gains very quickly

457
00:19:44,200 --> 00:19:48,919
drop off and you start spending a lot of

458
00:19:45,760 --> 00:19:48,919
time annotating

459
00:19:51,000 --> 00:19:55,880
an so um yeah this is the the general

460
00:19:54,760 --> 00:19:58,280
overview of the different types of

461
00:19:55,880 --> 00:20:00,000
system building uh any any question

462
00:19:58,280 --> 00:20:01,559
questions about this or comments or

463
00:20:00,000 --> 00:20:04,000
things like

464
00:20:01,559 --> 00:20:05,840
this I think one thing that's changed

465
00:20:04,000 --> 00:20:08,159
really drastically from the last time I

466
00:20:05,840 --> 00:20:09,600
taught this class is the fact that

467
00:20:08,159 --> 00:20:11,000
number one and number two are the things

468
00:20:09,600 --> 00:20:13,799
that people are actually doing in

469
00:20:11,000 --> 00:20:15,360
practice uh which was you know people

470
00:20:13,799 --> 00:20:16,679
who actually care about systems are

471
00:20:15,360 --> 00:20:18,880
doing number one and number two is the

472
00:20:16,679 --> 00:20:20,440
main thing it used to be that if you

473
00:20:18,880 --> 00:20:22,679
were actually serious about building a

474
00:20:20,440 --> 00:20:24,320
system uh you really needed to do the

475
00:20:22,679 --> 00:20:27,080
funing and now it's kind of like more

476
00:20:24,320 --> 00:20:27,080
optional

477
00:20:27,159 --> 00:20:30,159
so

478
00:20:44,039 --> 00:20:50,960
yeah

479
00:20:46,320 --> 00:20:53,960
so it's it's definitely an empirical

480
00:20:50,960 --> 00:20:53,960
observation

481
00:20:54,720 --> 00:21:01,080
um in terms of the theoretical

482
00:20:57,640 --> 00:21:03,120
background I am not I can't immediately

483
00:21:01,080 --> 00:21:05,840
point to a

484
00:21:03,120 --> 00:21:10,039
particular paper that does that but I

485
00:21:05,840 --> 00:21:12,720
think if you think about

486
00:21:10,039 --> 00:21:14,720
the I I think I have seen that they do

487
00:21:12,720 --> 00:21:17,039
exist in the past but I I can't think of

488
00:21:14,720 --> 00:21:19,000
it right now I can try to uh try to come

489
00:21:17,039 --> 00:21:23,720
up with an example of

490
00:21:19,000 --> 00:21:23,720
that so yeah I I should take

491
00:21:26,799 --> 00:21:31,960
notes or someone wants to share one on

492
00:21:29,360 --> 00:21:33,360
Piaza uh if you have any ideas and want

493
00:21:31,960 --> 00:21:34,520
to share on Patza I'm sure that would be

494
00:21:33,360 --> 00:21:35,640
great it'd be great to have a discussion

495
00:21:34,520 --> 00:21:39,320
on

496
00:21:35,640 --> 00:21:44,960
Patza um Pi

497
00:21:39,320 --> 00:21:46,880
one cool okay so next I want to try to

498
00:21:44,960 --> 00:21:48,200
make a rule-based system and I'm going

499
00:21:46,880 --> 00:21:49,360
to make a rule-based system for

500
00:21:48,200 --> 00:21:51,799
sentiment

501
00:21:49,360 --> 00:21:53,480
analysis uh and this is a bad idea I

502
00:21:51,799 --> 00:21:55,400
would not encourage you to ever do this

503
00:21:53,480 --> 00:21:57,440
in real life but I want to do it here to

504
00:21:55,400 --> 00:21:59,640
show you why it's a bad idea and like

505
00:21:57,440 --> 00:22:01,200
what are some of the hard problems that

506
00:21:59,640 --> 00:22:03,960
you encounter when trying to create a

507
00:22:01,200 --> 00:22:06,600
system based on rules

508
00:22:03,960 --> 00:22:08,080
and then we'll move into building a

509
00:22:06,600 --> 00:22:12,360
machine learning base system after we

510
00:22:08,080 --> 00:22:15,400
finish this so if we look at the example

511
00:22:12,360 --> 00:22:18,559
test this is review sentiment analysis

512
00:22:15,400 --> 00:22:21,799
it's one of the most valuable uh tasks

513
00:22:18,559 --> 00:22:24,039
uh that people do in NLP nowadays

514
00:22:21,799 --> 00:22:26,400
because it allows people to know how

515
00:22:24,039 --> 00:22:29,200
customers are thinking about products uh

516
00:22:26,400 --> 00:22:30,799
improve their you know their product

517
00:22:29,200 --> 00:22:32,919
development and other things like that

518
00:22:30,799 --> 00:22:34,799
may monitor people's you know

519
00:22:32,919 --> 00:22:36,760
satisfaction with their social media

520
00:22:34,799 --> 00:22:39,200
service other things like this so

521
00:22:36,760 --> 00:22:42,720
basically the way it works is um you

522
00:22:39,200 --> 00:22:44,400
have uh outputs or you have sentences

523
00:22:42,720 --> 00:22:46,720
inputs like I hate this movie I love

524
00:22:44,400 --> 00:22:48,520
this movie I saw this movie and this

525
00:22:46,720 --> 00:22:50,600
gets mapped into positive neutral or

526
00:22:48,520 --> 00:22:53,120
negative so I hate this movie would be

527
00:22:50,600 --> 00:22:55,480
negative I love this movie positive and

528
00:22:53,120 --> 00:22:59,039
I saw this movie is

529
00:22:55,480 --> 00:23:01,200
neutral so um

530
00:22:59,039 --> 00:23:05,200
that that's the task input tax output

531
00:23:01,200 --> 00:23:08,880
labels uh Kary uh sentence

532
00:23:05,200 --> 00:23:11,679
label and in order to do this uh we

533
00:23:08,880 --> 00:23:13,120
would like to build a model um and we're

534
00:23:11,679 --> 00:23:16,159
going to build the model in a rule based

535
00:23:13,120 --> 00:23:19,000
way but it we'll still call it a model

536
00:23:16,159 --> 00:23:21,600
and the way it works is we do feature

537
00:23:19,000 --> 00:23:23,159
extraction um so we extract the Salient

538
00:23:21,600 --> 00:23:25,279
features for making the decision about

539
00:23:23,159 --> 00:23:27,320
what to Output next we do score

540
00:23:25,279 --> 00:23:29,880
calculation calculate a score for one or

541
00:23:27,320 --> 00:23:32,320
more possib ities and we have a decision

542
00:23:29,880 --> 00:23:33,520
function so we choose one of those

543
00:23:32,320 --> 00:23:37,679
several

544
00:23:33,520 --> 00:23:40,120
possibilities and so for feature

545
00:23:37,679 --> 00:23:42,200
extraction uh formally what this looks

546
00:23:40,120 --> 00:23:44,240
like is we have some function and it

547
00:23:42,200 --> 00:23:48,039
extracts a feature

548
00:23:44,240 --> 00:23:51,159
Vector for score calculation um we

549
00:23:48,039 --> 00:23:54,240
calculate the scores based on either a

550
00:23:51,159 --> 00:23:56,279
binary classification uh where we have a

551
00:23:54,240 --> 00:23:58,279
a weight vector and we take the dot

552
00:23:56,279 --> 00:24:00,120
product with our feature vector or we

553
00:23:58,279 --> 00:24:02,480
have multi class classification where we

554
00:24:00,120 --> 00:24:04,520
have a weight Matrix and we take the

555
00:24:02,480 --> 00:24:08,640
product with uh the vector and that

556
00:24:04,520 --> 00:24:08,640
gives us you know squares over multiple

557
00:24:08,919 --> 00:24:14,840
classes and then we have a decision uh

558
00:24:11,600 --> 00:24:17,520
rule so this decision rule tells us what

559
00:24:14,840 --> 00:24:20,080
the output is going to be um does anyone

560
00:24:17,520 --> 00:24:22,200
know what a typical decision rule is

561
00:24:20,080 --> 00:24:24,520
maybe maybe so obvious that you don't

562
00:24:22,200 --> 00:24:28,760
think about it often

563
00:24:24,520 --> 00:24:31,000
but uh a threshold um so like for would

564
00:24:28,760 --> 00:24:34,440
that be for binary a single binary

565
00:24:31,000 --> 00:24:37,000
scaler score or a multiple

566
00:24:34,440 --> 00:24:38,520
class binary yeah so and then you would

567
00:24:37,000 --> 00:24:39,960
pick a threshold and if it's over the

568
00:24:38,520 --> 00:24:42,919
threshold

569
00:24:39,960 --> 00:24:45,760
you say yes and if it's under the

570
00:24:42,919 --> 00:24:50,279
threshold you say no um another option

571
00:24:45,760 --> 00:24:51,679
would be um you have a threshold and you

572
00:24:50,279 --> 00:24:56,080
say

573
00:24:51,679 --> 00:24:56,080
yes no

574
00:24:56,200 --> 00:25:00,559
obain so you know you don't give an

575
00:24:58,360 --> 00:25:02,520
answer and depending on how you're

576
00:25:00,559 --> 00:25:03,720
evaluated what what is a good classifier

577
00:25:02,520 --> 00:25:07,799
you might want to abstain some of the

578
00:25:03,720 --> 00:25:10,960
time also um for multiclass what what's

579
00:25:07,799 --> 00:25:10,960
a standard decision role for

580
00:25:11,120 --> 00:25:16,720
multiclass argmax yeah exactly so um

581
00:25:14,279 --> 00:25:19,520
basically you you find the index that

582
00:25:16,720 --> 00:25:22,000
has the highest score in you output

583
00:25:19,520 --> 00:25:24,480
it we're going to be talking about other

584
00:25:22,000 --> 00:25:26,559
decision rules also um like

585
00:25:24,480 --> 00:25:29,480
self-consistency and minimum based risk

586
00:25:26,559 --> 00:25:30,760
later uh for text generation so you can

587
00:25:29,480 --> 00:25:33,000
just keep that in mind and then we'll

588
00:25:30,760 --> 00:25:36,279
forget about it for like several

589
00:25:33,000 --> 00:25:39,559
classes um so for sentiment

590
00:25:36,279 --> 00:25:42,159
class um I have a Cod

591
00:25:39,559 --> 00:25:45,159
walk

592
00:25:42,159 --> 00:25:45,159
here

593
00:25:46,240 --> 00:25:54,320
