1.上传文本并将文本向量化
import os
from django.conf import settings
from langchain.document_loaders import TextLoader
from langchain.text_splitter import RecursiveCharacterTextSplitter, CharacterTextSplitter
from langchain.vectorstores import Chroma
from langchain.embeddings import DashScopeEmbeddings
from langchain_community.document_loaders import PyPDFLoader, Docx2txtLoaderfrom pymilvus import MilvusClient, DataTypedef get_embedding(text):file_path = os.path.join(settings.BASE_DIR, 'media', text)loader = ''# 判断文件类型if file_path.endswith('.txt'):loader = TextLoader(file_path, encoding='utf-8')elif file_path.endswith('.pdf'):loader = PyPDFLoader(file_path)elif file_path.endswith('.docx'):loader = Docx2txtLoader(file_path)elif file_path.endswith('.doc'):loader = Docx2txtLoader(file_path)elif file_path.endswith('.md'):loader = TextLoader(file_path)docs = loader.load()text_splitter = RecursiveCharacterTextSplitter(chunk_size=150, chunk_overlap=50)chunks = text_splitter.split_documents(docs)# embeddings = DashScopeEmbeddings(model='text-embedding-v1')# db = Chroma.from_documents(chunks, embeddings, persist_directory='./chroma_db')# db.persist()client = MilvusClient(uri="http://127.0.0.1:19530")schema = MilvusClient.create_schema(auto_id=True,enable_dynamic_field=True,)schema.add_field(field_name="f_id", datatype=DataType.INT64, is_primary=True)schema.add_field(field_name="f_vector", datatype=DataType.FLOAT_VECTOR, dim=1536)schema.add_field(field_name="f_content", datatype=DataType.VARCHAR, max_length=5000)# 准备索引参数对象，用于定义集合中的字段索引index_params = client.prepare_index_params()# 为字段f_id添加索引，索引类型为STL_SORTindex_params.add_index(field_name="f_id",index_type="STL_SORT")# 为字段f_vector添加索引，索引类型为IVF_FLAT，距离度量类型为IP，并设置nlist参数index_params.add_index(field_name="f_vector",index_type="IVF_FLAT",metric_type="IP",params={"nlist": 128})# 创建集合t_file，指定其schema，并设置索引参数client.create_collection(collection_name="app02_file",schema=schema,index_params=index_params)chunk_list = list(map(lambda x: x.page_content, chunks))embedding = DashScopeEmbeddings()chunk_embeds = embedding.embed_documents(chunk_list)data = []for i in range(len(chunk_embeds)):data_row = {"f_vector": chunk_embeds[i], "f_content": chunk_list[i]}data.append(data_row)print(data)client.insert(collection_name="app02_file",data=data)return docs2.将问题向量化并搜索,拼接prompt,使用Agent(代理)
from langchain.agents import tool
from langchain.agents import load_tools
from langchain.agents import AgentType
from langchain.agents import initialize_agent
class testView(APIView):def get(self, request):query = request.query_params.get('query', None)llm = Tongyi()@tool('t1')def t1(query: str):"""当你需要查询数据库时才会使用这个工具"""client = MilvusClient(uri="http://127.0.0.1:19530", db_name="default")embedding = DashScopeEmbeddings(model="text-embedding-v1")question = embedding.embed_query(query)ret = client.search(collection_name='app02_file',data=[question],limit=3, # Max. number of search results to returnoutput_fields=["f_content"])promptTemplate = PromptTemplate.from_template("请根据下面内容总结回答\n{text}\n问题：{question}")text = ""for content in ret[0]:text = text + content["entity"]["f_content"]prompt = promptTemplate.format(text=text, question=query)print(prompt)return prompttools = [t1]agent = initialize_agent(tools,llm,agent=AgentType.STRUCTURED_CHAT_ZERO_SHOT_REACT_DESCRIPTION,verbose=True,)ret = agent.run(query)return Response({'response': ret})
