app.py

from fastapi import FastAPI, HTTPException
from transformers import AutoModelForCausalLM, AutoTokenizer
from huggingface_hub import hf_hub_download
import os

app = FastAPI()

@app.get("/")
async def generate_text():
    try:
        # Get the cache directory from the environment variable
        cache_dir = os.getenv("TRANSFORMERS_CACHE", "/code/cache")

        # Specify the directory for model download within the Docker container
        model_dir = os.path.join(cache_dir, "TheBloke/Mistral-7B-v0.1-GGUF")
        os.makedirs(model_dir, exist_ok=True)
        
        hf_hub_download(repo_id="TheBloke/Mistral-7B-v0.1-GGUF", filename="mistral-7b-v0.1.Q4_K_M.gguf", local_dir=model_dir)

        tokenizer = AutoTokenizer.from_pretrained(model_dir)
        model = AutoModelForCausalLM.from_pretrained(model_dir)

        prompt = "Once upon a time, there was a"
        inputs = tokenizer(prompt, return_tensors="pt")
        output = model.generate(input_ids=inputs["input_ids"], max_length=50, num_return_sequences=3, temperature=0.7)
        generated_texts = tokenizer.batch_decode(output, skip_special_tokens=True)
        return generated_texts
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))