CohereEmbeddings 集成

使用 LangChain Python 集成 CohereEmbeddings 向量嵌入模型。

本指南将帮助您开始使用 Cohere 向量嵌入模型 using LangChain. For detailed documentation on CohereEmbeddings 功能和配置选项的详细文档，请参阅 API reference.

概述

集成详情

设置

要访问 Cohere embedding 模型，您需要创建一个 Cohere 账户，获取 API 密钥，并安装 langchain-cohere 集成包。

凭证

前往 cohere.com 注册 Cohere 并生成 API 密钥。 Once you’ve done this set the COHERE_API_KEY 环境变量：

import getpass
import os

if not os.getenv("COHERE_API_KEY"):
    os.environ["COHERE_API_KEY"] = getpass.getpass("请输入您的 Cohere API 密钥: ")

要启用模型调用的自动追踪，请设置您的 LangSmith API key:

os.environ["LANGSMITH_TRACING"] = "true"
os.environ["LANGSMITH_API_KEY"] = getpass.getpass("请输入您的 LangSmith API 密钥: ")

安装

LangChain 的 Cohere 集成位于 langchain-cohere 包中：

pip install -qU langchain-cohere

实例化

现在我们可以实例化模型对象并生成聊天补全：

from langchain_cohere import CohereEmbeddings

embeddings = CohereEmbeddings(
    model="embed-english-v3.0",
)

索引与检索

向量嵌入模型常用于检索增强生成 (RAG) 流程中, 既用于索引数据，也用于后续检索数据。 更详细的说明请参阅我们的 RAG tutorials.

下面展示如何使用 embeddings 对象来索引和检索数据。 在此示例中，我们将在 InMemoryVectorStore.

# 使用示例文本创建向量存储
from langchain_core.vectorstores import InMemoryVectorStore

text = "LangChain is the framework for building context-aware reasoning applications"

vectorstore = InMemoryVectorStore.from_texts(
    [text],
    embedding=embeddings,
)

# Use the vectorstore as a retriever
retriever = vectorstore.as_retriever()

# Retrieve the most similar text
retrieved_documents = retriever.invoke("What is LangChain?")

# show the retrieved document's content
retrieved_documents[0].page_content

'LangChain is the framework for building context-aware reasoning applications'

直接使用

Under the hood, the vectorstore and retriever implementations are calling embeddings.embed_documents(...) and embeddings.embed_query(...) to create embeddings for the text(s) used in from_texts and retrieval invoke operations, respectively.

You can directly call these methods to get embeddings for your own use cases.

Embed single texts

You can embed single texts or documents with embed_query:

single_vector = embeddings.embed_query(text)
print(str(single_vector)[:100])  # Show the first 100 characters of the vector

[-0.022979736, -0.030212402, -0.08886719, -0.08569336, 0.007030487, -0.0010671616, -0.033813477, 0.0

Embed multiple texts

You can embed multiple texts with embed_documents:

text2 = (
    "LangGraph is a library for building stateful, multi-actor applications with LLMs"
)
two_vectors = embeddings.embed_documents([text, text2])
for vector in two_vectors:
    print(str(vector)[:100])  # Show the first 100 characters of the vector

[-0.028869629, -0.030410767, -0.099121094, -0.07116699, -0.012748718, -0.0059432983, -0.04360962, 0.
[-0.047332764, -0.049957275, -0.07458496, -0.034332275, -0.057922363, -0.0112838745, -0.06994629, 0.

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API 参考

For detailed documentation on CohereEmbeddings 功能和配置选项的详细文档，请参阅 API reference.

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