langchain installtion issue: retrievers subpackge not installing, llms.bedrok does appear neither ConversationRetrievalChain from langchain.chains

Question

After I install langchain with pip install I can not find the following sub-packages/objects:

• retrievers subpackage not installing and directory langchain/retrievers not appearing at all
• AmazonKendraRetriever does no appear of ourse
• bedrock does not appear inside directory langchain/llms neither in init
• ConversationLRetrievalChain does not appear under langchain/chains or init

I tried in requirements.txt the below combinations, but none solved the issue

requirements.txt

langchain
langchain[all]
langchain.retrievers

I'm pining a --python-version 311 and also --platform manylinux1X86_64 to pip install to have no issues with pydantic.

How to solve this issue ?? Thanks

Answer 1

The issue is that limiting the installation as I did above will always left outside libraries that have no wheels. So this method should not be used unless you are aware that all subpackges do have wheels. Use a contanarized lambda layer instead was the solution