from fastapi import FastAPI, Request, HTTPException from fastapi.responses import JSONResponse, FileResponse from fastapi.staticfiles import StaticFiles from huggingface_hub import InferenceClient import json app = FastAPI() client = InferenceClient("meta-llama/Meta-Llama-3-8B-Instruct") SYSTEM_MESSAGE = ( "You are a helpful, respectful and honest assistant. Always answer as helpfully " "as possible, while being safe. Your answers should not include any harmful, " "unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure " "that your responses are socially unbiased and positive in nature.\n\nIf a question " "does not make any sense, or is not factually coherent, explain why instead of " "answering something not correct. If you don't know the answer to a question, please " "don't share false information." ) MAX_TOKENS = 2000 TEMPERATURE = 0.7 TOP_P = 0.95 def respond(message, history: list[tuple[str, str]]): messages = [{"role": "system", "content": SYSTEM_MESSAGE}] for val in history: if val[0]: messages.append({"role": "user", "content": val[0]}) if val[1]: messages.append({"role": "assistant", "content": val[1]}) messages.append({"role": "user", "content": message}) response = client.chat_completion( messages, max_tokens=MAX_TOKENS, stream=True, temperature=TEMPERATURE, top_p=TOP_P, ) for message in response: # Handle regular iteration yield message.choices[0].delta.content @app.post("/generate/") async def generate(request: Request): form = await request.form() prompt = form.get("prompt") history = json.loads(form.get("history", "[]")) # Default to empty history if not prompt: raise HTTPException(status_code=400, detail="Prompt is required") response_generator = respond(prompt, history) final_response = "" for part in response_generator: final_response += part return JSONResponse(content={"response": final_response}) app.mount("/", StaticFiles(directory="static", html=True), name="static") @app.get("/") def index() -> FileResponse: return FileResponse(path="/app/static/index.html", media_type="text/html")