366 lines
13 KiB
Python
366 lines
13 KiB
Python
import asyncio
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import httpx
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from typing import List, Union
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import os
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import numpy as np
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from openai import OpenAI
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from config import LLM_CONFIG, EMBEDDING_CONFIG
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from openai import AsyncOpenAI
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# 模块级单例客户端，避免每次调用都创建新连接
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_async_client: AsyncOpenAI = None
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def _get_async_client() -> AsyncOpenAI:
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"""获取或创建 AsyncOpenAI 单例客户端"""
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global _async_client
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if _async_client is None:
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_async_client = AsyncOpenAI(
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api_key=LLM_CONFIG["api_key"],
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base_url=LLM_CONFIG["base_url"],
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)
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return _async_client
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class OpenaiAPI:
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@staticmethod
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async def open_api_chat_without_thinking(
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query: str = None,
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model: str = None,
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json_output: bool = False,
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system_prompt: str = None,
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messages: list = None,
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enable_thinking: bool = True,
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temperature: float = 0.1
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) -> str:
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if model is None:
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model = LLM_CONFIG["model"]
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if system_prompt is None:
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system_prompt = "我是一个专业的AI助手，请用中文回答问题。请直接给出最终答案，不要包含任何推理步骤、思考过程、解释性文字或前缀。"
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# 构建消息
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message_list = [{"role": "system", "content": system_prompt}]
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if messages is not None:
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message_list.extend(messages)
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if query is not None:
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message_list.append({"role": "user", "content": query})
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client = _get_async_client()
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kwargs = {
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"model": model,
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"messages": message_list,
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"temperature": temperature,
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"stream": False,
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"max_tokens":LLM_CONFIG["max_tokens"]
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}
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kwargs["extra_body"] = {"chat_template_kwargs": {"enable_thinking": False}}
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if json_output:
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kwargs["response_format"] = {"type": "json_object"}
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print("model API. history message", message_list)
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response = await client.chat.completions.create(**kwargs)
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return response.choices[0].message.content
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@staticmethod
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async def open_api_chat_stream(
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query: str = None,
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model: str = None,
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json_output: bool = False,
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system_prompt: str = None,
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messages: list = None,
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enable_thinking: bool = True,
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temperature: float = 0.1
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):
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"""
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流式输出大模型响应
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Yields:
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str: 流式内容片段
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"""
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if model is None:
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model = LLM_CONFIG["model"]
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if system_prompt is None:
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system_prompt = "我是一个专业的AI助手，请用中文回答问题。请直接给出最终答案，不要包含任何推理步骤、思考过程、解释性文字或前缀。"
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# 构建消息
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message_list = [{"role": "system", "content": system_prompt}]
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if messages is not None:
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message_list.extend(messages)
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if query is not None:
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message_list.append({"role": "user", "content": query})
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client = _get_async_client()
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kwargs = {
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"model": model,
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"messages": message_list,
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"temperature": temperature,
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"stream": True,
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"max_tokens":LLM_CONFIG["max_tokens"]
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}
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kwargs["extra_body"] = {"chat_template_kwargs": {"enable_thinking": False}}
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if json_output:
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kwargs["response_format"] = {"type": "json_object"}
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print("model API stream. history message", message_list)
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stream = await client.chat.completions.create(**kwargs)
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async for chunk in stream:
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if chunk.choices and len(chunk.choices) > 0:
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delta = chunk.choices[0].delta
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if delta.content:
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yield delta.content
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@staticmethod
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async def open_api_vl_without_thinking(
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image_url: str
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) -> str:
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"""
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专门用于从图片中提取【设备名称】和【故障现象】。
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自动过滤思考过程，仅返回核心结果。
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参数:
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image_url: Base64 格式的图片数据 (data:image/...;base64,...)
