678 lines
23 KiB
Python
678 lines
23 KiB
Python
import time
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from asyncio.log import logger
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import re
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import sys
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import uvicorn
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import gc
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import json
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import torch
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import random
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import string
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from vllm import SamplingParams, AsyncEngineArgs, AsyncLLMEngine
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from fastapi import FastAPI, HTTPException, Response
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from fastapi.middleware.cors import CORSMiddleware
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from contextlib import asynccontextmanager
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from typing import List, Literal, Optional, Union
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from pydantic import BaseModel, Field
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from transformers import AutoTokenizer, LogitsProcessor
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from sse_starlette.sse import EventSourceResponse
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EventSourceResponse.DEFAULT_PING_INTERVAL = 1000
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MAX_MODEL_LENGTH = 8192
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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yield
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if torch.cuda.is_available():
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torch.cuda.empty_cache()
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torch.cuda.ipc_collect()
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app = FastAPI(lifespan=lifespan)
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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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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def generate_id(prefix: str, k=29) -> str:
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suffix = ''.join(random.choices(string.ascii_letters + string.digits, k=k))
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return f"{prefix}{suffix}"
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class ModelCard(BaseModel):
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id: str = ""
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object: str = "model"
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created: int = Field(default_factory=lambda: int(time.time()))
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owned_by: str = "owner"
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root: Optional[str] = None
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parent: Optional[str] = None
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permission: Optional[list] = None
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class ModelList(BaseModel):
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object: str = "list"
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data: List[ModelCard] = ["glm-4"]
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class FunctionCall(BaseModel):
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name: Optional[str] = None
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arguments: Optional[str] = None
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class ChoiceDeltaToolCallFunction(BaseModel):
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name: Optional[str] = None
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arguments: Optional[str] = None
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class UsageInfo(BaseModel):
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prompt_tokens: int = 0
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total_tokens: int = 0
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completion_tokens: Optional[int] = 0
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class ChatCompletionMessageToolCall(BaseModel):
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index: Optional[int] = 0
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id: Optional[str] = None
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function: FunctionCall
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type: Optional[Literal["function"]] = 'function'
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class ChatMessage(BaseModel):
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# “function” 字段解释：
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# 使用较老的OpenAI API版本需要注意在这里添加 function 字段并在 process_messages函数中添加相应角色转换逻辑为 observation
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role: Literal["user", "assistant", "system", "tool"]
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content: Optional[str] = None
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function_call: Optional[ChoiceDeltaToolCallFunction] = None
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tool_calls: Optional[List[ChatCompletionMessageToolCall]] = None
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class DeltaMessage(BaseModel):
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role: Optional[Literal["user", "assistant", "system"]] = None
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content: Optional[str] = None
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function_call: Optional[ChoiceDeltaToolCallFunction] = None
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tool_calls: Optional[List[ChatCompletionMessageToolCall]] = None
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class ChatCompletionResponseChoice(BaseModel):
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index: int
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message: ChatMessage
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finish_reason: Literal["stop", "length", "tool_calls"]
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class ChatCompletionResponseStreamChoice(BaseModel):
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delta: DeltaMessage
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finish_reason: Optional[Literal["stop", "length", "tool_calls"]]
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index: int
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class ChatCompletionResponse(BaseModel):
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model: str
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id: Optional[str] = Field(default_factory=lambda: generate_id('chatcmpl-', 29))
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object: Literal["chat.completion", "chat.completion.chunk"]
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choices: List[Union[ChatCompletionResponseChoice, ChatCompletionResponseStreamChoice]]
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created: Optional[int] = Field(default_factory=lambda: int(time.time()))
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system_fingerprint: Optional[str] = Field(default_factory=lambda: generate_id('fp_', 9))
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usage: Optional[UsageInfo] = None
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class ChatCompletionRequest(BaseModel):
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model: str
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messages: List[ChatMessage]
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temperature: Optional[float] = 0.8
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top_p: Optional[float] = 0.8
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max_tokens: Optional[int] = None
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stream: Optional[bool] = False
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tools: Optional[Union[dict, List[dict]]] = None
