huggingface: Reduce disk footprint by 95% by making large dependencies optional #31268
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Description:
langchain_huggingfacehas a very large installation size of around 600 MB (on a Mac with Python 3.11). This is due to its dependency onsentence-transformers, which in turn depends ontorch, which is 320 MB all by itself. Similarly, the depedency ontransformersadds another set of heavy dependencies. With those dependencies removed, the installation oflangchain_huggingfaceonly takes up ~26 MB. This is only 5 % of the full installation!These libraries are not necessary to use
langchain_huggingface's API wrapper classes, only for local inferences/embeddings. All import statements for those two libraries already have import guards in place (try/catch with a helpful "please install x" message).This PR therefore moves those two libraries to an optional dependency group
full. So apip install langchain_huggingfacewill only install the lightweight version, and apip install "langchain_huggingface[full]"will install all dependencies.I know this may break existing code, because
sentence-transformersandtransformersare now no longer installed by default. Given that users will see helpful error messages when that happens, and the major impact of this small change, I hope that you will still consider this PR.Dependencies: No new dependencies, but new optional grouping.