Cohere

Cohere is a Canadian startup that provides natural language processing models that help companies improve human-machine interactions.

Installation and Setup

• Install the Python SDK :

pip install cohere

Get a Cohere api key and set it as an environment variable (COHERE_API_KEY)

Cohere langchain integrations

API	description	Endpoint docs	Import	Example usage
Chat	Build chat bots	chat	from langchain_community.chat_models import ChatCohere	cohere.ipynb
LLM	Generate text	generate	from langchain_community.llms import Cohere	cohere.ipynb
RAG Retriever	Connect to external data sources	chat + rag	from langchain.retrievers import CohereRagRetriever	cohere.ipynb
Text Embedding	Embed strings to vectors	embed	from langchain_community.embeddings import CohereEmbeddings	cohere.ipynb
Rerank Retriever	Rank strings based on relevance	rerank	from langchain.retrievers.document_compressors import CohereRerank	cohere.ipynb

Quick copy examples

Chat

from langchain_community.chat_models import ChatCohere
from langchain.schema import HumanMessage
chat = ChatCohere()
messages = [HumanMessage(content="knock knock")]
print(chat(messages))

LLM

from langchain_community.llms import Cohere

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

RAG Retriever

from langchain_community.chat_models import ChatCohere
from langchain.retrievers import CohereRagRetriever
from langchain_core.documents import Document

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

Text Embedding

from langchain_community.chat_models import ChatCohere
from langchain.retrievers import CohereRagRetriever
from langchain_core.documents import Document

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