Relyt

Relyt 是一种云原生数据仓库服务，旨在在线分析海量数据。

Relyt 兼容 ANSI SQL 2003 语法以及 PostgreSQL 和 Oracle 数据库生态。Relyt 同时支持行存储和列存储。Relyt 以高并发的用户在线查询能力支持 PB 级数据的离线高性能处理。

本 Notebook 展示了如何使用与 Relyt 向量数据库相关的功。要运行它，您应该已经启动并运行了一个 Relyt 实例：

使用 Relyt Vector Database。点击此处快速部署。

%pip install "pgvecto_rs[sdk]" langchain-community

from langchain_community.document_loaders import TextLoader
from langchain_community.embeddings.fake import FakeEmbeddings
from langchain_community.vectorstores import Relyt
from langchain_text_splitters import CharacterTextSplitter

API Reference:TextLoader | FakeEmbeddings | Relyt | CharacterTextSplitter

调用社区 API 分割文档并获取嵌入

loader = TextLoader("../../how_to/state_of_the_union.txt")
documents = loader.load()
text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=0)
docs = text_splitter.split_documents(documents)

embeddings = FakeEmbeddings(size=1536)

通过设置相关的环境变量来连接 Relyt。

export PG_HOST={your_relyt_hostname}
export PG_PORT={your_relyt_port} # 可选，默认为 5432
export PG_DATABASE={your_database} # 可选，默认为 postgres
export PG_USER={database_username}
export PG_PASSWORD={database_password}

然后将您的 embeddings 和 documents 存储到 Relyt 中

import os

connection_string = Relyt.connection_string_from_db_params(
    driver=os.environ.get("PG_DRIVER", "psycopg2cffi"),
    host=os.environ.get("PG_HOST", "localhost"),
    port=int(os.environ.get("PG_PORT", "5432")),
    database=os.environ.get("PG_DATABASE", "postgres"),
    user=os.environ.get("PG_USER", "postgres"),
    password=os.environ.get("PG_PASSWORD", "postgres"),
)

vector_db = Relyt.from_documents(
    docs,
    embeddings,
    connection_string=connection_string,
)

查询和检索数据

query = "What did the president say about Ketanji Brown Jackson"
docs = vector_db.similarity_search(query)

print(docs[0].page_content)

Tonight. I call on the Senate to: Pass the Freedom to Vote Act. Pass the John Lewis Voting Rights Act. And while you’re at it, pass the Disclose Act so Americans can know who is funding our elections. 

Tonight, I’d like to honor someone who has dedicated his life to serve this country: Justice Stephen Breyer—an Army veteran, Constitutional scholar, and retiring Justice of the United States Supreme Court. Justice Breyer, thank you for your service. 

One of the most serious constitutional responsibilities a President has is nominating someone to serve on the United States Supreme Court. 

And I did that 4 days ago, when I nominated Circuit Court of Appeals Judge Ketanji Brown Jackson. One of our nation’s top legal minds, who will continue Justice Breyer’s legacy of excellence.

Vector store conceptual guide
Vector store how-to guides

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