MongoDB 演示¶

本指南展示了如何直接使用我们由 MongoDB 支持的 DocumentStore 抽象。通过将节点放入 docstore 中，这使得您可以在同一底层 docstore 上定义多个索引，而不是在索引之间复制数据。

如果您在 colab 上打开此 Notebook，您可能需要安装 LlamaIndex 🦙。

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%pip install llama-index-storage-docstore-mongodb
%pip install llama-index-storage-index-store-mongodb
%pip install llama-index-llms-openai

%pip install llama-index-storage-docstore-mongodb %pip install llama-index-storage-index-store-mongodb %pip install llama-index-llms-openai

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!pip install llama-index

!pip install llama-index

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import nest_asyncio

nest_asyncio.apply()

import nest_asyncio nest_asyncio.apply()

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import logging
import sys
import os

logging.basicConfig(stream=sys.stdout, level=logging.INFO)
logging.getLogger().addHandler(logging.StreamHandler(stream=sys.stdout))

import logging import sys import os logging.basicConfig(stream=sys.stdout, level=logging.INFO) logging.getLogger().addHandler(logging.StreamHandler(stream=sys.stdout))

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from llama_index.core import SimpleDirectoryReader, StorageContext
from llama_index.core import VectorStoreIndex, SimpleKeywordTableIndex
from llama_index.core import SummaryIndex
from llama_index.core import ComposableGraph
from llama_index.llms.openai import OpenAI
from llama_index.core.response.notebook_utils import display_response
from llama_index.core import Settings

from llama_index.core import SimpleDirectoryReader, StorageContext from llama_index.core import VectorStoreIndex, SimpleKeywordTableIndex from llama_index.core import SummaryIndex from llama_index.core import ComposableGraph from llama_index.llms.openai import OpenAI from llama_index.core.response.notebook_utils import display_response from llama_index.core import Settings

下载数据¶

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!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'

!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¶

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reader = SimpleDirectoryReader("./data/paul_graham/")
documents = reader.load_data()

reader = SimpleDirectoryReader("./data/paul_graham/") documents = reader.load_data()

解析为节点¶

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from llama_index.core.node_parser import SentenceSplitter

nodes = SentenceSplitter().get_nodes_from_documents(documents)

from llama_index.core.node_parser import SentenceSplitter nodes = SentenceSplitter().get_nodes_from_documents(documents)

添加到 Docstore¶

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MONGO_URI = os.environ["MONGO_URI"]

MONGO_URI = os.environ["MONGO_URI"]

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from llama_index.storage.docstore.mongodb import MongoDocumentStore
from llama_index.storage.index_store.mongodb import MongoIndexStore

from llama_index.storage.docstore.mongodb import MongoDocumentStore from llama_index.storage.index_store.mongodb import MongoIndexStore

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storage_context = StorageContext.from_defaults(
    docstore=MongoDocumentStore.from_uri(uri=MONGO_URI),
    index_store=MongoIndexStore.from_uri(uri=MONGO_URI),
)

storage_context = StorageContext.from_defaults( docstore=MongoDocumentStore.from_uri(uri=MONGO_URI), index_store=MongoIndexStore.from_uri(uri=MONGO_URI), )

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storage_context.docstore.add_documents(nodes)

storage_context.docstore.add_documents(nodes)

定义多个索引¶

每个索引都使用相同的底层节点。

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summary_index = SummaryIndex(nodes, storage_context=storage_context)

summary_index = SummaryIndex(nodes, storage_context=storage_context)

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vector_index = VectorStoreIndex(nodes, storage_context=storage_context)

vector_index = VectorStoreIndex(nodes, storage_context=storage_context)

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keyword_table_index = SimpleKeywordTableIndex(
    nodes, storage_context=storage_context
)

keyword_table_index = SimpleKeywordTableIndex( nodes, storage_context=storage_context )

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# NOTE: the docstore still has the same nodes
len(storage_context.docstore.docs)

# NOTE: the docstore still has the same nodes len(storage_context.docstore.docs)

测试保存和加载¶

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# NOTE: docstore and index_store is persisted in MongoDB by default
# NOTE: here only need to persist simple vector store to disk
storage_context.persist()

# NOTE: docstore and index_store is persisted in MongoDB by default # NOTE: here only need to persist simple vector store to disk storage_context.persist()

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# note down index IDs
list_id = summary_index.index_id
vector_id = vector_index.index_id
keyword_id = keyword_table_index.index_id

# note down index IDs list_id = summary_index.index_id vector_id = vector_index.index_id keyword_id = keyword_table_index.index_id

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from llama_index.core import load_index_from_storage

# re-create storage context
storage_context = StorageContext.from_defaults(
    docstore=MongoDocumentStore.from_uri(uri=MONGO_URI),
    index_store=MongoIndexStore.from_uri(uri=MONGO_URI),
)

# load indices
summary_index = load_index_from_storage(
    storage_context=storage_context, index_id=list_id
)
vector_index = load_index_from_storage(
    storage_context=storage_context, index_id=vector_id
)
keyword_table_index = load_index_from_storage(
    storage_context=storage_context, index_id=keyword_id
)

from llama_index.core import load_index_from_storage # re-create storage context storage_context = StorageContext.from_defaults( docstore=MongoDocumentStore.from_uri(uri=MONGO_URI), index_store=MongoIndexStore.from_uri(uri=MONGO_URI), ) # load indices summary_index = load_index_from_storage( storage_context=storage_context, index_id=list_id ) vector_index = load_index_from_storage( storage_context=storage_context, index_id=vector_id ) keyword_table_index = load_index_from_storage( storage_context=storage_context, index_id=keyword_id )

测试一些查询¶

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chatgpt = OpenAI(temperature=0, model="gpt-3.5-turbo")

Settings.llm = chatgpt
Settings.chunk_size = 1024

chatgpt = OpenAI(temperature=0, model="gpt-3.5-turbo") Settings.llm = chatgpt Settings.chunk_size = 1024

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query_engine = summary_index.as_query_engine()
list_response = query_engine.query("What is a summary of this document?")

query_engine = summary_index.as_query_engine() list_response = query_engine.query("What is a summary of this document?")

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display_response(list_response)

display_response(list_response)

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query_engine = vector_index.as_query_engine()
vector_response = query_engine.query("What did the author do growing up?")

query_engine = vector_index.as_query_engine() vector_response = query_engine.query("What did the author do growing up?")

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display_response(vector_response)

display_response(vector_response)

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query_engine = keyword_table_index.as_query_engine()
keyword_response = query_engine.query(
    "What did the author do after his time at YC?"
)

query_engine = keyword_table_index.as_query_engine() keyword_response = query_engine.query( "What did the author do after his time at YC?" )

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display_response(keyword_response)

display_response(keyword_response)