app.py

import spaces
import torch
import gradio
import json
import onnxruntime
import time
from datetime import datetime
from transformers import pipeline
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

# CORS Config - This isn't actually working; instead, I am taking a gross approach to origin whitelisting within the service.
app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://statosphere-3704059fdd7e.c5v4v4jx6pq5.win","https://crunchatize-77a78ffcc6a6.c5v4v4jx6pq5.win","https://crunchatize-2-2b4f5b1479a6.c5v4v4jx6pq5.win","https://tamabotchi-2dba63df3bf1.c5v4v4jx6pq5.win"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

print(f"Is CUDA available: {torch.cuda.is_available()}")
if torch.cuda.is_available():
    print(f"CUDA device: {torch.cuda.get_device_name(torch.cuda.current_device())}")

model_name = "MoritzLaurer/roberta-large-zeroshot-v2.0-c"
tokenizer_name = "MoritzLaurer/roberta-large-zeroshot-v2.0-c"

classifier_cpu = pipeline(task="zero-shot-classification", model=model_name, tokenizer=tokenizer_name)
classifier_gpu = pipeline(task="zero-shot-classification", model=model_name, tokenizer=tokenizer_name, device="cuda:0") if torch.cuda.is_available() else classifier_cpu

def classify(data_string, request: gradio.Request):
    if request:
        if request.headers["origin"] not in ["https://statosphere-3704059fdd7e.c5v4v4jx6pq5.win", "https://crunchatize-77a78ffcc6a6.c5v4v4jx6pq5.win", "https://crunchatize-2-2b4f5b1479a6.c5v4v4jx6pq5.win", "https://tamabotchi-2dba63df3bf1.c5v4v4jx6pq5.win", "https://ravenok-statosphere-backend.hf.space", "https://lord-raven.github.io"]:
            return "{}"
    data = json.loads(data_string)

    # Try to prevent batch suggestion warning in log.
    classifier_cpu.call_count = 0
    classifier_gpu.call_count = 0

    start_time = time.time()
    result = {}
    try:
        if 'cpu' not in data:
            result = zero_shot_classification_gpu(data)
            print(f"{datetime.now().strftime('%Y-%m-%d %H:%M:%S')} - GPU Classification took {time.time() - start_time}.")
    except Exception as e:
        print(f"GPU classification failed: {e}\nFall back to CPU.")
    if not result:
        result = zero_shot_classification_cpu(data)
        print(f"{datetime.now().strftime('%Y-%m-%d %H:%M:%S')} - CPU Classification took {time.time() - start_time}.")
    return json.dumps(result)

def zero_shot_classification_cpu(data):
    return classifier_cpu(data['sequence'], candidate_labels=data['candidate_labels'], hypothesis_template=data['hypothesis_template'], multi_label=data['multi_label'])

@spaces.GPU(duration=3)
def zero_shot_classification_gpu(data):
    return classifier_gpu(data['sequence'], candidate_labels=data['candidate_labels'], hypothesis_template=data['hypothesis_template'], multi_label=data['multi_label'])

def create_sequences(data):
    return [data['sequence'] + '\n' + data['hypothesis_template'].format(label) for label in data['candidate_labels']]

gradio_interface = gradio.Interface(
    fn = classify,
    inputs = gradio.Textbox(label="JSON Input"),
    outputs = gradio.Textbox(label="JSON Output"),
    title = "Statosphere Backend",
    description = "This Space is a classification service for a set of chub.ai stages and not really intended for use through this UI."
)

app.mount("/gradio", gradio_interface)

gradio_interface.launch()