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SpringFestQAt
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from langchain.vectorstores import Chroma
from langchain.embeddings.huggingface import HuggingFaceEmbeddings
import os
# 定义 Embeddings
embeddings = HuggingFaceEmbeddings(model_name="/root/data/model/sentence-transformer")
# 向量数据库持久化路径
persist_directory = 'data_base/vector_db/chroma'
# 加载数据库
vectordb = Chroma(
persist_directory=persist_directory,
embedding_function=embeddings
)
from LLM import InternLM_LLM
llm = InternLM_LLM(model_path = "/root/data/model/Shanghai_AI_Laboratory/internlm-chat-7b")
# llm.predict("你是谁")
from langchain.prompts import PromptTemplate
# 我们所构造的 Prompt 模板
template = """使用以下上下文来回答用户的问题。如果你不知道答案,就说你不知道。总是使用中文回答。
问题: {question}
可参考的上下文:
···
{context}
···
如果给定的上下文无法让你做出回答,请回答你不知道。
有用的回答:"""
# 调用 LangChain 的方法来实例化一个 Template 对象,该对象包含了 context 和 question 两个变量,在实际调用时,这两个变量会被检索到的文档片段和用户提问填充
QA_CHAIN_PROMPT = PromptTemplate(input_variables=["context","question"],template=template)
from langchain.chains import RetrievalQA
qa_chain = RetrievalQA.from_chain_type(llm,retriever=vectordb.as_retriever(),return_source_documents=True,chain_type_kwargs={"prompt":QA_CHAIN_PROMPT})
# 检索问答链回答效果
question = "什么是Dynamic Graph"
result = qa_chain({"query": question})
print("检索问答链回答 question 的结果:")
print(result["result"])
# 仅 LLM 回答效果
result_2 = llm(question)
print("大模型回答 question 的结果:")
print(result_2)
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