and this is pretty simple um but if

594
00:25:50,320 --> 00:25:58,559
you're bored uh of the class and would

595
00:25:54,320 --> 00:26:01,000
like to um try out yourself you can

596
00:25:58,559 --> 00:26:04,480
Challenge and try to get a better score

597
00:26:01,000 --> 00:26:06,120
than I do um over the next few minutes

598
00:26:04,480 --> 00:26:06,880
but we have this rule based classifier

599
00:26:06,120 --> 00:26:10,240
in

600
00:26:06,880 --> 00:26:12,640
here and I will open it up in my vs

601
00:26:10,240 --> 00:26:15,360
code

602
00:26:12,640 --> 00:26:18,360
to try to create a rule-based classifier

603
00:26:15,360 --> 00:26:18,360
and basically the way this

604
00:26:22,799 --> 00:26:29,960
works is

605
00:26:25,159 --> 00:26:29,960
that we have a feature

606
00:26:31,720 --> 00:26:37,720
extraction we have feature extraction we

607
00:26:34,120 --> 00:26:40,679
have scoring and we have um a decision

608
00:26:37,720 --> 00:26:43,480
rle so here for our feature extraction I

609
00:26:40,679 --> 00:26:44,720
have created a list of good words and a

610
00:26:43,480 --> 00:26:46,720
list of bad

611
00:26:44,720 --> 00:26:48,960
words

612
00:26:46,720 --> 00:26:51,320
and what we do is we just count the

613
00:26:48,960 --> 00:26:53,000
number of good words that appeared and

614
00:26:51,320 --> 00:26:55,320
count the number of bad words that

615
00:26:53,000 --> 00:26:57,880
appeared then we also have a bias

616
00:26:55,320 --> 00:27:01,159
feature so the bias feature is a feature

617
00:26:57,880 --> 00:27:03,679
that's always one and so what that

618
00:27:01,159 --> 00:27:06,799
results in is we have a dimension three

619
00:27:03,679 --> 00:27:08,880
feature Vector um where this is like the

620
00:27:06,799 --> 00:27:11,320
number of good words this is the number

621
00:27:08,880 --> 00:27:15,320
of bad words and then you have the

622
00:27:11,320 --> 00:27:17,760
bias and then I also Define the feature

623
00:27:15,320 --> 00:27:20,039
weights that so for every good word we

624
00:27:17,760 --> 00:27:22,200
add one to our score for every bad word

625
00:27:20,039 --> 00:27:25,559
we add uh we subtract one from our score

626
00:27:22,200 --> 00:27:29,399
and for the BIOS we absor and so we then

627
00:27:25,559 --> 00:27:30,480
take the dot product between

628
00:27:29,399 --> 00:27:34,360
these

629
00:27:30,480 --> 00:27:36,919
two and we get minus

630
00:27:34,360 --> 00:27:37,640
0.5 and that gives us uh that gives us

631
00:27:36,919 --> 00:27:41,000
the

632
00:27:37,640 --> 00:27:46,000
squore so let's run

633
00:27:41,000 --> 00:27:50,320
that um and I read in some

634
00:27:46,000 --> 00:27:52,600
data and what this data looks like is

635
00:27:50,320 --> 00:27:55,000
basically we have a

636
00:27:52,600 --> 00:27:57,559
review um which says the rock is

637
00:27:55,000 --> 00:27:59,480
destined to be the 21st Century's new

638
00:27:57,559 --> 00:28:01,240
Conan and that he's going to make a

639
00:27:59,480 --> 00:28:03,600
splash even greater than Arnold

640
00:28:01,240 --> 00:28:07,000
Schwarzenegger jeanclaude vanam or

641
00:28:03,600 --> 00:28:09,519
Steven Seagal um so this seems pretty

642
00:28:07,000 --> 00:28:10,840
positive right I like that's a pretty

643
00:28:09,519 --> 00:28:13,200
high order to be better than Arnold

644
00:28:10,840 --> 00:28:16,080
Schwarzenegger or John Claude vanam uh

645
00:28:13,200 --> 00:28:19,519
if you're familiar with action movies um

646
00:28:16,080 --> 00:28:22,840
and so of course this gets a positive

647
00:28:19,519 --> 00:28:24,120
label and so uh we have run classifier

648
00:28:22,840 --> 00:28:25,240
actually maybe I should call this

649
00:28:24,120 --> 00:28:27,600
decision rule because this is

650
00:28:25,240 --> 00:28:29,120
essentially our decision Rule and here

651
00:28:27,600 --> 00:28:32,600
basically do the thing that I mentioned

652
00:28:29,120 --> 00:28:35,440
here the yes no obstain or in this case

653
00:28:32,600 --> 00:28:38,360
positive negative neutral so if the

654
00:28:35,440 --> 00:28:40,159
score is greater than zero we uh return

655
00:28:38,360 --> 00:28:42,480
one if the score is less than zero we

656
00:28:40,159 --> 00:28:44,679
return negative one which is negative

657
00:28:42,480 --> 00:28:47,240
and otherwise we returns

658
00:28:44,679 --> 00:28:48,760
zero um we have an accuracy calculation

659
00:28:47,240 --> 00:28:51,519
function just calculating the outputs

660
00:28:48,760 --> 00:28:55,840
are good and

661
00:28:51,519 --> 00:28:57,440
um this is uh the overall label count in

662
00:28:55,840 --> 00:28:59,919
the in the output so we can see there

663
00:28:57,440 --> 00:29:03,120
slightly more positives than there are

664
00:28:59,919 --> 00:29:06,080
negatives and then we can run this and

665
00:29:03,120 --> 00:29:10,200
we get a a score of

666
00:29:06,080 --> 00:29:14,760
43 and so one one thing that I have

667
00:29:10,200 --> 00:29:19,279
found um is I I do a lot of kind

668
00:29:14,760 --> 00:29:21,240
of research on how to make NLP systems

669
00:29:19,279 --> 00:29:23,600
better and one of the things I found

670
00:29:21,240 --> 00:29:26,679
really invaluable

671
00:29:23,600 --> 00:29:27,840
is if you're in a situation where you

672
00:29:26,679 --> 00:29:29,720
have a

673
00:29:27,840 --> 00:29:31,760
set task and you just want to make the

674
00:29:29,720 --> 00:29:33,760
system better on the set task doing

675
00:29:31,760 --> 00:29:35,159
comprehensive error analysis and

676
00:29:33,760 --> 00:29:37,320
understanding where your system is

677
00:29:35,159 --> 00:29:39,880
failing is one of the best ways to do

678
00:29:37,320 --> 00:29:42,200
that and I would like to do a very

679
00:29:39,880 --> 00:29:43,640
rudimentary version of this here and

680
00:29:42,200 --> 00:29:46,519
what I'm doing essentially is I'm just

681
00:29:43,640 --> 00:29:47,480
randomly picking uh several examples

682
00:29:46,519 --> 00:29:49,320
that were

683
00:29:47,480 --> 00:29:52,000
correct

684
00:29:49,320 --> 00:29:54,840
um and so like let let's look at the

685
00:29:52,000 --> 00:29:58,200
examples here um here the true label is

686
00:29:54,840 --> 00:30:00,760
zero um in this predicted one um it may

687
00:29:58,200 --> 00:30:03,440
not be as cutting as Woody or as true as

688
00:30:00,760 --> 00:30:05,039
back in the Glory Days of uh weekend and

689
00:30:03,440 --> 00:30:07,440
two or three things that I know about

690
00:30:05,039 --> 00:30:09,640
her but who else engaged in film Mak

691
00:30:07,440 --> 00:30:12,679
today is so cognizant of the cultural

692
00:30:09,640 --> 00:30:14,480
and moral issues involved in the process

693
00:30:12,679 --> 00:30:17,600
so what words in here are a good

694
00:30:14,480 --> 00:30:20,840
indication that this is a neutral

695
00:30:17,600 --> 00:30:20,840
sentence any

696
00:30:23,760 --> 00:30:28,399
ideas little bit tough

697
00:30:26,240 --> 00:30:30,919
huh starting to think maybe we should be

698
00:30:28,399 --> 00:30:30,919
using machine

699
00:30:31,480 --> 00:30:37,440
learning

700
00:30:34,080 --> 00:30:40,320
um even by the intentionally low

701
00:30:37,440 --> 00:30:41,559
standards of fratboy humor sority boys

702
00:30:40,320 --> 00:30:43,840
is a

703
00:30:41,559 --> 00:30:46,080
Bowser I think frat boy is maybe

704
00:30:43,840 --> 00:30:47,360
negative sentiment if you're familiar

705
00:30:46,080 --> 00:30:50,360
with

706
00:30:47,360 --> 00:30:51,960
us us I don't have any negative

707
00:30:50,360 --> 00:30:54,519
sentiment but the people who say it that

708
00:30:51,960 --> 00:30:55,960
way have negative senent maybe so if we

709
00:30:54,519 --> 00:31:01,080
wanted to go in and do that we could

710
00:30:55,960 --> 00:31:01,080
maybe I won't save this but

711
00:31:01,519 --> 00:31:08,919
uh

712
00:31:04,240 --> 00:31:11,840
um oh whoops I'll go back and fix it uh

713
00:31:08,919 --> 00:31:14,840
crass crass is pretty obviously negative

714
00:31:11,840 --> 00:31:14,840
right so I can add

715
00:31:17,039 --> 00:31:21,080
crass actually let me just add

716
00:31:21,760 --> 00:31:29,159
CR and then um I'll go back and have our

717
00:31:26,559 --> 00:31:29,159
train accurate

718
00:31:32,159 --> 00:31:36,240
wa maybe maybe I need to run the whole

719
00:31:33,960 --> 00:31:36,240
thing

720
00:31:36,960 --> 00:31:39,960
again

721
00:31:40,960 --> 00:31:45,880
and that budg the training accuracy a

722
00:31:43,679 --> 00:31:50,360
little um the dev test accuracy not very

723
00:31:45,880 --> 00:31:53,919
much so I could go through and do this

724
00:31:50,360 --> 00:31:53,919
um let me add

725
00:31:54,000 --> 00:31:58,320
unengaging so I could go through and do

726
00:31:56,000 --> 00:32:01,720
this all day and you probably be very

727
00:31:58,320 --> 00:32:01,720
bored on

728
00:32:04,240 --> 00:32:08,360
engage but I won't do that uh because we

729
00:32:06,919 --> 00:32:10,679
have much more important things to be

730
00:32:08,360 --> 00:32:14,679
doing

731
00:32:10,679 --> 00:32:16,440
um and uh so anyway we um we could go

732
00:32:14,679 --> 00:32:18,919
through and design all the features here

733
