community: update RankLLM integration and fix LangChain deprecation

[Brayden Zhong (b8zhong)]

Community: update RankLLM integration and fix LangChain deprecation

• Description:

  • Removed ModelType enum (VICUNA, ZEPHYR, GPT) to align with RankLLM's latest implementation.
  • Updated chain({query}) to chain.invoke({query}) to resolve LangChain 0.1.0 deprecation warnings from Community: RankLLMRerank AttributeError (Handle list-based rerank results) #29840.

• Dependencies: No new dependencies added.

• Tests and Docs:

  • Updated RankLLM documentation (docs/docs/integrations/document_transformers/rankllm-reranker.ipynb).
  • Fixed LangChain usage in related code examples.

• Lint and Test:

  • Ran make format, make lint, and verified functionality after updates.
  • No breaking changes introduced.

Additional guidelines:
- Make sure optional dependencies are imported within a function.
- Please do not add dependencies to pyproject.toml files (even optional ones) unless they are required for unit tests.
- Most PRs should not touch more than one package.
- Changes should be backwards compatible.
- If you are adding something to community, do not re-import it in langchain.

If no one reviews your PR within a few days, please @-mention one of baskaryan, efriis, eyurtsev, ccurme, vbarda, hwchase17.

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Name	Status	Preview	Comments	Updated (UTC)
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[Brayden Zhong (b8zhong)]

ccurme (@ccurme) Hey! Thanks for reviewing my last PR! Wondering if you have any advice here? Weird that lint fails in 3.9 and 3.12...
Locally -- this is what I get:

uv run -p 3.9 --group lint ruff check docs/docs/integrations/document_transformers/rankllm-reranker.ipynb
Using CPython 3.9.21
Removed virtual environment at: .venv
Creating virtual environment at: .venv
Installed 84 packages in 63ms
All checks passed!

uv run -p 3.12 --group lint ruff check docs/docs/integrations/document_transformers/rankllm-reranker.ipynb
Using CPython 3.12.9
Removed virtual environment at: .venv
Creating virtual environment at: .venv
Installed 80 packages in 70ms
All checks passed!

[ccurme (ccurme)]

Can you give some context for this? There are many breaking changes here. Is the current version broken with the latest rank_llm? Is maintaining backward-compatibility feasible or worth it?

There are basically no tests for this abstraction so it's difficult to know the current state.

[ccurme (ccurme)]

For the linter: if things are set up correctly you should be able to run make format to auto-format and make lint to run the checks locally (see the contributing guide).

[ccurme (ccurme)]

Can you give some context for this? There are many breaking changes here. Is the current version broken with the latest rank_llm? Is maintaining backward-compatibility feasible or worth it?

There are basically no tests for this abstraction so it's difficult to know the current state.

Hi Brayden Zhong (@b8zhong), friendly ping on this.

[Brayden Zhong (b8zhong)]

Hi ccurme (@ccurme) sorry for the massive delay. I reset the code changes... only changes are to the notebook & some doc info. Let me know if you think it's ok to merge in.. ?

I'm not sure why the linting is complaining, it's about a line on the ipynb that's not an import I think.

[Brayden Zhong (b8zhong)]

Friendly bump; I know I was the one that forgot in the first place :)

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[Brayden Zhong (b8zhong)]

ccurme (@ccurme) Thanks for helping out here!