114 lines
3.1 KiB
Python
114 lines
3.1 KiB
Python
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from typing import TypedDict, List
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from langgraph.graph import StateGraph, END
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class RagState(TypedDict):
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query: str
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query_embedding: List[float]
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retrieved_docs: List[dict]
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context: str
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answer: str
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sources: List[dict]
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def embed_query(state: RagState) -> dict:
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"""将查询转为向量"""
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from app.services import embedding_service
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embedding = embedding_service.embed_single(state["query"])
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return {"query_embedding": embedding}
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def retrieve_docs(state: RagState) -> dict:
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"""向量检索"""
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from app.services import milvus_service
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from app.core.config import settings
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docs = milvus_service.search(
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state["query_embedding"],
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top_k=settings.vector_top_k,
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)
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return {"retrieved_docs": docs[:settings.final_top_k]}
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def build_context(state: RagState) -> dict:
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"""构建上下文"""
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context_parts = []
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sources = []
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for doc in state["retrieved_docs"]:
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context_parts.append(f"【{doc['doc_name']} - {doc.get('clause_id', '')}】\n{doc['content']}")
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sources.append({
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"name": doc["doc_name"],
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"clause": doc.get("clause_id"),
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})
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context = "\n\n".join(context_parts)
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return {"context": context, "sources": sources}
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def generate_answer(state: RagState) -> dict:
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"""生成答案"""
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from app.services import llm_service
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prompt = f"""请根据以下法规内容回答用户问题，并在回答中标注引用的法规条款。
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法规内容：
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{state['context']}
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用户问题：{state['query']}
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请给出准确、简洁的回答，并引用相关法规条款。"""
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answer = ""
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for chunk in llm_service.generate_stream(prompt):
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answer += chunk
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return {"answer": answer}
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# 构建工作流图
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rag_graph = StateGraph(RagState)
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rag_graph.add_node("embed", embed_query)
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rag_graph.add_node("retrieve", retrieve_docs)
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rag_graph.add_node("build_context", build_context)
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rag_graph.add_node("generate", generate_answer)
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rag_graph.set_entry_point("embed")
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rag_graph.add_edge("embed", "retrieve")
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rag_graph.add_edge("retrieve", "build_context")
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rag_graph.add_edge("build_context", "generate")
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rag_graph.add_edge("generate", END)
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rag_workflow = rag_graph.compile()
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async def run_rag_workflow(query: str) -> RagState:
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"""运行RAG工作流"""
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initial_state: RagState = {"query": query}
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result = rag_workflow.invoke(initial_state)
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return result
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def stream_rag_workflow(query: str):
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"""流式运行RAG工作流"""
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from app.services import llm_service
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# 先完成检索阶段
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state: RagState = {"query": query}
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state.update(embed_query(state))
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state.update(retrieve_docs(state))
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state.update(build_context(state))
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# 流式生成阶段
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prompt = f"""请根据以下法规内容回答用户问题，并在回答中标注引用的法规条款。
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法规内容：
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{state['context']}
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用户问题：{state['query']}
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请给出准确、简洁的回答，并引用相关法规条款。"""
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for chunk in llm_service.generate_stream(prompt):
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yield {"type": "chunk", "text": chunk}
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yield {"type": "done", "sources": state["sources"]}
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