00:32:16,440 --> 00:32:21,279
but like why is this complicated like

734
00:32:18,919 --> 00:32:22,600
the the reason why it was complicated

735
00:32:21,279 --> 00:32:25,840
became pretty

736
00:32:22,600 --> 00:32:27,840
clear from the uh from the very

737
00:32:25,840 --> 00:32:29,639
beginning uh the very first example I

738
00:32:27,840 --> 00:32:32,200
showed you which was that was a really

739
00:32:29,639 --> 00:32:34,720
complicated sentence like all of us

740
00:32:32,200 --> 00:32:36,240
could see that it wasn't like really

741
00:32:34,720 --> 00:32:38,679
strongly positive it wasn't really

742
00:32:36,240 --> 00:32:40,519
strongly negative it was kind of like in

743
00:32:38,679 --> 00:32:42,919
the middle but it was in the middle and

744
00:32:40,519 --> 00:32:44,600
it said it in a very long way uh you

745
00:32:42,919 --> 00:32:46,120
know not using any clearly positive

746
00:32:44,600 --> 00:32:47,639
sentiment words not using any clearly

747
00:32:46,120 --> 00:32:49,760
negative sentiment

748
00:32:47,639 --> 00:32:53,760
words

749
00:32:49,760 --> 00:32:56,519
um so yeah basically I I

750
00:32:53,760 --> 00:33:00,559
improved um but what are the difficult

751
00:32:56,519 --> 00:33:03,720
cases uh that we saw here so the first

752
00:33:00,559 --> 00:33:07,639
one is low frequency

753
00:33:03,720 --> 00:33:09,760
words so um here's an example the action

754
00:33:07,639 --> 00:33:11,519
switches between past and present but

755
00:33:09,760 --> 00:33:13,120
the material link is too tenuous to

756
00:33:11,519 --> 00:33:16,840
Anchor the emotional connections at

757
00:33:13,120 --> 00:33:19,519
purport to span a 125 year divide so

758
00:33:16,840 --> 00:33:21,080
this is negative um tenuous is kind of a

759
00:33:19,519 --> 00:33:22,799
negative word purport is kind of a

760
00:33:21,080 --> 00:33:24,760
negative word but it doesn't appear very

761
00:33:22,799 --> 00:33:26,159
frequently so I would need to spend all

762
00:33:24,760 --> 00:33:29,720
my time looking for these words and

763
00:33:26,159 --> 00:33:32,480
trying to them in um here's yet another

764
00:33:29,720 --> 00:33:34,240
horse franchise mucking up its storyline

765
00:33:32,480 --> 00:33:36,639
with glitches casual fans could correct

766
00:33:34,240 --> 00:33:40,159
in their sleep negative

767
00:33:36,639 --> 00:33:42,600
again um so the solutions here are keep

768
00:33:40,159 --> 00:33:46,880
working until we get all of them which

769
00:33:42,600 --> 00:33:49,159
is maybe not super fun um or incorporate

770
00:33:46,880 --> 00:33:51,639
external resources such as sentiment

771
00:33:49,159 --> 00:33:52,880
dictionaries that people created uh we

772
00:33:51,639 --> 00:33:55,960
could do that but that's a lot of

773
00:33:52,880 --> 00:33:57,480
engineering effort to make something

774
00:33:55,960 --> 00:34:00,639
work

775
00:33:57,480 --> 00:34:03,720
um another one is conjugation so we saw

776
00:34:00,639 --> 00:34:06,600
unengaging I guess that's an example of

777
00:34:03,720 --> 00:34:08,359
conjugation uh some other ones are

778
00:34:06,600 --> 00:34:10,520
operatic sprawling picture that's

779
00:34:08,359 --> 00:34:12,040
entertainingly acted magnificently shot

780
00:34:10,520 --> 00:34:15,480
and gripping enough to sustain most of

781
00:34:12,040 --> 00:34:17,399
its 170 minute length so here we have

782
00:34:15,480 --> 00:34:19,079
magnificently so even if I added

783
00:34:17,399 --> 00:34:20,480
magnificent this wouldn't have been

784
00:34:19,079 --> 00:34:23,800
clocked

785
00:34:20,480 --> 00:34:26,599
right um it's basically an overlong

786
00:34:23,800 --> 00:34:28,839
episode of tales from the cryp so that's

787
00:34:26,599 --> 00:34:31,480
maybe another

788
00:34:28,839 --> 00:34:33,040
example um so some things that we could

789
00:34:31,480 --> 00:34:35,320
do or what we would have done before the

790
00:34:33,040 --> 00:34:37,720
modern Paradigm of machine learning is

791
00:34:35,320 --> 00:34:40,079
we would run some sort of normalizer

792
00:34:37,720 --> 00:34:42,800
like a stemmer or other things like this

793
00:34:40,079 --> 00:34:45,240
in order to convert this into uh the

794
00:34:42,800 --> 00:34:48,599
root wordss that we already have seen

795
00:34:45,240 --> 00:34:52,040
somewhere in our data or have already

796
00:34:48,599 --> 00:34:54,040
handed so that requires um conjugation

797
00:34:52,040 --> 00:34:55,879
analysis or morphological analysis as we

798
00:34:54,040 --> 00:34:57,400
say it in

799
00:34:55,879 --> 00:35:00,680
technicals

800
00:34:57,400 --> 00:35:03,960
negation this is a tricky one so this

801
00:35:00,680 --> 00:35:06,760
one's not nearly as Dreadful as expected

802
00:35:03,960 --> 00:35:08,800
so Dreadful is a pretty bad word right

803
00:35:06,760 --> 00:35:13,000
but not nearly as Dreadful as expected

804
00:35:08,800 --> 00:35:14,440
is like a solidly neutral um you know or

805
00:35:13,000 --> 00:35:16,359
maybe even

806
00:35:14,440 --> 00:35:18,920
positive I would I would say that's

807
00:35:16,359 --> 00:35:20,640
neutral but you know uh neutral or

808
00:35:18,920 --> 00:35:23,800
positive it's definitely not

809
00:35:20,640 --> 00:35:26,359
negative um serving s doesn't serve up a

810
00:35:23,800 --> 00:35:29,480
whole lot of laughs so laughs is

811
00:35:26,359 --> 00:35:31,880
obviously positive but not serving UPS

812
00:35:29,480 --> 00:35:34,440
is obviously

813
00:35:31,880 --> 00:35:36,839
negative so if negation modifies the

814
00:35:34,440 --> 00:35:38,240
word disregard it now we would probably

815
00:35:36,839 --> 00:35:41,440
need to do some sort of syntactic

816
00:35:38,240 --> 00:35:45,599
analysis or semantic analysis of

817
00:35:41,440 --> 00:35:47,520
some metaphor an analogy so puts a human

818
00:35:45,599 --> 00:35:50,640
face on a land most westerners are

819
00:35:47,520 --> 00:35:52,880
unfamiliar though uh this is

820
00:35:50,640 --> 00:35:54,960
positive green might want to hang on to

821
00:35:52,880 --> 00:35:58,800
that ski mask as robbery may be the only

822
00:35:54,960 --> 00:35:58,800
way to pay for this next project

823
00:35:58,839 --> 00:36:03,640
so this this is saying that the movie

824
00:36:01,960 --> 00:36:05,560
was so bad that the director will have

825
00:36:03,640 --> 00:36:08,359
to rob people in order to get money for

826
00:36:05,560 --> 00:36:11,000
the next project so that's kind of bad I

827
00:36:08,359 --> 00:36:12,880
guess um has all the depth of a waiting

828
00:36:11,000 --> 00:36:14,520
pool this is kind of my favorite one

829
00:36:12,880 --> 00:36:15,880
because it's really short and sweet but

830
00:36:14,520 --> 00:36:18,800
you know you need to know how deep a

831
00:36:15,880 --> 00:36:21,440
waiting pool is um so that's

832
00:36:18,800 --> 00:36:22,960
negative so the solution here I don't

833
00:36:21,440 --> 00:36:24,680
really even know how to handle this with

834
00:36:22,960 --> 00:36:26,880
a rule based system I have no idea how

835
00:36:24,680 --> 00:36:30,040
we would possibly do this yeah machine

836
00:36:26,880 --> 00:36:32,400
learning based models seem to be pretty

837
00:36:30,040 --> 00:36:37,000
adaptive okay and then I start doing

838
00:36:32,400 --> 00:36:37,000
these ones um anyone have a good

839
00:36:38,160 --> 00:36:46,800
idea any any other friends who know

840
00:36:42,520 --> 00:36:50,040
Japanese no okay um so yeah that's

841
00:36:46,800 --> 00:36:52,839
positive um that one's negative uh and

842
00:36:50,040 --> 00:36:54,920
the solution here is learn Japanese I

843
00:36:52,839 --> 00:36:56,800
guess or whatever other language you

844
00:36:54,920 --> 00:37:00,040
want to process so like obviously

845
00:36:56,800 --> 00:37:03,720
rule-based systems don't scale very

846
00:37:00,040 --> 00:37:05,119
well so um we've moved but like rule

847
00:37:03,720 --> 00:37:06,319
based systems don't scale very well

848
00:37:05,119 --> 00:37:08,160
we're not going to be using them for

849
00:37:06,319 --> 00:37:11,400
most of the things we do in this class

850
00:37:08,160 --> 00:37:14,240
but I do think it's sometimes useful to

851
00:37:11,400 --> 00:37:15,640
try to create one for your task maybe

852
00:37:14,240 --> 00:37:16,680
right at the very beginning of a project

853
00:37:15,640 --> 00:37:18,560
because it gives you an idea about

854
00:37:16,680 --> 00:37:21,160
what's really hard about the task in

855
00:37:18,560 --> 00:37:22,480
some cases so um yeah I wouldn't

856
00:37:21,160 --> 00:37:25,599
entirely discount them I'm not

857
00:37:22,480 --> 00:37:27,400
introducing them for no reason

858
00:37:25,599 --> 00:37:29,880
whatsoever

859
00:37:27,400 --> 00:37:34,160
so next is machine learning based anal

860
00:37:29,880 --> 00:37:35,400
and machine learning uh in general uh I

861
00:37:34,160 --> 00:37:36,640
here actually when I say machine

862
00:37:35,400 --> 00:37:38,160
learning I'm going to be talking about

863
00:37:36,640 --> 00:37:39,560
the traditional fine-tuning approach

864
00:37:38,160 --> 00:37:43,520
where we have a training set Dev set

865
00:37:39,560 --> 00:37:46,359
test set and so we take our training set

866
