LlamaIndex Llms Integration: Langchain

Installation

1. Install the required Python packages:

   bashCopy

   %pip install llama-index-llms-langchain
   

Usage

Import Required Libraries

from langchain.llms import OpenAI
from llama_index.llms.langchain import LangChainLLM

Initialize LangChain LLM

To create an instance of LangChainLLM with OpenAI:

llm = LangChainLLM(llm=OpenAI())

Generate Streaming Response

To generate a streaming response, use the following code:

response_gen = llm.stream_complete("Hi this is")
for delta in response_gen:
    print(delta.delta, end="")

LLM Implementation example

https://docs.llamaindex.ai/en/stable/examples/llm/langchain/