chore: 死代码清理与标注
- 删除 chat_routes.py 中未被使用的 reciprocal_rank_fusion 函数（engine 有同功能方法平替） - 删除 search_hybrid 中无效的 candidates 参数（未传递给 engine，实际由 RERANK_CANDIDATES 控制） - 标注 RAG_SEARCH_CANDIDATES 为死代码 - 标注 VECTOR_WEIGHT/BM25_WEIGHT 在动态 RRF 启用时被覆盖 - 标注 llm_budget.py 模块当前未集成到主流程 - 标注 MAX_LLM_CALLS_PER_QUERY/MAX_QUERY_REWRITES 暂不生效
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lacerate551
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config.py
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config.py
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# RAG 知识库服务配置
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# ================================
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# 敏感信息通过环境变量注入，默认值为空字符串
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import os
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# 加载 .env 文件（敏感信息不写入代码，通过 .env 注入）
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try:
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from dotenv import load_dotenv
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load_dotenv(os.path.join(os.path.dirname(os.path.abspath(__file__)), ".env"))
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except ImportError:
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pass # python-dotenv 未安装时静默跳过
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# ==============================================================================
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# 一、API 密钥与模型
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# ==============================================================================
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# 通义千问 LLM 服务
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DASHSCOPE_API_KEY = os.getenv("DASHSCOPE_API_KEY", "")
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DASHSCOPE_BASE_URL = os.getenv("DASHSCOPE_BASE_URL", "https://token-plan-cn.xiaomimimo.com/v1")
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DASHSCOPE_MODEL = os.getenv("DASHSCOPE_MODEL", "mimo-v2.5") # 文本生成模型
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RAG_CHAT_MODEL = os.getenv("RAG_CHAT_MODEL", "mimo-v2.5") # RAG 对话模型
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INTENT_MODEL = os.getenv("INTENT_MODEL", "mimo-v2.5") # 意图分析模型
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VLM_MODEL = os.getenv("VLM_MODEL", "mimo-v2.5") # 视觉语言模型（图片描述）
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# 兼容旧变量名（逐步迁移到 DASHSCOPE_* 命名）
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API_KEY = DASHSCOPE_API_KEY
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BASE_URL = DASHSCOPE_BASE_URL
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MODEL = DASHSCOPE_MODEL
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# ==============================================================================
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# 二、环境与功能开关
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# ==============================================================================
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APP_ENV = os.getenv("APP_ENV", "dev") # dev / prod
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IS_DEV = APP_ENV == "dev"
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IS_PROD = APP_ENV == "prod"
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# 开发模式开关（控制 mock token 登录、模拟用户等开发功能）
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# 默认开启，生产环境需在 .env 中设置 DEV_MODE=false
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DEV_MODE = os.getenv("DEV_MODE", "true").lower() != "false"
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# 开发/生产环境自动切换
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ENABLE_SESSION = IS_DEV # 会话存储（仅开发环境）
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ENABLE_FEEDBACK = True # 反馈系统
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# 扩展功能（手动开启）
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ENABLE_WEB_SEARCH = False # 网络搜索（需 SERPER_API_KEY）
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# ==============================================================================
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# 三、路径配置
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# ==============================================================================
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PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
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MODELS_DIR = os.path.join(PROJECT_ROOT, "models")
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EMBEDDING_MODEL_PATH = os.path.join(MODELS_DIR, "bge-base-zh-v1.5")
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RERANK_MODEL_PATH = os.path.join(MODELS_DIR, "bge-reranker-base")
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_vector_store_path = os.path.join(PROJECT_ROOT, "knowledge", "vector_store")
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CHROMA_DB_PATH = os.path.join(_vector_store_path, "chroma")
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DOCUMENTS_PATH = os.path.join(PROJECT_ROOT, "documents")
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BM25_INDEXES_PATH = os.path.join(_vector_store_path, "bm25")
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# 文件存储类型: local / smb / s3 / http
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STORAGE_TYPE = os.getenv("STORAGE_TYPE", "local")
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# SMB/CIFS 配置
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STORAGE_SMB_HOST = os.getenv("STORAGE_SMB_HOST", "")
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STORAGE_SMB_SHARE = os.getenv("STORAGE_SMB_SHARE", "")
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STORAGE_SMB_USERNAME = os.getenv("STORAGE_SMB_USERNAME", "")