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model: 模型名称，默认为配置中的模型
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custom_instruction: 额外的特定指令 (可选)
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"""
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# 1. 确定模型名称
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model = LLM_CONFIG.get("model")
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# 2. 构建强约束的 System Prompt
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# 核心目标：禁止思考标签，禁止废话，只给结果
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system_prompt = (
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"你是一个视觉分析专家。你的任务是从图片中识别内容并进行描述。\n"
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"【严格约束】\n"
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"1. 绝对禁止输出 <think>, <think>, <reasoning> 等任何思考过程标签。\n"
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"2. 绝对禁止输出'好的'、'根据图片'、'分析如下'等开场白或结束语。\n"
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"3. 直接输出最终结论，格式必须严格遵守下面的模板。"
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)
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# 3. 构建针对性的 User Prompt
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default_task = (
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"请分析这张图片，描述图片内容，重点关注以下信息\n"
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"1. 图片整体阐述了什么主题，描述了哪些内容\n"
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"请用专业、客观、简短的语言描述。"
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)
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final_user_prompt = default_task
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# 4. 初始化客户端
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client = _get_async_client()
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# 5. 构建请求参数
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kwargs = {
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"model": model,
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"messages": [
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{"role": "system", "content": system_prompt},
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{
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"role": "user",
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"content": [
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{"type": "text", "text": final_user_prompt},
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{"type": "image_url", "image_url": {"url": image_url}}
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]
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}
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],
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"temperature": 0.1, # 低温度以保证事实准确性
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"stream": False,
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"max_tokens": LLM_CONFIG.get("max_tokens"),
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}
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# 尝试通过参数关闭思考 (取决于后端支持情况)
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kwargs["extra_body"] = {"chat_template_kwargs": {"enable_thinking": False}}
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try:
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print(f"🚀 正在调用 {model} 进行图片内容分析...")
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response = await client.chat.completions.create(**kwargs)
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raw_content = response.choices[0].message.content or ""
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print(f"✅ 分析完成:\n{raw_content}")
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return raw_content
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except Exception as e:
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import traceback
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error_msg = f"❌ 图片内容分析失败：{str(e)}\n{traceback.format_exc()}"
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print(error_msg)
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return f"Error: {str(e)}"
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@staticmethod
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def get_embeddings(embedding_text: str):
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embedding_base_url = EMBEDDING_CONFIG["base_url"]
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with httpx.Client(timeout=60) as client:
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response = client.post(
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embedding_base_url,
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json={"model": EMBEDDING_CONFIG["model"], "input": embedding_text},
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headers={"Authorization": EMBEDDING_CONFIG["api_key"]},
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)
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embedding_text = response.json()["data"][0]["embedding"]
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return embedding_text
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@staticmethod
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async def get_embeddings_async(embedding_text: str) -> List[float]:
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embedding_base_url = EMBEDDING_CONFIG["base_url"]
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async with httpx.AsyncClient(timeout=60) as client:
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response = await client.post(
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embedding_base_url,
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json={"model": EMBEDDING_CONFIG["model"], "input": embedding_text},
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headers={"Authorization": EMBEDDING_CONFIG["api_key"]},
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)
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embedding = response.json()["data"][0]["embedding"]
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return embedding
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@staticmethod
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async def get_embeddings_batch_async(texts: List[str]) -> List[List[float]]:
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embedding_base_url = EMBEDDING_CONFIG["base_url"]
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async with httpx.AsyncClient(timeout=120) as client:
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response = await client.post(
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embedding_base_url,
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json={"model": EMBEDDING_CONFIG["model"], "input": texts},
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headers={"Authorization": EMBEDDING_CONFIG["api_key"]},
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)
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data = response.json()["data"]
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sorted_data = sorted(data, key=lambda x: x["index"])
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embeddings = [item["embedding"] for item in sorted_data]
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return embeddings
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@staticmethod
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def cosine_similarity(vec1: Union[List[float], np.ndarray], vec2: Union[List[float], np.ndarray]) -> float:
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v1 = np.array(vec1) if not isinstance(vec1, np.ndarray) else vec1
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v2 = np.array(vec2) if not isinstance(vec2, np.ndarray) else vec2
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norm1 = np.linalg.norm(v1)