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tool_choice: Optional[Union[str, dict]] = None
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repetition_penalty: Optional[float] = 1.1
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class InvalidScoreLogitsProcessor(LogitsProcessor):
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def __call__(
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self, input_ids: torch.LongTensor, scores: torch.FloatTensor
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) -> torch.FloatTensor:
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if torch.isnan(scores).any() or torch.isinf(scores).any():
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scores.zero_()
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scores[..., 5] = 5e4
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return scores
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def process_response(output: str, tools: dict | List[dict] = None, use_tool: bool = False) -> Union[str, dict]:
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lines = output.strip().split("\n")
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arguments_json = None
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special_tools = ["cogview", "simple_browser"]
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tools = {tool['function']['name'] for tool in tools} if tools else {}
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# 这是一个简单的工具比较函数，不能保证拦截所有非工具输出的结果，比如参数未对齐等特殊情况。
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##TODO 如果你希望做更多判断，可以在这里进行逻辑完善。
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if len(lines) >= 2 and lines[1].startswith("{"):
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function_name = lines[0].strip()
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arguments = "\n".join(lines[1:]).strip()
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if function_name in tools or function_name in special_tools:
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try:
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arguments_json = json.loads(arguments)
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is_tool_call = True
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except json.JSONDecodeError:
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is_tool_call = function_name in special_tools
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if is_tool_call and use_tool:
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content = {
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"name": function_name,
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"arguments": json.dumps(arguments_json if isinstance(arguments_json, dict) else arguments,
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ensure_ascii=False)
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}
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if function_name == "simple_browser":
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search_pattern = re.compile(r'search\("(.+?)"\s*,\s*recency_days\s*=\s*(\d+)\)')
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match = search_pattern.match(arguments)
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if match:
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content["arguments"] = json.dumps({
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"query": match.group(1),
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"recency_days": int(match.group(2))
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}, ensure_ascii=False)
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elif function_name == "cogview":
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content["arguments"] = json.dumps({
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"prompt": arguments
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}, ensure_ascii=False)
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return content
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return output.strip()
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@torch.inference_mode()
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async def generate_stream_glm4(params):
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messages = params["messages"]
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tools = params["tools"]
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tool_choice = params["tool_choice"]
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temperature = float(params.get("temperature", 1.0))
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repetition_penalty = float(params.get("repetition_penalty", 1.0))
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top_p = float(params.get("top_p", 1.0))
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max_new_tokens = int(params.get("max_tokens", 8192))
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messages = process_messages(messages, tools=tools, tool_choice=tool_choice)
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inputs = tokenizer.apply_chat_template(messages, add_generation_prompt=True, tokenize=False)
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params_dict = {
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"n": 1,
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"best_of": 1,
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"presence_penalty": 1.0,
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"frequency_penalty": 0.0,
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"temperature": temperature,
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"top_p": top_p,
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"top_k": -1,
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"repetition_penalty": repetition_penalty,
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"stop_token_ids": [151329, 151336, 151338],
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"ignore_eos": False,
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"max_tokens": max_new_tokens,
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"logprobs": None,
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"prompt_logprobs": None,
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"skip_special_tokens": True,
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}
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sampling_params = SamplingParams(**params_dict)
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async for output in engine.generate(prompt=inputs, sampling_params=sampling_params, request_id=f"{time.time()}"):
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output_len = len(output.outputs[0].token_ids)
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input_len = len(output.prompt_token_ids)
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ret = {
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"text": output.outputs[0].text,
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"usage": {
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"prompt_tokens": input_len,
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"completion_tokens": output_len,
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"total_tokens": output_len + input_len
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},
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"finish_reason": output.outputs[0].finish_reason,
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}
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yield ret
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gc.collect()
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torch.cuda.empty_cache()
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def process_messages(messages, tools=None, tool_choice="none"):
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_messages = messages
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processed_messages = []
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msg_has_sys = False
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def filter_tools(tool_choice, tools):
