如果您在colab上打开这个笔记本,您可能需要安装LlamaIndex 🦙。
%pip install llama-index-vector-stores-weaviate
!pip install llama-index
import os
import openai
os.environ["OPENAI_API_KEY"] = ""
openai.api_key = os.environ["OPENAI_API_KEY"]
import logging
import sys
logging.basicConfig(stream=sys.stdout, level=logging.INFO)
logging.getLogger().addHandler(logging.StreamHandler(stream=sys.stdout))
import weaviate
# 云端
cluster_url = ""
api_key = ""
client = weaviate.connect_to_wcs(
cluster_url=cluster_url,
auth_credentials=weaviate.auth.AuthApiKey(api_key),
)
# 本地
# client = connect_to_local()
from llama_index.core import VectorStoreIndex, SimpleDirectoryReader
from llama_index.vector_stores.weaviate import WeaviateVectorStore
from IPython.display import Markdown, display
下载数据
!mkdir -p 'data/paul_graham/'
!wget 'https://raw.githubusercontent.com/run-llama/llama_index/main/docs/docs/examples/data/paul_graham/paul_graham_essay.txt' -O 'data/paul_graham/paul_graham_essay.txt'
# 加载文档
documents = SimpleDirectoryReader("./data/paul_graham").load_data()
from llama_index.core import StorageContext
# 如果你想以后加载索引,请确保给它一个名称!
vector_store = WeaviateVectorStore(
weaviate_client=client, index_name="LlamaIndex"
)
storage_context = StorageContext.from_defaults(vector_store=vector_store)
index = VectorStoreIndex.from_documents(
documents, storage_context=storage_context
)
# 注意:你也可以选择手动定义一个索引名称。
# index_name = "test_prefix"
# vector_store = WeaviateVectorStore(weaviate_client=client, index_name=index_name)
# 将日志级别设置为DEBUG,以获得更详细的输出
query_engine = index.as_query_engine()
response = query_engine.query("作者在成长过程中做了什么?")
display(Markdown(f"<b>{response}</b>"))
在这里,我们使用与创建初始索引时相同的索引名称。这样可以阻止它被自动生成,并使我们能够轻松地重新连接到它。
cluster_url = ""
api_key = ""
client = weaviate.connect_to_wcs(
cluster_url=cluster_url,
auth_credentials=weaviate.auth.AuthApiKey(api_key),
)
# 本地
# client = weaviate.connect_to_local()
vector_store = WeaviateVectorStore(
weaviate_client=client, index_name="LlamaIndex"
)
loaded_index = VectorStoreIndex.from_vector_store(vector_store)
# 将日志级别设置为DEBUG,以获得更详细的输出
query_engine = loaded_index.as_query_engine()
response = query_engine.query("What happened at interleaf?")
display(Markdown(f"<b>{response}</b>"))
让我们插入一个虚拟文档,并尝试进行过滤,以便只返回该文档。
from llama_index.core import Document
doc = Document.example()
print(doc.metadata)
print("-----")
print(doc.text[:100])
loaded_index.insert(doc)
from llama_index.core.vector_stores import ExactMatchFilter, MetadataFilters
filters = MetadataFilters(
filters=[ExactMatchFilter(key="filename", value="README.md")]
)
query_engine = loaded_index.as_query_engine(filters=filters)
response = query_engine.query("What is the name of the file?")
display(Markdown(f"<b>{response}</b>"))
您可以使用delete_index
函数删除向量存储创建的索引。
vector_store.delete_index()
vector_store.delete_index() # 再次调用该函数不会有任何作用
您必须确保关闭客户端连接:
client.close()