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STORAGE_SMB_PASSWORD = os.getenv("STORAGE_SMB_PASSWORD", "")
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STORAGE_SMB_DOMAIN = os.getenv("STORAGE_SMB_DOMAIN", "")
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STORAGE_SMB_BASE_PATH = os.getenv("STORAGE_SMB_BASE_PATH", "")
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# S3 配置
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STORAGE_S3_ENDPOINT = os.getenv("STORAGE_S3_ENDPOINT", "")
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STORAGE_S3_BUCKET = os.getenv("STORAGE_S3_BUCKET", "")
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STORAGE_S3_ACCESS_KEY = os.getenv("STORAGE_S3_ACCESS_KEY", "")
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STORAGE_S3_SECRET_KEY = os.getenv("STORAGE_S3_SECRET_KEY", "")
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STORAGE_S3_REGION = os.getenv("STORAGE_S3_REGION", "us-east-1")
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# HTTP 文件服务配置
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STORAGE_HTTP_BASE_URL = os.getenv("STORAGE_HTTP_BASE_URL", "")
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STORAGE_HTTP_TOKEN = os.getenv("STORAGE_HTTP_TOKEN", "")
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STORAGE_HTTP_TIMEOUT = int(os.getenv("STORAGE_HTTP_TIMEOUT", "60"))
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# ==============================================================================
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# 四、设备配置（GPU / CPU）
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# ==============================================================================
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EMBEDDING_DEVICE = os.getenv("EMBEDDING_DEVICE", os.getenv("DEVICE", "auto"))
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RERANK_DEVICE = os.getenv("RERANK_DEVICE", os.getenv("DEVICE", "auto"))
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# ==============================================================================
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# 五、LLM 参数
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# ==============================================================================
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# ----- 通用问答 -----
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LLM_TEMPERATURE = 0.7 # 生成温度（0=确定性，1=随机性）
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LLM_MAX_TOKENS = 3000 # 最大输出 token 数
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# ----- 意图分析（轻量、确定性高）-----
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# INTENT_MODEL 在顶部「一、API 密钥与模型」中统一配置
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INTENT_TEMPERATURE = 0.1
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INTENT_MAX_TOKENS = 2048 # 推理模型需要额外 token 用于思维链
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INTENT_HISTORY_WINDOW = 6 # 分析时取最近几条历史消息
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# ==============================================================================
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# 六、检索参数
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# ==============================================================================
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# ----- 混合检索 -----
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USE_MULTI_KB = True # 多向量库模式
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USE_HYBRID_SEARCH = True # 向量 + BM25 混合检索
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VECTOR_WEIGHT = 0.5 # 向量检索权重（仅在 USE_MULTI_KB=False 时生效；动态 RRF 启用时被覆盖）
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BM25_WEIGHT = 0.5 # BM25 检索权重（同上）
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RAG_SEARCH_TOP_K = 30 # 最终返回结果数（不小于 MMR_TOP_K，避免截断 MMR 输出）
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RAG_SEARCH_CANDIDATES = 100 # [死代码] 候选池大小 — 实际由 RERANK_CANDIDATES 控制，此值未传递给 engine
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RECALL_MULTIPLIER = 3 # 候选池最小倍数 = top_k * 此值
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# ----- 重排序 -----
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USE_RERANK = True # 是否启用重排序
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RERANK_CANDIDATES = 20 # 送入重排序的候选数
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RERANK_TOP_K = 15 # 重排序后保留数
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RERANK_USE_ONNX = os.getenv("RERANK_USE_ONNX", "true").lower() == "true"
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RERANK_CONTEXT_MIN_SCORE = 0.05 # Phase 1：Rerank 分数低于此值的切片不送入 LLM
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# ----- 云端 Reranker（DashScope API）-----
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# RERANK_BACKEND: "local"=本地模型(CPU/GPU)，"cloud"=云端API，"fallback"=优先云端、失败回退本地
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RERANK_BACKEND = os.getenv("RERANK_BACKEND", "local")
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RERANK_CLOUD_MODEL = os.getenv("RERANK_CLOUD_MODEL", "xop3qwen8breranker")
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RERANK_CLOUD_API_KEY = os.getenv("RERANK_CLOUD_API_KEY", DASHSCOPE_API_KEY)
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RERANK_CLOUD_BASE_URL = os.getenv("RERANK_CLOUD_BASE_URL", "https://maas-api.cn-huabei-1.xf-yun.com/v1/rerank")
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RERANK_CLOUD_TIMEOUT = int(os.getenv("RERANK_CLOUD_TIMEOUT", "15")) # 云端请求超时(秒)
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# ----- RRF 融合 -----
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RRF_K = 60 # RRF 常数（越大越平滑）
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DYNAMIC_RRF_ENABLED = True # 根据查询类型动态调整向量/BM25 权重
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# ----- MMR 多样性去重 -----