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function_name = tool_choice.get('function', {}).get('name', None)
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if not function_name:
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return []
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filtered_tools = [
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tool for tool in tools
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if tool.get('function', {}).get('name') == function_name
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]
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return filtered_tools
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if tool_choice != "none":
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if isinstance(tool_choice, dict):
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tools = filter_tools(tool_choice, tools)
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if tools:
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processed_messages.append(
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{
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"role": "system",
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"content": None,
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"tools": tools
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}
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)
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msg_has_sys = True
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if isinstance(tool_choice, dict) and tools:
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processed_messages.append(
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{
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"role": "assistant",
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"metadata": tool_choice["function"]["name"],
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"content": ""
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}
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)
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for m in _messages:
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role, content, func_call = m.role, m.content, m.function_call
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tool_calls = getattr(m, 'tool_calls', None)
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if role == "function":
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processed_messages.append(
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{
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"role": "observation",
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"content": content
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}
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)
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elif role == "tool":
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processed_messages.append(
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{
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"role": "observation",
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"content": content,
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"function_call": True
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}
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)
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elif role == "assistant":
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if tool_calls:
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for tool_call in tool_calls:
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processed_messages.append(
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{
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"role": "assistant",
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"metadata": tool_call.function.name,
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"content": tool_call.function.arguments
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}
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)
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else:
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for response in content.split("\n"):
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if "\n" in response:
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metadata, sub_content = response.split("\n", maxsplit=1)
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else:
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metadata, sub_content = "", response
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processed_messages.append(
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{
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"role": role,
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"metadata": metadata,
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"content": sub_content.strip()
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}
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)
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else:
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if role == "system" and msg_has_sys:
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msg_has_sys = False
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continue
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processed_messages.append({"role": role, "content": content})
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if not tools or tool_choice == "none":
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for m in _messages:
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if m.role == 'system':
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processed_messages.insert(0, {"role": m.role, "content": m.content})
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break
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return processed_messages
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@app.get("/health")
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async def health() -> Response:
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"""Health check."""
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return Response(status_code=200)
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@app.get("/v1/models", response_model=ModelList)
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async def list_models():
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model_card = ModelCard(id="glm-4")
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return ModelList(data=[model_card])
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@app.post("/v1/chat/completions", response_model=ChatCompletionResponse)
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async def create_chat_completion(request: ChatCompletionRequest):
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if len(request.messages) < 1 or request.messages[-1].role == "assistant":
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raise HTTPException(status_code=400, detail="Invalid request")
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gen_params = dict(
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messages=request.messages,
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temperature=request.temperature,
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top_p=request.top_p,
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max_tokens=request.max_tokens or 1024,
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echo=False,
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stream=request.stream,
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repetition_penalty=request.repetition_penalty,
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tools=request.tools,
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tool_choice=request.tool_choice,
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)
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logger.debug(f"==== request ====\n{gen_params}")
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if request.stream:
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predict_stream_generator = predict_stream(request.model, gen_params)