00:37:43,520 --> 00:37:49,680
we run some learning algorithm over it

867
00:37:46,359 --> 00:37:52,319
we have a learned feature extractor F A

868
00:37:49,680 --> 00:37:55,839
possibly learned feature extractor F

869
00:37:52,319 --> 00:37:57,880
possibly learned scoring function W and

870
00:37:55,839 --> 00:38:00,800
uh then we apply our inference algorithm

871
00:37:57,880 --> 00:38:02,839
our decision Rule and make decisions

872
00:38:00,800 --> 00:38:04,200
when I say possibly learned actually the

873
00:38:02,839 --> 00:38:06,119
first example I'm going to give of a

874
00:38:04,200 --> 00:38:07,760
machine learning based technique is uh

875
00:38:06,119 --> 00:38:10,079
doesn't have a learned feature extractor

876
00:38:07,760 --> 00:38:12,800
but most things that we use nowadays do

877
00:38:10,079 --> 00:38:12,800
have learned feature

878
00:38:13,200 --> 00:38:18,040
extractors so our first attempt is going

879
00:38:15,640 --> 00:38:21,760
to be a bag of words model uh and the

880
00:38:18,040 --> 00:38:27,119
way a bag of wordss model works is uh

881
00:38:21,760 --> 00:38:30,160
essentially we start out by looking up a

882
00:38:27,119 --> 00:38:33,240
Vector where one element in the vector

883
00:38:30,160 --> 00:38:36,240
is uh is one and all the other elements

884
00:38:33,240 --> 00:38:38,040
in the vector are zero and so if the

885
00:38:36,240 --> 00:38:40,319
word is different the position in the

886
00:38:38,040 --> 00:38:42,839
vector that's one will be different we

887
00:38:40,319 --> 00:38:46,280
add all of these together and this gives

888
00:38:42,839 --> 00:38:48,200
us a vector where each element is the

889
00:38:46,280 --> 00:38:50,359
frequency of that word in the vector and

890
00:38:48,200 --> 00:38:52,520
then we multiply that by weights and we

891
00:38:50,359 --> 00:38:55,520
get a

892
00:38:52,520 --> 00:38:57,160
score and um here as I said this is not

893
00:38:55,520 --> 00:39:00,359
a learned feature

894
00:38:57,160 --> 00:39:02,079
uh Vector this is basically uh sorry not

895
00:39:00,359 --> 00:39:04,359
a learn feature extractor this is

896
00:39:02,079 --> 00:39:06,200
basically a fixed feature extractor but

897
00:39:04,359 --> 00:39:09,839
the weights themselves are

898
00:39:06,200 --> 00:39:11,640
learned um so my my question is I

899
00:39:09,839 --> 00:39:14,599
mentioned a whole lot of problems before

900
00:39:11,640 --> 00:39:17,480
I mentioned infrequent words I mentioned

901
00:39:14,599 --> 00:39:20,760
conjugation I mentioned uh different

902
00:39:17,480 --> 00:39:22,880
languages I mentioned syntax and

903
00:39:20,760 --> 00:39:24,599
metaphor so which of these do we think

904
00:39:22,880 --> 00:39:25,440
would be fixed by this sort of learning

905
00:39:24,599 --> 00:39:27,400
based

906
00:39:25,440 --> 00:39:29,640
approach

907
00:39:27,400 --> 00:39:29,640
any

908
00:39:29,920 --> 00:39:35,200
ideas maybe not fixed maybe made

909
00:39:32,520 --> 00:39:35,200
significantly

910
00:39:36,880 --> 00:39:41,560
better any Brave uh brave

911
00:39:44,880 --> 00:39:48,440
people maybe maybe

912
00:39:53,720 --> 00:39:58,400
negation okay so maybe doesn't when it

913
00:39:55,760 --> 00:39:58,400
have a negative qu

914
00:40:02,960 --> 00:40:07,560
yeah yeah so for the conjugation if we

915
00:40:05,520 --> 00:40:09,200
had the conjugations of the stems mapped

916
00:40:07,560 --> 00:40:11,119
in the same position that might fix a

917
00:40:09,200 --> 00:40:12,920
conjugation problem but I would say if

918
00:40:11,119 --> 00:40:15,200
you don't do that then this kind of

919
00:40:12,920 --> 00:40:18,160
fixes conjugation a little bit but maybe

920
00:40:15,200 --> 00:40:21,319
not not really yeah kind of fix

921
00:40:18,160 --> 00:40:24,079
conjugation because like they're using

922
00:40:21,319 --> 00:40:26,760
the same there

923
00:40:24,079 --> 00:40:28,400
probably different variations so we

924
00:40:26,760 --> 00:40:31,359
learn how to

925
00:40:28,400 --> 00:40:33,400
classify surrounding

926
00:40:31,359 --> 00:40:35,000
structure yeah if it's a big enough

927
00:40:33,400 --> 00:40:36,760
training set you might have covered the

928
00:40:35,000 --> 00:40:37,880
various conjugations but if you haven't

929
00:40:36,760 --> 00:40:43,000
and you don't have any rule-based

930
00:40:37,880 --> 00:40:43,000
processing it it might still be problems

931
00:40:45,400 --> 00:40:50,359
yeah yeah so in frequent words if you

932
00:40:48,280 --> 00:40:52,560
have a large enough training set yeah

933
00:40:50,359 --> 00:40:54,599
you'll be able to fix it to some extent

934
00:40:52,560 --> 00:40:56,480
so none of the problems are entirely

935
00:40:54,599 --> 00:40:57,880
fixed but a lot of them are made better

936
00:40:56,480 --> 00:40:58,960
different languages is also made better

937
00:40:57,880 --> 00:41:00,119
if you have training data in that

938
00:40:58,960 --> 00:41:04,599
language but if you don't then you're

939
00:41:00,119 --> 00:41:06,240
out of BL so um so now what I'd like to

940
00:41:04,599 --> 00:41:10,800
do is I'd look to like to look at what

941
00:41:06,240 --> 00:41:15,079
our vectors represent so basically um in

942
00:41:10,800 --> 00:41:16,880
uh in binary classification each word um

943
00:41:15,079 --> 00:41:19,119
sorry so the vectors themselves

944
00:41:16,880 --> 00:41:21,880
represent the counts of the words here

945
00:41:19,119 --> 00:41:25,319
I'm talking about what the weight uh

946
00:41:21,880 --> 00:41:28,520
vectors or matrices correspond to and

947
00:41:25,319 --> 00:41:31,640
the weight uh Vector here will be

948
00:41:28,520 --> 00:41:33,680
positive if the word it tends to be

949
00:41:31,640 --> 00:41:36,680
positive if in a binary classification

950
00:41:33,680 --> 00:41:38,400
case in a multiclass classification case

951
00:41:36,680 --> 00:41:42,480
we'll actually have a matrix that looks

952
00:41:38,400 --> 00:41:45,480
like this where um each column or row uh

953
00:41:42,480 --> 00:41:47,079
corresponds to the word and each row or

954
00:41:45,480 --> 00:41:49,319
column corresponds to a label and it

955
00:41:47,079 --> 00:41:51,960
will be higher if that row tends to uh

956
00:41:49,319 --> 00:41:54,800
correlate with that uh that word tends

957
00:41:51,960 --> 00:41:56,920
to correlate that little

958
00:41:54,800 --> 00:41:59,240
bit so

959
00:41:56,920 --> 00:42:04,079
this um training of the bag of words

960
00:41:59,240 --> 00:42:07,720
model is can be done uh so simply that

961
00:42:04,079 --> 00:42:10,200
we uh can put it in a single slide so

962
00:42:07,720 --> 00:42:11,599
basically here uh what we do is we start

963
00:42:10,200 --> 00:42:14,760
out with the feature

964
00:42:11,599 --> 00:42:18,880
weights and for each example in our data

965
00:42:14,760 --> 00:42:20,800
set we extract features um the exact way

966
00:42:18,880 --> 00:42:23,920
I'm extracting features is basically

967
00:42:20,800 --> 00:42:25,720
splitting uh splitting the words using

968
00:42:23,920 --> 00:42:28,000
the python split function and then uh

969
00:42:25,720 --> 00:42:31,319
Counting number of times each word

970
00:42:28,000 --> 00:42:33,160
exists uh we then run the classifier so

971
00:42:31,319 --> 00:42:36,280
actually running the classifier is

972
00:42:33,160 --> 00:42:38,200
exactly the same as what we did for the

973
00:42:36,280 --> 00:42:42,640
uh the rule based system it's just that

974
00:42:38,200 --> 00:42:47,359
we have feature vectors instead and

975
00:42:42,640 --> 00:42:51,559
then if the predicted value is

976
00:42:47,359 --> 00:42:55,160
not value then for each of the

977
00:42:51,559 --> 00:42:56,680
features uh in the feature space we

978
00:42:55,160 --> 00:43:02,200
upweight

979
00:42:56,680 --> 00:43:03,599
the um we upweight The Weight by the

980
00:43:02,200 --> 00:43:06,000
vector

981
00:43:03,599 --> 00:43:09,920
size by or by the amount of the vector

982
00:43:06,000 --> 00:43:13,240
if Y is positive and we downweight the

983
00:43:09,920 --> 00:43:16,240
vector uh by the size of the vector if Y

984
00:43:13,240 --> 00:43:18,520
is negative so this is really really

985
00:43:16,240 --> 00:43:20,559
simple it's uh probably the simplest

986
00:43:18,520 --> 00:43:25,079
possible algorithm for training one of

987
00:43:20,559 --> 00:43:27,559
these models um but I have an

988
00:43:25,079 --> 00:43:30,040
example in this that you can also take a

989
00:43:27,559 --> 00:43:31,960
look at here's a trained bag of words

990
00:43:30,040 --> 00:43:33,680
classifier and we could step through

991
00:43:31,960 --> 00:43:34,960
this is on exactly the same data set as

992
00:43:33,680 --> 00:43:37,240
I did before we're training on the

993
00:43:34,960 --> 00:43:42,359
training set

994
00:43:37,240 --> 00:43:43,640
um and uh evaluating on the dev set um I

995
00:43:42,359 --> 00:43:45,880
also have some extra stuff like I'm

996
00:43:43,640 --> 00:43:47,079
Shuffling the order of the data IDs

997
00:43:45,880 --> 00:43:49,440
which is really important if you're

998
00:43:47,079 --> 00:43:53,160
doing this sort of incremental algorithm

999
00:43:49,440 --> 00:43:54,960
