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const { zodToJsonSchema } = require('zod-to-json-schema');
const { PromptTemplate } = require('langchain/prompts');
const { JsonKeyOutputFunctionsParser } = require('langchain/output_parsers');
const { LLMChain } = require('langchain/chains');
function getExtractionFunctions(schema) {
return [
{
name: 'information_extraction',
description: 'Extracts the relevant information from the passage.',
parameters: {
type: 'object',
properties: {
info: {
type: 'array',
items: {
type: schema.type,
properties: schema.properties,
required: schema.required,
},
},
},
required: ['info'],
},
},
];
}
const _EXTRACTION_TEMPLATE = `Extract and save the relevant entities mentioned in the following passage together with their properties.
Passage:
{input}
`;
function createExtractionChain(schema, llm, options = {}) {
const { prompt = PromptTemplate.fromTemplate(_EXTRACTION_TEMPLATE), ...rest } = options;
const functions = getExtractionFunctions(schema);
const outputParser = new JsonKeyOutputFunctionsParser({ attrName: 'info' });
return new LLMChain({
llm,
prompt,
llmKwargs: { functions },
outputParser,
tags: ['openai_functions', 'extraction'],
...rest,
});
}
function createExtractionChainFromZod(schema, llm) {
return createExtractionChain(zodToJsonSchema(schema), llm);
}
module.exports = {
createExtractionChain,
createExtractionChainFromZod,
};
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