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output = await anext(predict_stream_generator)
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if output:
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return EventSourceResponse(predict_stream_generator, media_type="text/event-stream")
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logger.debug(f"First result output：\n{output}")
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function_call = None
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if output and request.tools:
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try:
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function_call = process_response(output, request.tools, use_tool=True)
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except:
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logger.warning("Failed to parse tool call")
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if isinstance(function_call, dict):
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function_call = ChoiceDeltaToolCallFunction(**function_call)
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generate = parse_output_text(request.model, output, function_call=function_call)
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return EventSourceResponse(generate, media_type="text/event-stream")
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else:
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return EventSourceResponse(predict_stream_generator, media_type="text/event-stream")
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response = ""
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async for response in generate_stream_glm4(gen_params):
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pass
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if response["text"].startswith("\n"):
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response["text"] = response["text"][1:]
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response["text"] = response["text"].strip()
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usage = UsageInfo()
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function_call, finish_reason = None, "stop"
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tool_calls = None
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if request.tools:
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try:
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function_call = process_response(response["text"], request.tools, use_tool=True)
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except Exception as e:
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logger.warning(f"Failed to parse tool call: {e}")
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if isinstance(function_call, dict):
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finish_reason = "tool_calls"
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function_call_response = ChoiceDeltaToolCallFunction(**function_call)
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function_call_instance = FunctionCall(
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name=function_call_response.name,
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arguments=function_call_response.arguments
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)
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tool_calls = [
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ChatCompletionMessageToolCall(
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id=generate_id('call_', 24),
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function=function_call_instance,
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type="function")]
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message = ChatMessage(
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role="assistant",
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content=None if tool_calls else response["text"],
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function_call=None,
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tool_calls=tool_calls,
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)
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logger.debug(f"==== message ====\n{message}")
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choice_data = ChatCompletionResponseChoice(
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index=0,
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message=message,
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finish_reason=finish_reason,
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)
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task_usage = UsageInfo.model_validate(response["usage"])
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for usage_key, usage_value in task_usage.model_dump().items():
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setattr(usage, usage_key, getattr(usage, usage_key) + usage_value)
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return ChatCompletionResponse(
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model=request.model,
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choices=[choice_data],
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object="chat.completion",
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usage=usage
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)
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async def predict_stream(model_id, gen_params):
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output = ""
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is_function_call = False
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has_send_first_chunk = False
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created_time = int(time.time())
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function_name = None
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response_id = generate_id('chatcmpl-', 29)
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system_fingerprint = generate_id('fp_', 9)
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tools = {tool['function']['name'] for tool in gen_params['tools']} if gen_params['tools'] else {}
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delta_text = ""
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async for new_response in generate_stream_glm4(gen_params):
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decoded_unicode = new_response["text"]
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delta_text += decoded_unicode[len(output):]
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output = decoded_unicode
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lines = output.strip().split("\n")
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# 检查是否为工具
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# 这是一个简单的工具比较函数，不能保证拦截所有非工具输出的结果，比如参数未对齐等特殊情况。
|
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##TODO 如果你希望做更多处理，可以在这里进行逻辑完善。
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|
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if not is_function_call and len(lines) >= 2:
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first_line = lines[0].strip()
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if first_line in tools:
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is_function_call = True
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function_name = first_line
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delta_text = lines[1]
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# 工具调用返回
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if is_function_call:
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if not has_send_first_chunk:
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function_call = {"name": function_name, "arguments": ""}
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tool_call = ChatCompletionMessageToolCall(
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index=0,
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id=generate_id('call_', 24),
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function=FunctionCall(**function_call),
