langchain qa base

.gitignore

@@ -130,4 +130,6 @@ dmypy.json
 # Pyre type checker
 .pyre/
 .DS_Store
-logs
+logs
+
+.vectordb

pilot/configs/model_config.py

@@ -22,6 +22,7 @@ LLM_MODEL_CONFIG = {
 }
 
 
+VECTOR_SEARCH_TOP_K = 5
 LLM_MODEL = "vicuna-13b"
 LIMIT_MODEL_CONCURRENCY = 5
 MAX_POSITION_EMBEDDINGS = 2048

pilot/conversation.py

@@ -146,6 +146,16 @@ conv_vicuna_v1 = Conversation(
     sep2="</s>",
 )
 
+
+conv_qk_prompt_template = """ 基于以下已知的信息, 专业、详细的回答用户的问题。
+            如果无法从提供的恶内容中获取答案, 请说: "知识库中提供的内容不足以回答此问题", 但是你可以给出一些与问题相关答案的建议:   
+            
+            已知内容: 
+            {context}
+            问题:
+            {question}
+"""
+
 default_conversation = conv_one_shot
 
 conv_templates = {

pilot/server/vectordb_qa.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from pilot.vector_store.file_loader import KnownLedge2Vector
+from langchain.prompts import PromptTemplate
+from pilot.conversation import conv_qk_prompt_template
+from langchain.chains import RetrievalQA
+from pilot.configs.model_config import VECTOR_SEARCH_TOP_K
+
+class KnownLedgeBaseQA:
+
+    llm: object = None
+
+    def __init__(self) -> None:
+        k2v = KnownLedge2Vector()
+        self.vector_store = k2v.init_vector_store()
+    
+    def get_answer(self, query):
+        prompt_template = conv_qk_prompt_template
+        
+        prompt = PromptTemplate(
+            template=prompt_template,
+            input_variables=["context", "question"]
+        )
+
+        knownledge_chain = RetrievalQA.from_llm(
+            llm=self.llm,
+            retriever=self.vector_store.as_retriever(search_kwargs={"k", VECTOR_SEARCH_TOP_K}),
+            prompt=prompt
+        )
+        knownledge_chain.return_source_documents = True
+        result = knownledge_chain({"query": query})
+        yield result

pilot/vector_store/file_loader.py

@@ -10,9 +10,8 @@ from langchain.text_splitter import CharacterTextSplitter
 from langchain.document_loaders import UnstructuredFileLoader, UnstructuredPDFLoader, TextLoader
 from langchain.chains import VectorDBQA
 from langchain.embeddings import HuggingFaceEmbeddings
-from pilot.configs.model_config import VECTORE_PATH, DATASETS_DIR, LLM_MODEL_CONFIG
+from pilot.configs.model_config import VECTORE_PATH, DATASETS_DIR, LLM_MODEL_CONFIG, VECTOR_SEARCH_TOP_K
 
-VECTOR_SEARCH_TOP_K = 5
 
 class KnownLedge2Vector:
 
@@ -26,21 +25,21 @@ class KnownLedge2Vector:
             self.embeddings = HuggingFaceEmbeddings(model_name=self.model_name) 
         
     def init_vector_store(self):
-        documents = self.load_knownlege()
         persist_dir = os.path.join(VECTORE_PATH, ".vectordb")
         print("向量数据库持久化地址: ", persist_dir)
         if os.path.exists(persist_dir):
             # 从本地持久化文件中Load
+            print("从本地向量加载数据...")
             vector_store = Chroma(persist_directory=persist_dir, embedding_function=self.embeddings)
-            vector_store.add_documents(documents=documents)
+            # vector_store.add_documents(documents=documents)
         else:
+            documents = self.load_knownlege()
             # 重新初始化
             vector_store = Chroma.from_documents(documents=documents, 
                                                  embedding=self.embeddings,
                                                  persist_directory=persist_dir)
             vector_store.persist()
-            vector_store = None 
-        return persist_dir
+        return vector_store 
 
     def load_knownlege(self):
         docments = []
@@ -70,10 +69,23 @@ class KnownLedge2Vector:
         return docs
 
     def _load_from_url(self, url):
+        """Load data from url address"""
         pass
 
+    
+    def query(self, q):
+        """Query similar doc from Vector """
+        vector_store = self.init_vector_store()
+        docs = vector_store.similarity_search_with_score(q, k=self.top_k)
+        for doc in docs:
+            dc, s = doc
+            yield s, dc
 
 if __name__ == "__main__":
     k2v = KnownLedge2Vector()
-    k2v.init_vector_store()
+
+    persist_dir = os.path.join(VECTORE_PATH, ".vectordb") 
+    print(persist_dir)
+    for s, dc in k2v.query("什么是OceanBase"):
+        print(s, dc.page_content, dc.metadata)