如何使用嵌入模型创建本地知识库Demo

为data目录下的txt文档用阿里百炼的文本嵌入模型创建一个本地知识库

import os
from llama_index.core import ,Settings, SimpleDirectoryReader, VectorStoreIndex
from llama_index.core.node_parser import SentenceSplitter
from llama_index.llms.dashscope import DashScope, DashScopeGenerationModels
from llama_index.embeddings.dashscope import DashScopeEmbedding, DashScopeTextEmbeddingModelsSettings.llm = DashScope(model_name=DashScopeGenerationModels.QWEN_MAX, api_key=os.getenv("DASHSCOPE_API_KEY"))
Settings.embed_model = DashScopeEmbedding(model_name=DashScopeTextEmbeddingModels.TEXT_EMBEDDING_V2)
documents = SimpleDirectoryReader("./data", required_exts=[".txt"]).load_data()
index = VectorStoreIndex.from_documents(documents, transformations=[SentenceSplitter(chunk_size=256)])
index.storage_context.persist(persist_dir='./doc_embeddings')

检索本地知识库，同时发给大模型

import osfrom llama_index.core import Settings, load_index_from_storage, StorageContext
from llama_index.llms.dashscope import DashScope, DashScopeGenerationModels
from llama_index.embeddings.dashscope import DashScopeEmbedding, DashScopeTextEmbeddingModels
Settings.llm = DashScope(model_name=DashScopeGenerationModels.QWEN_MAX,api_key=os.getenv("DASHSCOPE_API_KEY"))
Settings.embed_model = DashScopeEmbedding(model_name=DashScopeTextEmbeddingModels.TEXT_EMBEDDING_V2)
storage_context = StorageContext.from_defaults(persist_dir="./doc_embeddings")
index = load_index_from_storage(storage_context=storage_context)
query_engine = index.as_query_engine(streaming=True, similarity_top_k=5)
response = query_engine.query("你的问题？")
print(response)