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langchain-cos-vectors

腾讯云 COS 向量存储桶(CosVectors)的 LangChain VectorStore 集成。

CosVectors 是腾讯云对象存储(COS)推出的向量存储桶产品,支持向量的存储、检索和相似度搜索。

安装

pip install langchain-cos-vectors

快速开始

from langchain_cos_vectors import CosVectors
from langchain_openai import OpenAIEmbeddings

# 方式一:通过构造函数创建
cos_vectors = CosVectors(
    embedding=OpenAIEmbeddings(),
    cos_config={
        "Region": "ap-beijing",
        "SecretId": "your-secret-id",
        "SecretKey": "your-secret-key",
    },
    bucket="your-vector-bucket",
    index="your-index",
    endpoint="vectors.ap-beijing.coslake.com",  # 可选,自定义 Endpoint
)

# 添加文本
ids = cos_vectors.add_texts(
    texts=["hello world", "foo bar"],
    metadatas=[{"source": "test"}, {"source": "test"}],
)

# 相似度搜索
docs = cos_vectors.similarity_search("hello", k=2)

# 方式二:通过 from_texts 快速创建
cos_vectors = CosVectors.from_texts(
    texts=["hello", "world"],
    embedding=OpenAIEmbeddings(),
    cos_region="ap-beijing",
    cos_secret_id="your-secret-id",
    cos_secret_key="your-secret-key",
    bucket="my-vector-bucket",
    index="my-index",
    endpoint="vectors.ap-beijing.coslake.com",
)

环境变量

也可以通过环境变量配置认证信息:

export COS_SECRET_ID="your-secret-id"
export COS_SECRET_KEY="your-secret-key"
export COS_REGION="ap-beijing"

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