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MMR_ENABLED = True
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MMR_USE_EMBEDDING = os.getenv("MMR_USE_EMBEDDING", "false").lower() == "true" # True=语义向量（慢），False=文本相似度（快，使用 jieba 词级 Jaccard）
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MMR_TOP_K = 30 # MMR 处理后保留数
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MMR_LAMBDA = 0.5 # 相关性 vs 多样性权衡（0=纯多样，1=纯相关）
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# ----- 查询扩展 -----
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QUERY_EXPANSION_ENABLED = True
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QUERY_EXPANSION_THRESHOLD = 0.8 # 扩展词相似度阈值
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# ----- 章节过滤 -----
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SECTION_FILTER_ENABLED = True # 查询提到章节时优先匹配对应切片
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# ==============================================================================
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# 七、上下文构建
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# ==============================================================================
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MAX_CONTEXT_CHUNKS = 20 # 送给 LLM 的最大文本切片数
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CONTEXT_MAX_CHARS = 8000 # Phase 2：上下文最大字符数（约 4000 token）
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CONTEXT_SOFT_LIMIT = 6000 # Phase 2：软限制，超过后只接受高分切片组
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MAX_SOURCES_RETURNED = 10 # 返回给前端的最大来源数
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MAX_HISTORY_ROUNDS = 10 # 对话历史最大轮数
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IMAGE_CONTEXT_HISTORY = 4 # 图片上下文取最近几轮历史
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DIRECT_CONTEXT_MAX_CHARS = 2000 # 直接回答模式上下文截断字符数
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# ==============================================================================
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# 八、FAQ 与黑名单
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# ==============================================================================
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# FAQ 召回与权重
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FAQ_RECALL_TOP_K = 3 # FAQ 集合单独召回数
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FAQ_BOOST_AMOUNT = 0.1 # FAQ 命中时距离减少量（提升排名）
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# FAQ 时间衰减（防止过期 FAQ 长期霸榜）
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FAQ_DECAY_MONTHS = 6 # 超过此月数开始衰减
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FAQ_DECAY_RATE = 0.01 # 每超一个月的距离惩罚
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FAQ_DECAY_MAX = 0.1 # 最大衰减惩罚
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# 黑名单（负反馈过滤）
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BLACKLIST_MIN_DISLIKES = 3 # 差评达到此数量进入黑名单
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BLACKLIST_CACHE_TTL = 300 # 黑名单缓存刷新间隔（秒）
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# ==============================================================================
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# 九、缓存配置
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# ==============================================================================
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# 查询结果缓存
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QUERY_CACHE_ENABLED = True
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QUERY_CACHE_SIZE = 500
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QUERY_CACHE_TTL = 3600 # 秒
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# Embedding 缓存
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EMBEDDING_CACHE_ENABLED = True
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EMBEDDING_CACHE_SIZE = 2000
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EMBEDDING_CACHE_TTL = 86400
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# Rerank 缓存
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RERANK_CACHE_ENABLED = True
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RERANK_CACHE_SIZE = 1000
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RERANK_CACHE_TTL = 3600
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# 语义缓存（相似查询复用结果）
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SEMANTIC_CACHE_ENABLED = True
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SEMANTIC_CACHE_THRESHOLD = 0.92 # 相似度阈值
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# 缓存写入最低置信度
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# 注意：ChromaDB cosine distance 范围 [0,2]，score = 1 - dist
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# 当前 embedding 模型的 cosine similarity 普遍在 0.03-0.06 之间
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# 搜索管线已通过 rerank 过滤低质量结果，此处不再额外限制
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CACHE_MIN_SCORE = 0.0
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# LLM 调用预算（当前 llm_budget 模块未集成到主流程，以下配置暂不生效）
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MAX_LLM_CALLS_PER_QUERY = 2
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MAX_QUERY_REWRITES = 1
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# ==============================================================================
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# 十、文档解析
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# ==============================================================================
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# MinerU 解析器
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MINERU_DEVICE_MODE = os.getenv("MINERU_DEVICE_MODE", "cpu") # cpu / cuda
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# MinerU 在线 API（优先使用，解析效果更好）