uh because uh what if what if your

1000
00:43:53,160 --> 00:43:57,400
creating data set was ordered in this

1001
00:43:54,960 --> 00:44:00,040
way where you have all of the positive

1002
00:43:57,400 --> 00:44:00,040
labels on

1003
00:44:00,359 --> 00:44:04,520
top and then you have all of the

1004
00:44:02,280 --> 00:44:06,680
negative labels on the

1005
00:44:04,520 --> 00:44:08,200
bottom if you do something like this it

1006
00:44:06,680 --> 00:44:10,200
would see only negative labels at the

1007
00:44:08,200 --> 00:44:11,800
end of training and you might have

1008
00:44:10,200 --> 00:44:14,400
problems because your model would only

1009
00:44:11,800 --> 00:44:17,440
predict negatives so we also Shuffle

1010
00:44:14,400 --> 00:44:20,319
data um and then step through we run the

1011
00:44:17,440 --> 00:44:22,559
classifier and I'm going to run uh five

1012
00:44:20,319 --> 00:44:23,640
epochs of training through the data set

1013
00:44:22,559 --> 00:44:27,160
uh very

1014
00:44:23,640 --> 00:44:29,599
fast and calculate our accuracy

1015
00:44:27,160 --> 00:44:33,280
and this got 75% accuracy on the

1016
00:44:29,599 --> 00:44:36,160
training data set and uh 56% accuracy on

1017
00:44:33,280 --> 00:44:40,000
the Deb data set so uh if you remember

1018
00:44:36,160 --> 00:44:41,520
our rule-based classifier had 42 uh 42

1019
00:44:40,000 --> 00:44:43,880
accuracy and now our training based

1020
00:44:41,520 --> 00:44:45,760
classifier has 56 accuracy but it's

1021
00:44:43,880 --> 00:44:49,359
overfitting heavily to the training side

1022
00:44:45,760 --> 00:44:50,880
so um basically this is a pretty strong

1023
00:44:49,359 --> 00:44:53,480
advertisement for why we should be using

1024
00:44:50,880 --> 00:44:54,960
machine learning you know I the amount

1025
00:44:53,480 --> 00:44:57,800
of code that we had for this machine

1026
00:44:54,960 --> 00:44:59,720
learning model is basically very similar

1027
00:44:57,800 --> 00:45:02,680
um it's not using any external libraries

1028
00:44:59,720 --> 00:45:02,680
but we're getting better at

1029
00:45:03,599 --> 00:45:08,800
this

1030
00:45:05,800 --> 00:45:08,800
cool

1031
00:45:09,559 --> 00:45:16,000
so cool any any questions

1032
00:45:13,520 --> 00:45:18,240
here and so I'm going to talk about the

1033
00:45:16,000 --> 00:45:20,760
connection to between this algorithm and

1034
00:45:18,240 --> 00:45:22,839
neural networks in the next class um

1035
00:45:20,760 --> 00:45:24,200
because this actually is using a very

1036
00:45:22,839 --> 00:45:26,319
similar training algorithm to what we

1037
00:45:24,200 --> 00:45:27,480
use in neural networks with some uh

1038
00:45:26,319 --> 00:45:30,079
particular

1039
00:45:27,480 --> 00:45:32,839
assumptions cool um so what's missing in

1040
00:45:30,079 --> 00:45:34,800
bag of words um still handling of

1041
00:45:32,839 --> 00:45:36,880
conjugation or compound words is not

1042
00:45:34,800 --> 00:45:39,160
perfect it we can do it to some extent

1043
00:45:36,880 --> 00:45:41,079
to the point where we can uh memorize

1044
00:45:39,160 --> 00:45:44,079
things so I love this movie I love this

1045
00:45:41,079 --> 00:45:46,920
movie another thing is handling word Ser

1046
00:45:44,079 --> 00:45:49,240
uh similarities so I love this movie and

1047
00:45:46,920 --> 00:45:50,720
I adore this movie uh these basically

1048
00:45:49,240 --> 00:45:52,119
mean the same thing as humans we know

1049
00:45:50,720 --> 00:45:54,200
they mean the same thing so we should be

1050
00:45:52,119 --> 00:45:56,079
able to take advantage of that fact to

1051
00:45:54,200 --> 00:45:57,839
learn better models but we're not doing

1052
00:45:56,079 --> 00:46:02,760
that in this model at the moment because

1053
00:45:57,839 --> 00:46:05,440
each unit is uh treated as a atomic unit

1054
00:46:02,760 --> 00:46:08,040
and there's no idea of

1055
00:46:05,440 --> 00:46:11,040
similarity also handling of combination

1056
00:46:08,040 --> 00:46:12,760
features so um I love this movie and I

1057
00:46:11,040 --> 00:46:14,920
don't love this movie I hate this movie

1058
00:46:12,760 --> 00:46:17,079
and I don't hate this movie actually

1059
00:46:14,920 --> 00:46:20,400
this is a little bit tricky because

1060
00:46:17,079 --> 00:46:23,240
negative words are slightly indicative

1061
00:46:20,400 --> 00:46:25,280
of it being negative but actually what

1062
00:46:23,240 --> 00:46:28,119
they do is they negate the other things

1063
00:46:25,280 --> 00:46:28,119
that you're saying in the

1064
00:46:28,240 --> 00:46:36,559
sentence

1065
00:46:30,720 --> 00:46:40,480
so um like love is positive hate is

1066
00:46:36,559 --> 00:46:40,480
negative but like don't

1067
00:46:50,359 --> 00:46:56,079
love it's actually kind of like this

1068
00:46:52,839 --> 00:46:59,359
right like um Love is very positive POS

1069
00:46:56,079 --> 00:47:01,760
hate is very negative but don't love is

1070
00:46:59,359 --> 00:47:04,680
like slightly less positive than don't

1071
00:47:01,760 --> 00:47:06,160
hate right so um It's actually kind of

1072
00:47:04,680 --> 00:47:07,559
tricky because you need to combine them

1073
00:47:06,160 --> 00:47:10,720
together and figure out what's going on

1074
00:47:07,559 --> 00:47:12,280
based on that another example that a lot

1075
00:47:10,720 --> 00:47:14,160
of people might not think of immediately

1076
00:47:12,280 --> 00:47:17,880
but is super super common in sentiment

1077
00:47:14,160 --> 00:47:20,160
analysis or any other thing is butt so

1078
00:47:17,880 --> 00:47:22,599
basically what but does is it throws

1079
00:47:20,160 --> 00:47:24,160
away all the stuff that you said before

1080
00:47:22,599 --> 00:47:26,119
um and you can just pay attention to the

1081
00:47:24,160 --> 00:47:29,000
stuff that you saw beforehand so like we

1082
00:47:26,119 --> 00:47:30,440
could even add this to our um like if

1083
00:47:29,000 --> 00:47:31,760
you want to add this to your rule based

1084
00:47:30,440 --> 00:47:33,240
classifier you can do that you just

1085
00:47:31,760 --> 00:47:34,640
search for butt and delete everything

1086
00:47:33,240 --> 00:47:37,240
before it and see if that inputs your

1087
00:47:34,640 --> 00:47:39,240
accuracy might be might be a fun very

1088
00:47:37,240 --> 00:47:43,480
quick thing

1089
00:47:39,240 --> 00:47:44,880
to cool so the better solution which is

1090
00:47:43,480 --> 00:47:46,800
what we're going to talk about for every

1091
00:47:44,880 --> 00:47:49,480
other class other than uh other than

1092
00:47:46,800 --> 00:47:52,160
this one is neural network models and

1093
00:47:49,480 --> 00:47:55,800
basically uh what they do is they do a

1094
00:47:52,160 --> 00:47:59,400
lookup of uh dense word embeddings so

1095
00:47:55,800 --> 00:48:02,520
instead of looking up uh individual uh

1096
00:47:59,400 --> 00:48:04,640
sparse uh vectors individual one hot

1097
00:48:02,520 --> 00:48:06,920
vectors they look up dense word

1098
00:48:04,640 --> 00:48:09,680
embeddings and then throw them into some

1099
00:48:06,920 --> 00:48:11,880
complicated function to extract features

1100
00:48:09,680 --> 00:48:16,359
and based on the features uh multiply by

1101
00:48:11,880 --> 00:48:18,280
weights and get a score um and if you're

1102
00:48:16,359 --> 00:48:20,359
doing text classification in the

1103
00:48:18,280 --> 00:48:22,520
traditional way this is normally what

1104
00:48:20,359 --> 00:48:23,760
you do um if you're doing text

1105
00:48:22,520 --> 00:48:25,960
classification with something like

1106
00:48:23,760 --> 00:48:27,280
prompting you're still actually doing

1107
00:48:25,960 --> 00:48:29,960
this because you're calculating the

1108
00:48:27,280 --> 00:48:32,960
score of the next word to predict and

1109
00:48:29,960 --> 00:48:34,720
that's done in exactly the same way so

1110
00:48:32,960 --> 00:48:37,760
uh even if you're using a large language

1111
00:48:34,720 --> 00:48:39,359
model like GPT this is still probably

1112
00:48:37,760 --> 00:48:41,800
happening under the hood unless open the

1113
00:48:39,359 --> 00:48:43,400
eye invented something that very

1114
00:48:41,800 --> 00:48:45,559
different in Alien than anything else

1115
00:48:43,400 --> 00:48:48,440
that we know of but I I'm guessing that

1116
00:48:45,559 --> 00:48:48,440
that propably hasn't

1117
00:48:48,480 --> 00:48:52,880
happen um one nice thing about neural

1118
00:48:50,880 --> 00:48:54,480
networks is neural networks

1119
00:48:52,880 --> 00:48:57,559
theoretically are powerful enough to

1120
00:48:54,480 --> 00:49:00,000
solve any task if you make them uh deep

1121
00:48:57,559 --> 00:49:01,160
enough or wide enough uh like if you

1122
00:49:00,000 --> 00:49:04,520
make them wide enough and then if you

1123
00:49:01,160 --> 00:49:06,799
make them deep it also helps further so

1124
00:49:04,520 --> 00:49:08,079
anytime somebody says well you can't

1125
00:49:06,799 --> 00:49:11,119
just solve that problem with neural

1126
00:49:08,079 --> 00:49:13,240
networks you know that they're lying

1127
00:49:11,119 --> 00:49:15,720
basically because they theoretically can

1128
00:49:13,240 --> 00:49:17,359
solve every problem uh but you have you

