Relyt

Relyt is a cloud native data warehousing service that is designed to analyze large volumes of data online.

Relyt is compatible with the ANSI SQL 2003 syntax and the PostgreSQL and Oracle database ecosystems. Relyt also supports row store and column store. Relyt processes petabytes of data offline at a high performance level and supports highly concurrent online queries.

本笔记本展示了如何使用与 Relyt 向量数据库相关的功能。要运行，您应该有一个 Relyt 实例正在运行：

使用 Relyt 向量数据库。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 参考：TextLoader | FakeEmbeddings | LangChain |CharacterTextSplitter

拆分文档并通过调用社区API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)

通过设置相关环境变量连接到 Relyt。

export PG_HOST={your_relyt_hostname}
export PG_PORT={your_relyt_port} # Optional, default is 5432
export PG_DATABASE={your_database} # Optional, default is postgres
export PG_USER={database_username}
export PG_PASSWORD={database_password}

然后将你的嵌入和文档存储到Relyt

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.

向量存储概念指南
向量存储操操作指南

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