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Browse files- app/main.py +0 -67
app/main.py
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from fastapi import FastAPI, HTTPException
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from pydantic import BaseModel
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from transformers import AutoModelForCausalLM, AutoTokenizer, pipeline
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from peft import PeftModel, PeftConfig
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from fastapi.middleware.cors import CORSMiddleware
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import torch
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from huggingface_hub import login
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from dotenv import load_dotenv
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import os
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load_dotenv()
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hf_token = os.getenv("HF_TOKEN")
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login(token=hf_token)
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app = FastAPI()
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# Allow frontend communication
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["http://localhost:3000"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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# === Load Base + Adapter ===
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adapter_path = "C:/Users/nimes/Desktop/NLP Projects/Multi-label Email Classifier/checkpoint-711"
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try:
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# Load PEFT config to get base model path
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peft_config = PeftConfig.from_pretrained(adapter_path)
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# Load base model and tokenizer (CPU-safe)
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base_model = AutoModelForCausalLM.from_pretrained(
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peft_config.base_model_name_or_path,
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torch_dtype=torch.float32,
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device_map={"": "cpu"}
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)
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tokenizer = AutoTokenizer.from_pretrained(peft_config.base_model_name_or_path)
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# Load LoRA adapter
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model = PeftModel.from_pretrained(base_model, adapter_path, device_map={"": "cpu"})
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# Build inference pipeline
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pipe = pipeline("text-generation", model=model, tokenizer=tokenizer)
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except Exception as e:
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raise RuntimeError(f"❌ Failed to load model + adapter: {str(e)}")
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# === Request Schema ===
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class EmailInput(BaseModel):
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subject: str
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body: str
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# === Endpoint ===
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@app.post("/classify")
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async def classify_email(data: EmailInput):
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prompt = f"""### Subject:\n{data.subject}\n\n### Body:\n{data.body}\n\n### Labels:"""
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try:
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result = pipe(prompt, max_new_tokens=50, do_sample=True, top_k=50, top_p=0.95)
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full_text = result[0]["generated_text"]
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label_section = full_text.split("### Labels:")[1].strip()
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return {"label": label_section}
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except Exception as e:
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raise HTTPException(status_code=500, detail=f"Model inference failed: {str(e)}")
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