1129
00:49:15,720 --> 00:49:19,799
have issues of data you have issues of

1130
00:49:17,359 --> 00:49:23,079
other things like that so you know they

1131
00:49:19,799 --> 00:49:23,079
don't just necessarily work

1132
00:49:23,119 --> 00:49:28,040
outs cool um so the final thing I'd like

1133
00:49:26,400 --> 00:49:29,319
to talk about is the road map going

1134
00:49:28,040 --> 00:49:31,319
forward some of the things I'm going to

1135
00:49:29,319 --> 00:49:32,799
cover in the class and some of the

1136
00:49:31,319 --> 00:49:35,200
logistics

1137
00:49:32,799 --> 00:49:36,799
issues so um the first thing I'm going

1138
00:49:35,200 --> 00:49:38,240
to talk about in the class is language

1139
00:49:36,799 --> 00:49:40,559
modeling fun

1140
00:49:38,240 --> 00:49:42,720
fundamentals and uh so this could

1141
00:49:40,559 --> 00:49:44,240
include language models uh that just

1142
00:49:42,720 --> 00:49:46,559
predict the next words it could include

1143
00:49:44,240 --> 00:49:50,559
language models that predict the output

1144
00:49:46,559 --> 00:49:51,599
given the uh the input or the prompt um

1145
00:49:50,559 --> 00:49:54,559
I'm going to be talking about

1146
00:49:51,599 --> 00:49:56,520
representing words uh how how we get

1147
00:49:54,559 --> 00:49:59,319
word representation subword models other

1148
00:49:56,520 --> 00:50:01,440
things like that uh then go kind of

1149
00:49:59,319 --> 00:50:04,200
deeper into language modeling uh how do

1150
00:50:01,440 --> 00:50:07,799
we do it how do we evaluate it other

1151
00:50:04,200 --> 00:50:10,920
things um sequence encoding uh and this

1152
00:50:07,799 --> 00:50:13,240
is going to cover things like uh

1153
00:50:10,920 --> 00:50:16,280
Transformers uh self attention modals

1154
00:50:13,240 --> 00:50:18,559
but also very quickly cnns and rnns

1155
00:50:16,280 --> 00:50:20,880
which are useful in some

1156
00:50:18,559 --> 00:50:22,200
cases um and then we're going to

1157
00:50:20,880 --> 00:50:24,040
specifically go very deep into the

1158
00:50:22,200 --> 00:50:25,960
Transformer architecture and also talk a

1159
00:50:24,040 --> 00:50:27,280
little bit about some of the modern uh

1160
00:50:25,960 --> 00:50:30,240
improvements to the Transformer

1161
00:50:27,280 --> 00:50:31,839
architecture so the Transformer we're

1162
00:50:30,240 --> 00:50:33,839
using nowadays is very different than

1163
00:50:31,839 --> 00:50:36,200
the Transformer that was invented in

1164
00:50:33,839 --> 00:50:37,240
2017 uh so we're going to talk well I

1165
00:50:36,200 --> 00:50:38,760
wouldn't say very different but

1166
00:50:37,240 --> 00:50:41,359
different enough that it's important so

1167
00:50:38,760 --> 00:50:43,280
we're going to talk about some of those

1168
00:50:41,359 --> 00:50:45,079
things second thing I'd like to talk

1169
00:50:43,280 --> 00:50:47,000
about is training and inference methods

1170
00:50:45,079 --> 00:50:48,839
so this includes uh generation

1171
00:50:47,000 --> 00:50:52,119
algorithms uh so we're going to have a

1172
00:50:48,839 --> 00:50:55,520
whole class on how we generate text uh

1173
00:50:52,119 --> 00:50:58,319
in different ways uh prompting how uh we

1174
00:50:55,520 --> 00:50:59,720
can prompt things I hear uh world class

1175
00:50:58,319 --> 00:51:01,799
prompt engineers make a lot of money

1176
00:50:59,720 --> 00:51:05,480
nowadays so uh you'll want to pay

1177
00:51:01,799 --> 00:51:08,760
attention to that one um and instruction

1178
00:51:05,480 --> 00:51:11,520
tuning uh so how do we train models to

1179
00:51:08,760 --> 00:51:13,720
handle a lot of different tasks and

1180
00:51:11,520 --> 00:51:15,839
reinforcement learning so how do we uh

1181
00:51:13,720 --> 00:51:18,520
you know like actually generate outputs

1182
00:51:15,839 --> 00:51:19,839
uh kind of Judge them and then learn

1183
00:51:18,520 --> 00:51:22,599
from

1184
00:51:19,839 --> 00:51:25,880
there also experimental design and

1185
00:51:22,599 --> 00:51:28,079
evaluation so experimental design uh so

1186
00:51:25,880 --> 00:51:30,480
how do we design an experiment well uh

1187
00:51:28,079 --> 00:51:32,000
so that it backs up what we want to be

1188
00:51:30,480 --> 00:51:34,559
uh our conclusions that we want to be

1189
00:51:32,000 --> 00:51:37,000
backing up how do we do human annotation

1190
00:51:34,559 --> 00:51:38,880
of data in a reliable way this is

1191
00:51:37,000 --> 00:51:41,160
getting harder and harder as models get

1192
00:51:38,880 --> 00:51:43,359
better and better because uh getting

1193
00:51:41,160 --> 00:51:45,000
humans who don't care very much about

1194
00:51:43,359 --> 00:51:48,559
The annotation task they might do worse

1195
00:51:45,000 --> 00:51:51,119
than gp4 so um you need to be careful of

1196
00:51:48,559 --> 00:51:52,240
that also debugging and interpretation

1197
00:51:51,119 --> 00:51:53,960
technique so what are some of the

1198
00:51:52,240 --> 00:51:55,160
automatic techniques that you can do to

1199
00:51:53,960 --> 00:51:57,720
quickly figure out what's going wrong

1200
00:51:55,160 --> 00:52:00,040
with your models and improve

1201
00:51:57,720 --> 00:52:01,599
them and uh bias and fairness

1202
00:52:00,040 --> 00:52:04,200
considerations so it's really really

1203
00:52:01,599 --> 00:52:05,799
important nowadays uh that models are

1204
00:52:04,200 --> 00:52:07,880
being deployed to real people in the

1205
00:52:05,799 --> 00:52:09,880
real world and like actually causing

1206
00:52:07,880 --> 00:52:11,760
harm to people in some cases that we

1207
00:52:09,880 --> 00:52:15,160
need to be worried about

1208
00:52:11,760 --> 00:52:17,000
that Advanced Training in architectures

1209
00:52:15,160 --> 00:52:19,280
so we're going to talk about distill

1210
00:52:17,000 --> 00:52:21,400
distillation and quantization how can we

1211
00:52:19,280 --> 00:52:23,520
make small language models uh that

1212
00:52:21,400 --> 00:52:24,880
actually still work well like not large

1213
00:52:23,520 --> 00:52:27,559
you can run them on your phone you can

1214
00:52:24,880 --> 00:52:29,920
run them on your local

1215
00:52:27,559 --> 00:52:31,640
laptop um ensembling and mixtures of

1216
00:52:29,920 --> 00:52:33,480
experts how can we combine together

1217
00:52:31,640 --> 00:52:34,760
multiple models in order to create

1218
00:52:33,480 --> 00:52:35,880
models that are better than the sum of

1219
00:52:34,760 --> 00:52:38,799
their

1220
00:52:35,880 --> 00:52:40,720
parts and um retrieval and retrieval

1221
00:52:38,799 --> 00:52:43,920
augmented

1222
00:52:40,720 --> 00:52:45,480
generation long sequence models uh so

1223
00:52:43,920 --> 00:52:49,920
how do we handle long

1224
00:52:45,480 --> 00:52:52,240
outputs um and uh we're going to talk

1225
00:52:49,920 --> 00:52:55,760
about applications to complex reasoning

1226
00:52:52,240 --> 00:52:57,760
tasks code generation language agents

1227
00:52:55,760 --> 00:52:59,920
and knowledge-based QA and information

1228
00:52:57,760 --> 00:53:04,160
extraction I picked

1229
00:52:59,920 --> 00:53:06,760
these because they seem to be maybe the

1230
00:53:04,160 --> 00:53:09,880
most important at least in research

1231
00:53:06,760 --> 00:53:11,440
nowadays and also they cover uh the

1232
00:53:09,880 --> 00:53:13,640
things that when I talk to people in

1233
00:53:11,440 --> 00:53:15,280
Industry are kind of most interested in

1234
00:53:13,640 --> 00:53:17,559
so hopefully it'll be useful regardless

1235
00:53:15,280 --> 00:53:19,799
of uh whether you plan on doing research

1236
00:53:17,559 --> 00:53:22,839
or or plan on doing industry related

1237
00:53:19,799 --> 00:53:24,160
things uh by by the way the two things

1238
00:53:22,839 --> 00:53:25,920
that when I talk to people in Industry

1239
00:53:24,160 --> 00:53:29,599
they're most interested in are Rag and

1240
00:53:25,920 --> 00:53:31,079
code generation at the moment for now um

1241
00:53:29,599 --> 00:53:32,319
so those are ones that you'll want to

1242
00:53:31,079 --> 00:53:34,680
pay attention

1243
00:53:32,319 --> 00:53:36,599
to and then finally we have a few

1244
00:53:34,680 --> 00:53:40,079
lectures on Linguistics and

1245
00:53:36,599 --> 00:53:42,720
multilinguality um I love Linguistics

1246
00:53:40,079 --> 00:53:44,839
but uh to be honest at the moment most

1247
00:53:42,720 --> 00:53:47,760
of our Cutting Edge models don't

1248
00:53:44,839 --> 00:53:49,240
explicitly use linguistic structure um

1249
00:53:47,760 --> 00:53:50,799
but I still think it's useful to know

1250
00:53:49,240 --> 00:53:52,760
about it especially if you're working on

1251
00:53:50,799 --> 00:53:54,880
multilingual things especially if you're

1252
00:53:52,760 --> 00:53:57,040
interested in very robust generalization

1253
00:53:54,880 --> 00:53:58,920
to new models so we're going to talk a

1254
00:53:57,040 --> 00:54:02,599
little bit about that and also

1255
00:53:58,920 --> 00:54:06,079
multilingual LP I'm going to have

1256
00:54:02,599 --> 00:54:09,119
fure so also if you have any suggestions

1257
00:54:06,079 --> 00:54:11,400
um we have two guest lecture slots still

1258
00:54:09,119 --> 00:54:12,799
