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Cohere

Cohere 是一家提供自然语言处理模型的加拿大初创公司 该模型帮助公司改善人机交互。

安装和设置​

  • 安装 Python SDK :
pip install langchain-cohere

获取一个 Cohere api 密钥 并将其设置为环境变量 (COHERE_API_KEY)

Cohere LangChain 集成​

API描述端点文档导入示例用法
聊天构建聊天机器人聊天from langchain_cohere import ChatCoherecohere.ipynb
大型语言模型生成文本生成from langchain_cohere.llms import Coherecohere.ipynb
RAG 检索器连接到外部数据源聊天 + RAGfrom langchain.retrievers import CohereRagRetrievercohere.ipynb
文本嵌入将字符串嵌入到向量嵌入from langchain_cohere import CohereEmbeddingscohere.ipynb
重新排序检索器根据相关性对字符串进行排序重新排序from langchain.retrievers.document_compressors import CohereRerankcohere.ipynb

快速复制示例​

聊天​

from langchain_cohere import ChatCohere
from langchain_core.messages import HumanMessage
chat = ChatCohere()
messages = [HumanMessage(content="knock knock")]
print(chat.invoke(messages))

使用 Cohere 聊天模型

大型语言模型​

from langchain_cohere.llms import Cohere

llm = Cohere()
print(llm.invoke("Come up with a pet name"))

使用 Cohere (遗留) LLM 模型

工具调用​

from langchain_cohere import ChatCohere
from langchain_core.messages import (
    HumanMessage,
    ToolMessage,
)
from langchain_core.tools import tool

@tool
def magic_function(number: int) -> int:
    """Applies a magic operation to an integer

    Args:
        number: Number to have magic operation performed on
    """
    return number + 10

def invoke_tools(tool_calls, messages):
    for tool_call in tool_calls:
        selected_tool = {"magic_function":magic_function}[
            tool_call["name"].lower()
        ]
        tool_output = selected_tool.invoke(tool_call["args"])
        messages.append(ToolMessage(tool_output, tool_call_id=tool_call["id"]))
    return messages

tools = [magic_function]

llm = ChatCohere()
llm_with_tools = llm.bind_tools(tools=tools)
messages = [
    HumanMessage(
        content="What is the value of magic_function(2)?"
    )
]

res = llm_with_tools.invoke(messages)
while res.tool_calls:
    messages.append(res)
    messages = invoke_tools(res.tool_calls, messages)
    res = llm_with_tools.invoke(messages)

print(res.content)

可以通过将必要的工具绑定到上述的 LLM 来进行 Cohere LLM 的工具调用。 另一种选择是支持使用 ReAct 代理进行多跳工具调用，如下所示。

ReAct 代理​

该代理基于论文 ReAct: Synergizing Reasoning and Acting in Language Models。

from langchain_community.tools.tavily_search import TavilySearchResults
from langchain_cohere import ChatCohere, create_cohere_react_agent
from langchain_core.prompts import ChatPromptTemplate
from langchain.agents import AgentExecutor

llm = ChatCohere()

internet_search = TavilySearchResults(max_results=4)
internet_search.name = "internet_search"
internet_search.description = "Route a user query to the internet"

prompt = ChatPromptTemplate.from_template("{input}")

agent = create_cohere_react_agent(
    llm,
    [internet_search],
    prompt
)

agent_executor = AgentExecutor(agent=agent, tools=[internet_search], verbose=True)

agent_executor.invoke({
    "input": "In what year was the company that was founded as Sound of Music added to the S&P 500?",
})

ReAct代理可以用于按顺序调用多个工具。

RAG检索器​

from langchain_cohere import ChatCohere
from langchain.retrievers import CohereRagRetriever
from langchain_core.documents import Document

rag = CohereRagRetriever(llm=ChatCohere())
print(rag.invoke("What is cohere ai?"))

使用Cohere RAG检索器

文本嵌入​

from langchain_cohere import CohereEmbeddings

embeddings = CohereEmbeddings(model="embed-english-light-v3.0")
print(embeddings.embed_documents(["This is a test document."]))

使用Cohere 文本嵌入模型

重新排序器​

使用Cohere 重新排序器

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