RWKV-Runner/backend-python/routes/completion.py

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2023-05-07 17:27:54 +08:00
import json
from typing import List
from fastapi import APIRouter, Request, status, HTTPException
from sse_starlette.sse import EventSourceResponse
from pydantic import BaseModel
from utils.rwkv import *
import global_var
router = APIRouter()
class Message(BaseModel):
role: str
content: str
class CompletionBody(BaseModel):
messages: List[Message]
model: str
stream: bool
max_tokens: int
@router.post("/v1/chat/completions")
@router.post("/chat/completions")
async def completions(body: CompletionBody, request: Request):
model = global_var.get(global_var.Model)
question = body.messages[-1]
if question.role == 'user':
question = question.content
else:
raise HTTPException(status.HTTP_400_BAD_REQUEST, "no question found")
completion_text = ""
for message in body.messages:
if message.role == 'user':
completion_text += "Bob: " + message.content + "\n\n"
elif message.role == 'assistant':
completion_text += "Alice: " + message.content + "\n\n"
completion_text += "Alice:"
async def eval_rwkv():
if body.stream:
for response, delta in rwkv_generate(model, completion_text):
if await request.is_disconnected():
break
yield json.dumps({"response": response, "choices": [{"delta": {"content": delta}}], "model": "rwkv"})
yield "[DONE]"
else:
response = None
for response, delta in rwkv_generate(model, completion_text):
pass
yield json.dumps({"response": response, "model": "rwkv"})
# torch_gc()
return EventSourceResponse(eval_rwkv())