LangChain

February 2024

In this page, I will share my experiences learning LangChain.

Some info on my setup:

• Windows 11 Home, x64-based processor

• Python 3.11.5

• langchain==0.1.7

• langchain-community==0.0.20

• langchain-core==0.1.23

• langchain-openai==0.0.6

• langsmith==0.0.87

Reference Documentation Used:

• https://python.langchain.com/docs/get_started/installation

• https://python.langchain.com/docs/get_started/quickstart

There were a couple of issues I encountered right off the gate:

1. Rate Limit on OpenAI API: As my first time working with OpenAI API I was not familiar with this concept. I went to my account page on openAI (https://platform.openai.com/), created an API key and also had to fund the account under the settings and then billing option.

2. Document Loader import error (Windows specific): 

The second issue was on the 'Retrieval Chain' Section of the quickstart, speficically on this import:

from langchain_community.document_loaders import WebBaseLoader

The error I received was ModuleNotFoundError: No module named 'pwd'

The solution to this was found in these 2 places:

https://github.com/langchain-ai/langchain/issues/17514

https://github.com/langchain-ai/langchain/issues/17651

  The solution I went with was to modify the code in the 'pebblo.py' file (lines 262 through 268 with the conditional import pwd) and commented out line 5 (import pwd). 

Summary:

Overall I found the Quikckstart as a helpful start on Langchain