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MINERU_API_TOKEN = os.getenv("MINERU_API_TOKEN", "") # 在 https://mineru.net/apiManage/token 申请
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MINERU_API_URL = os.getenv("MINERU_API_URL", "https://mineru.net/api/v4/extract/task")
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MINERU_PREFER_ONLINE = os.getenv("MINERU_PREFER_ONLINE", "true").lower() == "false" # 优先使用在线 API
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# MinerU 解析模式（本地 + 云端统一配置）
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MINERU_MODEL_VERSION = os.getenv("MINERU_MODEL_VERSION", "pipeline") # 云端解析模型: pipeline(快速推荐) / vlm(高精度慢) / MinerU-HTML
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MINERU_LOCAL_BACKEND = os.getenv("MINERU_LOCAL_BACKEND", "vlm-auto-engine") # 本地解析后端: pipeline(快速推荐) / vlm-auto-engine / hybrid-auto-engine
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MINERU_ONLINE_TIMEOUT = int(os.getenv("MINERU_ONLINE_TIMEOUT", "300")) # 云端解析轮询超时（秒），大文档/VLM 模式建议 600+
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# 分块参数
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CHUNK_SIZE = 1000
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CHUNK_OVERLAP = 100
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MIN_CHUNK_SIZE = 200
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MAX_CHUNK_SIZE = 1200
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# 自适应 TopK（根据置信度动态调整返回数）
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ADAPTIVE_TOPK_ENABLED = True
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ADAPTIVE_LOW_CONFIDENCE = 0.5
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ADAPTIVE_HIGH_CONFIDENCE = 0.8
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ADAPTIVE_EXPAND_RATIO = 2.0
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ADAPTIVE_SHRINK_RATIO = 0.5
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ADAPTIVE_MIN_TOPK = 15
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ADAPTIVE_MAX_TOPK = 20
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# 连续切片完整性保护（枚举/条款/清单类问题）
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CONTEXT_EXPANSION_ENABLED = True
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CONTEXT_EXPANSION_BEFORE = 1
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CONTEXT_EXPANSION_AFTER = 8
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CONTEXT_EXPANSION_MAX_CHUNKS = 50
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EXPANSION_SCORE_THRESHOLD = 0.3 # Phase 3：Rerank 分数低于此值的切片不扩展邻居
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MAX_EXPANDED_NEIGHBORS = 8 # Phase 3：每个种子切片最多扩展的邻居数
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CONFIDENCE_WARN_THRESHOLD = 0.15 # Phase 4：top-3 均分低于此值时，提示 LLM 谨慎回答
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CONFIDENCE_CAUTION_THRESHOLD = 0.30 # Phase 4：top-3 均分低于此值时，提示 LLM 优先引用原文
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ENUM_QUERY_DISABLE_TOPK_SHRINK = True
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ENUM_QUERY_MMR_LAMBDA = 0.85
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# ----- 章节聚类救援（Section-Cluster Rescue）-----
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# 当同一 section 下多个切片（text+table）同时出现在候选集中，
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# 即使单个切片 CrossEncoder 分数很低，也视为强信号进行提升/救援。
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SECTION_CLUSTER_BOOST_ENABLED = True # 引擎层：聚类提升（rerank 后、扩展前）
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SECTION_CLUSTER_RESCUE_ENABLED = True # 路由层：聚类救援（min_score 过滤前）
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BM25_DIVERGENCE_RESCUE_ENABLED = True # 路由层：BM25-CrossEncoder 分歧检测救援
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BM25_DIVERGENCE_MAX_RANK = 3 # 仅救援 BM25 rank <= 此值的切片（top-3 是强信号）
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CLUSTER_MIN_MEMBERS = 3 # 触发聚类的最小切片数
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CLUSTER_MIN_TYPES = 2 # 触发聚类的最小类型多样性（text+table=2）
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CLUSTER_SEED_FLOOR = 0.35 # 引擎层聚类提升后的最低分数（略高于 EXPANSION_SCORE_THRESHOLD=0.3）
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CLUSTER_RESCUE_FLOOR = 0.06 # 路由层救援保底分数（略高于 RERANK_CONTEXT_MIN_SCORE=0.05）
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CLUSTER_MAX_BOOST_PER_SECTION = 8 # 引擎层：每个 section 最大提升切片数
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CLUSTER_MAX_SECTIONS = 3 # 全局最大提升/救援 section 数
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CLUSTER_MAX_RESCUE_PER_SECTION = 6 # 路由层：每个 section 最大救援切片数
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CLUSTER_SECTION_PREFIX_LEVELS = 1 # section_path 归一化保留的层级数（按章节顶层分组）
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# ==============================================================================
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# 十一、可选功能配置
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# ==============================================================================
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# 网络搜索（需 Serper API）
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SERPER_API_KEY = os.getenv("SERPER_API_KEY", "")
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# ==============================================================================
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# 工具函数
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# ==============================================================================
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def get_llm_client():
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"""获取 LLM 客户端实例"""
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from openai import OpenAI
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return OpenAI(api_key=DASHSCOPE_API_KEY, base_url=DASHSCOPE_BASE_URL)
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