open uh that I'm trying to fill so if

1259
00:54:11,400 --> 00:54:15,440
you have any things that you really want

1260
00:54:12,799 --> 00:54:16,440
to hear about um I could either add them

1261
00:54:15,440 --> 00:54:19,319
to the

1262
00:54:16,440 --> 00:54:21,079
existing you know content or I could

1263
00:54:19,319 --> 00:54:23,240
invite a guest lecturer who's working on

1264
00:54:21,079 --> 00:54:24,079
that topic so you know please feel free

1265
00:54:23,240 --> 00:54:26,760
to tell

1266
00:54:24,079 --> 00:54:29,160
me um then the class format and

1267
00:54:26,760 --> 00:54:32,280
structure uh the class

1268
00:54:29,160 --> 00:54:34,000
content my goal is to learn in detail

1269
00:54:32,280 --> 00:54:36,640
about building NLP systems from a

1270
00:54:34,000 --> 00:54:40,520
research perspective so this is a 700

1271
00:54:36,640 --> 00:54:43,599
level course so it's aiming to be for

1272
00:54:40,520 --> 00:54:46,960
people who really want to try new and

1273
00:54:43,599 --> 00:54:49,280
Innovative things in uh kind of natural

1274
00:54:46,960 --> 00:54:51,359
language processing it's not going to

1275
00:54:49,280 --> 00:54:52,760
focus solely on reimplementing things

1276
00:54:51,359 --> 00:54:54,319
that have been done before including in

1277
00:54:52,760 --> 00:54:55,280
the project I'm going to be expecting

1278
00:54:54,319 --> 00:54:58,480
everybody to do something something

1279
00:54:55,280 --> 00:54:59,920
that's kind of new whether it's coming

1280
00:54:58,480 --> 00:55:01,359
up with a new method or applying

1281
00:54:59,920 --> 00:55:03,559
existing methods to a place where they

1282
00:55:01,359 --> 00:55:05,079
haven't been used before or building out

1283
00:55:03,559 --> 00:55:06,640
things for a new language or something

1284
00:55:05,079 --> 00:55:08,359
like that so that's kind of one of the

1285
00:55:06,640 --> 00:55:11,480
major goals of this

1286
00:55:08,359 --> 00:55:13,000
class um learn basic and advanced topics

1287
00:55:11,480 --> 00:55:15,559
in machine learning approaches to NLP

1288
00:55:13,000 --> 00:55:18,359
and language models learn some basic

1289
00:55:15,559 --> 00:55:21,480
linguistic knowledge useful in NLP uh

1290
00:55:18,359 --> 00:55:23,200
see case studies of NLP applications and

1291
00:55:21,480 --> 00:55:25,680
learn how to identify unique problems

1292
00:55:23,200 --> 00:55:29,039
for each um one thing i' like to point

1293
00:55:25,680 --> 00:55:31,160
out is I'm not going to cover every NLP

1294
00:55:29,039 --> 00:55:32,920
application ever because that would be

1295
00:55:31,160 --> 00:55:35,520
absolutely impossible NLP is being used

1296
00:55:32,920 --> 00:55:37,079
in so many different areas nowadays but

1297
00:55:35,520 --> 00:55:38,960
what I want people to pay attention to

1298
00:55:37,079 --> 00:55:41,280
like even if you're not super interested

1299
00:55:38,960 --> 00:55:42,400
in code generation for example what you

1300
00:55:41,280 --> 00:55:44,200
can do is you can look at code

1301
00:55:42,400 --> 00:55:46,160
generation look at how people identify

1302
00:55:44,200 --> 00:55:47,680
problems look at the methods that people

1303
00:55:46,160 --> 00:55:50,880
have proposed to solve those unique

1304
00:55:47,680 --> 00:55:53,039
problems and then kind of map that try

1305
00:55:50,880 --> 00:55:54,799
to do some generalization onto your own

1306
00:55:53,039 --> 00:55:57,799
problems of Interest so uh that's kind

1307
00:55:54,799 --> 00:56:00,280
of the goal of the NLP

1308
00:55:57,799 --> 00:56:02,440
applications finally uh learning how to

1309
00:56:00,280 --> 00:56:05,160
debug when and where NLP systems fail

1310
00:56:02,440 --> 00:56:08,200
and build improvements based on this so

1311
00:56:05,160 --> 00:56:10,200
um ever since I was a graduate student

1312
00:56:08,200 --> 00:56:12,720
this has been like one of the really

1313
00:56:10,200 --> 00:56:15,920
important things that I feel like I've

1314
00:56:12,720 --> 00:56:17,440
done well or done better than some other

1315
00:56:15,920 --> 00:56:19,280
people and I I feel like it's a really

1316
00:56:17,440 --> 00:56:21,119
good way to like even if you're only

1317
00:56:19,280 --> 00:56:22,680
interested in improving accuracy knowing

1318
00:56:21,119 --> 00:56:25,039
why your system's failing still is the

1319
00:56:22,680 --> 00:56:27,599
best way to do that I so I'm going to

1320
00:56:25,039 --> 00:56:30,559
put a lot of emphasis on

1321
00:56:27,599 --> 00:56:32,559
that in terms of the class format um

1322
00:56:30,559 --> 00:56:36,280
before class for some classes there are

1323
00:56:32,559 --> 00:56:37,880
recommended reading uh this can be

1324
00:56:36,280 --> 00:56:39,559
helpful to read I'm never going to

1325
00:56:37,880 --> 00:56:41,119
expect you to definitely have read it

1326
00:56:39,559 --> 00:56:42,480
before the class but I would suggest

1327
00:56:41,119 --> 00:56:45,160
that maybe you'll get more out of the

1328
00:56:42,480 --> 00:56:47,319
class if you do that um during class

1329
00:56:45,160 --> 00:56:48,079
we'll have the lecture um in discussion

1330
00:56:47,319 --> 00:56:50,559
with

1331
00:56:48,079 --> 00:56:52,359
everybody um sometimes we'll have a code

1332
00:56:50,559 --> 00:56:55,839
or data walk

1333
00:56:52,359 --> 00:56:58,760
um actually this is a a little bit old I

1334
00:56:55,839 --> 00:57:01,880
I have this slide we're this year we're

1335
00:56:58,760 --> 00:57:04,160
going to be adding more uh code and data

1336
00:57:01,880 --> 00:57:07,400
walks during office hours and the way it

1337
00:57:04,160 --> 00:57:09,400
will work is one of the Tas we have

1338
00:57:07,400 --> 00:57:11,160
seven Tas who I'm going to introduce

1339
00:57:09,400 --> 00:57:15,000
very soon but one of the Tas will be

1340
00:57:11,160 --> 00:57:16,839
doing this kind of recitation where you

1341
00:57:15,000 --> 00:57:18,200
um where we go over a library so if

1342
00:57:16,839 --> 00:57:19,480
you're not familiar with the library and

1343
00:57:18,200 --> 00:57:21,960
you want to be more familiar with the

1344
00:57:19,480 --> 00:57:23,720
library you can join this and uh then

1345
00:57:21,960 --> 00:57:25,400
we'll be able to do this and this will

1346
00:57:23,720 --> 00:57:28,240
cover things like

1347
00:57:25,400 --> 00:57:31,039
um pie torch and sentence piece uh we're

1348
00:57:28,240 --> 00:57:33,280
going to start out with hugging face um

1349
00:57:31,039 --> 00:57:36,559
inference stuff like

1350
00:57:33,280 --> 00:57:41,520
VM uh debugging software like

1351
00:57:36,559 --> 00:57:41,520
Xeno um what were the other

1352
00:57:41,960 --> 00:57:47,200
ones oh the open AI API and light llm

1353
00:57:45,680 --> 00:57:50,520
other stuff like that so we we have lots

1354
00:57:47,200 --> 00:57:53,599
of them planned we'll uh uh we'll update

1355
00:57:50,520 --> 00:57:54,839
that um and then after class after

1356
00:57:53,599 --> 00:57:58,079
almost every class we'll have a question

1357
00:57:54,839 --> 00:58:00,079
quiz um and the quiz is intended to just

1358
00:57:58,079 --> 00:58:02,000
you know make sure that you uh paid

1359
00:58:00,079 --> 00:58:04,480
attention to the material and are able

1360
00:58:02,000 --> 00:58:07,520
to answer questions about it we will aim

1361
00:58:04,480 --> 00:58:09,559
to release it on the day of the course

1362
00:58:07,520 --> 00:58:11,599
the day of the actual lecture and it

1363
00:58:09,559 --> 00:58:14,559
will be due at the end of the following

1364
00:58:11,599 --> 00:58:15,960
day of the lecture so um it will be

1365
00:58:14,559 --> 00:58:18,920
three questions it probably shouldn't

1366
00:58:15,960 --> 00:58:20,680
take a whole lot of time but um uh yeah

1367
00:58:18,920 --> 00:58:23,400
so we'll H

1368
00:58:20,680 --> 00:58:26,319
that in terms of assignments assignment

1369
00:58:23,400 --> 00:58:28,640
one is going to be build your own llama

1370
00:58:26,319 --> 00:58:30,200
and so what this is going to look like

1371
00:58:28,640 --> 00:58:32,680
is we're going to give you a partial

1372
00:58:30,200 --> 00:58:34,319
implementation of llama which is kind of

1373
00:58:32,680 --> 00:58:37,960
the most popular open source language

1374
00:58:34,319 --> 00:58:40,160
model nowadays and ask you to fill in um

1375
00:58:37,960 --> 00:58:42,839
ask you to fill in the parts we're going

1376
00:58:40,160 --> 00:58:45,920
to train a very small version of llama

1377
00:58:42,839 --> 00:58:47,319
on a small data set and get it to work

1378
00:58:45,920 --> 00:58:48,880
and the reason why it's very small is

1379
00:58:47,319 --> 00:58:50,480
because the smallest actual version of

1380
00:58:48,880 --> 00:58:53,039
llama is 7 billion

1381
00:58:50,480 --> 00:58:55,359
parameters um and that might be a little

1382
00:58:53,039 --> 00:58:58,400
bit difficult to train with

1383
00:58:55,359 --> 00:59:00,680
resources um for assignment two we're

1384
00:58:58,400 --> 00:59:04,559
going to try to do an NLP task from

1385
00:59:00,680 --> 00:59:06,920
scratch and so the way this will work is

1386
00:59:04,559 --> 00:59:08,520
we're going to give you an assignment

1387
00:59:06,920 --> 00:59:10,880