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type="function"
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)
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message = DeltaMessage(
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content=None,
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role="assistant",
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function_call=None,
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tool_calls=[tool_call]
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)
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choice_data = ChatCompletionResponseStreamChoice(
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index=0,
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delta=message,
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finish_reason=None
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)
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chunk = ChatCompletionResponse(
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model=model_id,
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id=response_id,
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choices=[choice_data],
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created=created_time,
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system_fingerprint=system_fingerprint,
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object="chat.completion.chunk"
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)
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yield ""
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yield chunk.model_dump_json(exclude_unset=True)
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has_send_first_chunk = True
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function_call = {"name": None, "arguments": delta_text}
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delta_text = ""
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tool_call = ChatCompletionMessageToolCall(
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index=0,
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id=None,
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function=FunctionCall(**function_call),
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type="function"
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)
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message = DeltaMessage(
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content=None,
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role=None,
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function_call=None,
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tool_calls=[tool_call]
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)
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choice_data = ChatCompletionResponseStreamChoice(
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index=0,
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delta=message,
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finish_reason=None
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)
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chunk = ChatCompletionResponse(
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model=model_id,
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id=response_id,
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choices=[choice_data],
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created=created_time,
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system_fingerprint=system_fingerprint,
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object="chat.completion.chunk"
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)
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yield chunk.model_dump_json(exclude_unset=True)
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|
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# 用户请求了 Function Call 但是框架还没确定是否为Function Call
|
||
elif (gen_params["tools"] and gen_params["tool_choice"] != "none") or is_function_call:
|
||
continue
|
||
|
||
# 常规返回
|
||
else:
|
||
finish_reason = new_response.get("finish_reason", None)
|
||
if not has_send_first_chunk:
|
||
message = DeltaMessage(
|
||
content="",
|
||
role="assistant",
|
||
function_call=None,
|
||
)
|
||
choice_data = ChatCompletionResponseStreamChoice(
|
||
index=0,
|
||
delta=message,
|
||
finish_reason=finish_reason
|
||
)
|
||
chunk = ChatCompletionResponse(
|
||
model=model_id,
|
||
id=response_id,
|
||
choices=[choice_data],
|
||
created=created_time,
|
||
system_fingerprint=system_fingerprint,
|
||
object="chat.completion.chunk"
|
||
)
|
||
yield chunk.model_dump_json(exclude_unset=True)
|
||
has_send_first_chunk = True
|
||
|
||
message = DeltaMessage(
|
||
content=delta_text,
|
||
role="assistant",
|
||
function_call=None,
|
||
)
|
||
delta_text = ""
|
||
choice_data = ChatCompletionResponseStreamChoice(
|
||
index=0,
|
||
delta=message,
|
||
finish_reason=finish_reason
|
||
)
|
||
chunk = ChatCompletionResponse(
|
||
model=model_id,
|
||
id=response_id,
|
||
choices=[choice_data],
|
||
created=created_time,
|
||
system_fingerprint=system_fingerprint,
|
||
object="chat.completion.chunk"
|
||
)
|
||
yield chunk.model_dump_json(exclude_unset=True)
|
||
|
||
# 工具调用需要额外返回一个字段以对齐 OpenAI 接口
|
||
if is_function_call:
|
||
yield ChatCompletionResponse(
|
||
model=model_id,
|
||
id=response_id,
|
||
system_fingerprint=system_fingerprint,
|
||
choices=[
|
||
ChatCompletionResponseStreamChoice(
|
||
index=0,
|
||
delta=DeltaMessage(
|
||
content=None,
|
||
role=None,
|
||
function_call=None,
|
||
),
|
||
finish_reason="tool_calls"
|
||
)],
|
||
created=created_time,
|
||
object="chat.completion.chunk",
|
||
usage=None
|
||
).model_dump_json(exclude_unset=True)
|
||
elif delta_text != "":
|
||
message = DeltaMessage(
|
||
content="",
|
||
role="assistant",
|
||
function_call=None,
|
||
)
|
||
choice_data = ChatCompletionResponseStreamChoice(
|
||
index=0,
|
||
delta=message,
|
||
finish_reason=None
|
||
)
|
||
chunk = ChatCompletionResponse(
|
||
model=model_id,
|
||
id=response_id,
|
||
choices=[choice_data],
|
||
created=created_time,
|
||
system_fingerprint=system_fingerprint,
|
||
object="chat.completion.chunk"
|
||
)
|
||
yield chunk.model_dump_json(exclude_unset=True)
|
||
|
||
finish_reason = 'stop'
|
||
message = DeltaMessage(
|
||
content=delta_text,
|
||
role="assistant",
|
||
function_call=None,
|
||
)
|
||
delta_text = ""
|
||
choice_data = ChatCompletionResponseStreamChoice(
|
||
index=0,
|
||
delta=message,
|
||
finish_reason=finish_reason
|
||
)
|
||
chunk = ChatCompletionResponse(
|
||
model=model_id,
|
||
id=response_id,
|
||
choices=[choice_data],
|
||
created=created_time,
|
||
system_fingerprint=system_fingerprint,
|
||
object="chat.completion.chunk"
|
||
)
|
||
yield chunk.model_dump_json(exclude_unset=True)
|
||
yield '[DONE]'
|
||
else:
|
||
yield '[DONE]'
|
||
|
||
async def parse_output_text(model_id: str, value: str, function_call: ChoiceDeltaToolCallFunction = None):
|
||
delta = DeltaMessage(role="assistant", content=value)
|
||
if function_call is not None:
|
||
delta.function_call = function_call
|
||
|
||
choice_data = ChatCompletionResponseStreamChoice(
|
||
index=0,
|
||
delta=delta,
|
||
finish_reason=None
|
||
)
|
||
chunk = ChatCompletionResponse(
|
||
model=model_id,
|
||
choices=[choice_data],
|
||
object="chat.completion.chunk"
|
||
)
|
||
yield "{}".format(chunk.model_dump_json(exclude_unset=True))
|
||
yield '[DONE]'
|
||
|
||
|
||
if __name__ == "__main__":
|
||
MODEL_PATH = sys.argv[1]
|
||
tokenizer = AutoTokenizer.from_pretrained(MODEL_PATH, trust_remote_code=True)
|
||
engine_args = AsyncEngineArgs(
|
||
model=MODEL_PATH,
|
||
tokenizer=MODEL_PATH,
|
||
# 如果你有多张显卡，可以在这里设置成你的显卡数量
|
||
tensor_parallel_size=1,
|
||
# dtype="bfloat16",
|
||
dtype="half",
|
||
trust_remote_code=True,
|
||
# 占用显存的比例，请根据你的显卡显存大小设置合适的值，例如，如果你的显卡有80G，您只想使用24G，请按照24/80=0.3设置
|
||
gpu_memory_utilization=0.9,
|
||
enforce_eager=True,
|
||
worker_use_ray=False,
|
||
disable_log_requests=True,
|
||
max_model_len=MAX_MODEL_LENGTH,
|
||
)
|
||
engine = AsyncLLMEngine.from_engine_args(engine_args)
|
||
uvicorn.run(app, host='0.0.0.0', port=6006, workers=1)
|