langchain-google-vertexai
This package contains the LangChain integrations for Google Cloud generative models.
Installation
pip install -U langchain-google-vertexai
Chat Models
ChatVertexAI class exposes models such as gemini-pro and chat-bison.
To use, you should have Google Cloud project with APIs enabled, and configured credentials. Initialize the model as:
from langchain_google_vertexai import ChatVertexAI
llm = ChatVertexAI(model_name="gemini-pro")
llm.invoke("Sing a ballad of LangChain.")
You can use other models, e.g. chat-bison:
from langchain_google_vertexai import ChatVertexAI
llm = ChatVertexAI(model_name="chat-bison", temperature=0.3)
llm.invoke("Sing a ballad of LangChain.")
Multimodal inputs
Gemini vision model supports image inputs when providing a single chat message. Example:
from langchain_core.messages import HumanMessage
from langchain_google_vertexai import ChatVertexAI
llm = ChatVertexAI(model_name="gemini-pro-vision")
message = HumanMessage(
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