which we're not going to give you an

1388
00:59:08,520 --> 00:59:13,400
actual data set and instead we're going

1389
00:59:10,880 --> 00:59:15,760
to ask you to uh perform data creation

1390
00:59:13,400 --> 00:59:19,359
modeling and evaluation for a specified

1391
00:59:15,760 --> 00:59:20,640
task and so we're going to tell you uh

1392
00:59:19,359 --> 00:59:22,599
what to do but we're not going to tell

1393
00:59:20,640 --> 00:59:26,400
you exactly how to do it but we're going

1394
00:59:22,599 --> 00:59:29,680
to try to give as conrete directions as

1395
00:59:26,400 --> 00:59:32,359
we can um

1396
00:59:29,680 --> 00:59:34,160
yeah will you be given a parameter limit

1397
00:59:32,359 --> 00:59:36,559
on the model so that's a good question

1398
00:59:34,160 --> 00:59:39,119
or like a expense limit or something

1399
00:59:36,559 --> 00:59:40,440
like that um I maybe actually I should

1400
00:59:39,119 --> 00:59:44,240
take a break from the assignments and

1401
00:59:40,440 --> 00:59:46,520
talk about compute so right now um for

1402
00:59:44,240 --> 00:59:49,319
assignment one we're planning on having

1403
00:59:46,520 --> 00:59:51,599
this be able to be done either on a Mac

1404
00:59:49,319 --> 00:59:53,520
laptop with an M1 or M2 processor which

1405
00:59:51,599 --> 00:59:57,079
I think a lot of people have or Google

1406
00:59:53,520 --> 00:59:59,839
collab um so it should be like

1407
00:59:57,079 --> 01:00:02,160
sufficient to use free computational

1408
00:59:59,839 --> 01:00:03,640
resources that you have for number two

1409
01:00:02,160 --> 01:00:06,079
we'll think about that I think that's

1410
01:00:03,640 --> 01:00:08,280
important we do have Google cloud

1411
01:00:06,079 --> 01:00:11,520
credits for $50 for everybody and I'm

1412
01:00:08,280 --> 01:00:13,440
working to get AWS credits for more um

1413
01:00:11,520 --> 01:00:18,160
but the cloud providers nowadays are

1414
01:00:13,440 --> 01:00:19,680
being very stingy so um so it's uh been

1415
01:00:18,160 --> 01:00:22,160
a little bit of a fight to get uh

1416
01:00:19,680 --> 01:00:23,680
credits but I I it is very important so

1417
01:00:22,160 --> 01:00:28,480
I'm going to try to get as as many as we

1418
01:00:23,680 --> 01:00:31,119
can um and so yeah I I think basically

1419
01:00:28,480 --> 01:00:32,280
uh there will be some sort of like limit

1420
01:00:31,119 --> 01:00:34,480
on the amount of things you can

1421
01:00:32,280 --> 01:00:36,240
practically do and so because of that

1422
01:00:34,480 --> 01:00:39,920
I'm hoping that people will rely very

1423
01:00:36,240 --> 01:00:43,359
heavily on pre-trained models um or uh

1424
01:00:39,920 --> 01:00:46,079
yeah pre-trained models

1425
01:00:43,359 --> 01:00:49,599
and yeah so that that's the the short

1426
01:00:46,079 --> 01:00:52,799
story B um the second thing uh the

1427
01:00:49,599 --> 01:00:54,720
assignment three is to do a survey of

1428
01:00:52,799 --> 01:00:57,920
some sort of state-ofthe-art research

1429
01:00:54,720 --> 01:01:00,760
resarch and do a reimplementation of

1430
01:00:57,920 --> 01:01:02,000
this and in doing this again you will

1431
01:01:00,760 --> 01:01:03,440
have to think about something that's

1432
01:01:02,000 --> 01:01:06,359
feasible within computational

1433
01:01:03,440 --> 01:01:08,680
constraints um and so you can discuss

1434
01:01:06,359 --> 01:01:11,839
with your Tas about uh about the best

1435
01:01:08,680 --> 01:01:13,920
way to do this um and then the final

1436
01:01:11,839 --> 01:01:15,400
project is to perform a unique project

1437
01:01:13,920 --> 01:01:17,559
that either improves on the state-of-the

1438
01:01:15,400 --> 01:01:21,000
art with respect to whatever you would

1439
01:01:17,559 --> 01:01:23,440
like to improve with this could be uh

1440
01:01:21,000 --> 01:01:25,280
accuracy for sure this could be

1441
01:01:23,440 --> 01:01:27,760
efficiency

1442
01:01:25,280 --> 01:01:29,599
it could be some sense of

1443
01:01:27,760 --> 01:01:31,520
interpretability but if it's going to be

1444
01:01:29,599 --> 01:01:33,599
something like interpretability you'll

1445
01:01:31,520 --> 01:01:35,440
have to discuss with us what that means

1446
01:01:33,599 --> 01:01:37,240
like how we measure that how we can like

1447
01:01:35,440 --> 01:01:40,839
actually say that you did a good job

1448
01:01:37,240 --> 01:01:42,839
with improving that um another thing

1449
01:01:40,839 --> 01:01:44,680
that you can do is take whatever you

1450
01:01:42,839 --> 01:01:47,280
implemented for assignment 3 and apply

1451
01:01:44,680 --> 01:01:49,039
it to a new task or apply it to a new

1452
01:01:47,280 --> 01:01:50,760
language that has never been examined

1453
01:01:49,039 --> 01:01:53,119
before so these are also acceptable

1454
01:01:50,760 --> 01:01:54,240
final projects but basically the idea is

1455
01:01:53,119 --> 01:01:55,559
for the final project you need to do

1456
01:01:54,240 --> 01:01:57,480
something something new that hasn't been

1457
01:01:55,559 --> 01:01:59,880
done before and create new knowledge

1458
01:01:57,480 --> 01:02:04,520
with the respect

1459
01:01:59,880 --> 01:02:07,640
toy um so for this the instructor is me

1460
01:02:04,520 --> 01:02:09,920
um I'm uh looking forward to you know

1461
01:02:07,640 --> 01:02:13,599
discussing and working with all of you

1462
01:02:09,920 --> 01:02:16,119
um for TAS we have seven Tas uh two of

1463
01:02:13,599 --> 01:02:18,319
them are in transit so they're not here

1464
01:02:16,119 --> 01:02:22,279
today um the other ones uh Tas would you

1465
01:02:18,319 --> 01:02:22,279
mind coming up uh to introduce

1466
01:02:23,359 --> 01:02:26,359
yourself

1467
01:02:28,400 --> 01:02:32,839
so um yeah nhir and akshai couldn't be

1468
01:02:31,599 --> 01:02:34,039
here today because they're traveling

1469
01:02:32,839 --> 01:02:37,119
I'll introduce them later because

1470
01:02:34,039 --> 01:02:37,119
they're coming uh next

1471
01:02:40,359 --> 01:02:46,480
time cool and what I'd like everybody to

1472
01:02:43,000 --> 01:02:48,680
do is say um like you know what your

1473
01:02:46,480 --> 01:02:53,079
name is uh what

1474
01:02:48,680 --> 01:02:55,799
your like maybe what you're interested

1475
01:02:53,079 --> 01:02:57,319
in um and the reason the goal of this is

1476
01:02:55,799 --> 01:02:59,200
number one for everybody to know who you

1477
01:02:57,319 --> 01:03:00,720
are and number two for everybody to know

1478
01:02:59,200 --> 01:03:03,440
who the best person to talk to is if

1479
01:03:00,720 --> 01:03:03,440
they're interested in

1480
01:03:04,200 --> 01:03:09,079
particular hi uh I'm

1481
01:03:07,000 --> 01:03:15,520
Aila second

1482
01:03:09,079 --> 01:03:15,520
year I work on language and social

1483
01:03:16,200 --> 01:03:24,559
and I'm I'm a second this year PhD

1484
01:03:21,160 --> 01:03:26,799
student Grand and Shar with you I search

1485
01:03:24,559 --> 01:03:28,480
is like started in the border of MP and

1486
01:03:26,799 --> 01:03:31,000
computer interaction with a lot of work

1487
01:03:28,480 --> 01:03:32,640
on automating parts of the developer

1488
01:03:31,000 --> 01:03:35,319
experience to make it easier for anyone

1489
01:03:32,640 --> 01:03:35,319
to

1490
01:03:39,090 --> 01:03:42,179
[Music]

1491
01:03:47,520 --> 01:03:53,279
orif

1492
01:03:50,079 --> 01:03:54,680
everyone first

1493
01:03:53,279 --> 01:03:57,119
year

1494
01:03:54,680 --> 01:04:00,119
[Music]

1495
01:03:57,119 --> 01:04:03,559
I don't like updating primar models I

1496
01:04:00,119 --> 01:04:03,559
hope to not update Prim

1497
01:04:14,599 --> 01:04:19,400
modelm yeah thanks a lot everyone and

1498
01:04:17,200 --> 01:04:19,400
yeah

1499
01:04:20,839 --> 01:04:29,400
than and so we will um we'll have people

1500
01:04:25,640 --> 01:04:30,799
uh kind of have office hours uh every ta

1501
01:04:29,400 --> 01:04:32,880
has office hours at a regular time

1502
01:04:30,799 --> 01:04:34,480
during the week uh please feel free to

1503
01:04:32,880 --> 01:04:38,400
come to their office hours or my office

1504
01:04:34,480 --> 01:04:41,960
hours um I think they are visha are they

1505
01:04:38,400 --> 01:04:43,880
posted on the site or okay yeah they

1506
01:04:41,960 --> 01:04:47,240
they either are or will be posted on the

1507
01:04:43,880 --> 01:04:49,720
site very soon um and come by to talk

1508
01:04:47,240 --> 01:04:51,480
about anything uh if there's nobody in

1509
01:04:49,720 --> 01:04:53,079
my office hours I'm happy to talk about

1510
01:04:51,480 --> 01:04:54,599
things that are unrelated but if there's

1511
01:04:53,079 --> 01:04:58,039
lots of people waiting outside or I

1512
01:04:54,599 --> 01:05:00,319
might limit it to uh like um just things

1513
01:04:58,039 --> 01:05:02,480
about the class so cool and we have

1514
01:05:00,319 --> 01:05:04,760
Patza we'll be checking that regularly

1515
01:05:02,480 --> 01:05:06,839
uh striving to get you an answer in 24

1516
01:05:04,760 --> 01:05:12,240
hours on weekdays over weekends we might

1517
01:05:06,839 --> 01:05:16,000
not so um yeah so that's all for today

1518
01:05:12,240 --> 01:05:16,000
are there any questions