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norm2 = np.linalg.norm(v2)
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if norm1 == 0 or norm2 == 0:
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return 0.0
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return float(np.dot(v1, v2) / (norm1 * norm2))
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@staticmethod
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def cosine_similarity_batch(query_vec: Union[List[float], np.ndarray],
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candidates_vecs: List[Union[List[float], np.ndarray]]) -> List[float]:
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query = np.array(query_vec) if not isinstance(query_vec, np.ndarray) else query_vec
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candidates = [np.array(v) if not isinstance(v, np.ndarray) else v for v in candidates_vecs]
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query_norm = np.linalg.norm(query)
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if query_norm == 0:
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return [0.0] * len(candidates)
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similarities = []
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for candidate in candidates:
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cand_norm = np.linalg.norm(candidate)
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if cand_norm == 0:
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similarities.append(0.0)
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else:
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sim = float(np.dot(query, candidate) / (query_norm * cand_norm))
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similarities.append(sim)
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return similarities
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@staticmethod
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async def hybrid_match_with_embeddings(
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query_text: str,
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candidates: List[dict],
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name_key: str = "display_name",
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embedding_key: str = "embedding",
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text_weight: float = 0.3,
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semantic_weight: float = 0.7,
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text_threshold: float = 0.3,
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semantic_threshold: float = 0.5
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) -> tuple:
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if not candidates:
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return None, 0.0
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query_embedding = await OpenaiAPI.get_embeddings_async(query_text)
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scored_candidates = []
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for idx, candidate in enumerate(candidates):
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name = candidate.get(name_key, "")
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if not name:
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props = candidate.get("props", {})
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name = props.get("name") or props.get("名称") or props.get("设备名称") or ""
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text_score = OpenaiAPI._compute_text_similarity(query_text, name)
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props = candidate.get("props", {})
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candidate_embedding = props.get(embedding_key) or candidate.get(embedding_key)
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if candidate_embedding:
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semantic_score = OpenaiAPI.cosine_similarity(query_embedding, candidate_embedding)
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else:
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semantic_score = 0.0
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combined_score = text_weight * text_score + semantic_weight * semantic_score
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scored_candidates.append({
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"candidate": candidate,
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"text_score": text_score,
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"semantic_score": semantic_score,
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"combined_score": combined_score,
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"index": idx
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})
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scored_candidates.sort(key=lambda x: x["combined_score"], reverse=True)
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best = scored_candidates[0]
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best_candidate = best["candidate"]
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best_score = best["combined_score"]
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min_threshold = max(text_threshold * text_weight + semantic_threshold * semantic_weight, 0.3)
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if best_score < min_threshold:
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return None, best_score
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return best_candidate, best_score
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@staticmethod
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def _compute_text_similarity(a: str, b: str) -> float:
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if not a or not b:
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return 0.0
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a = str(a).strip().lower()
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b = str(b).strip().lower()
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if not a or not b:
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return 0.0
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if a == b:
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return 1.0
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if a in b or b in a:
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return 0.9
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set_a, set_b = set(a), set(b)
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inter = len(set_a & set_b)
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union = len(set_a | set_b) or 1
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jaccard = inter / union
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len_diff = abs(len(a) - len(b))
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len_penalty = max(0.0, 1.0 - len_diff / max(len(a), len(b), 1))
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return 0.5 * jaccard + 0.5 * len_penalty
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if __name__ == "__main__":
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answer = asyncio.run(OpenaiAPI.open_api_chat_without_thinking(
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query="你好",
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json_output=True,
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system_prompt="你是一个助手，请用中文回答问题。请直接给出最终答案，不要包含任何推理步骤、思考过程、解释性文字或前缀。",
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enable_thinking=True
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))
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print(answer)
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