community: Fix rank-llm import paths for new 0.20.3 version

[tymzar]

PR title: "community: Fix rank-llm import paths for new 0.20.3 version"

• The "community" package is being modified to handle updated import paths for the new rank-llm version.

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Description

This PR updates the import paths for the rank-llm package to account for changes introduced in version 0.20.3. The changes ensure compatibility with both pre- and post-revamp versions of rank-llm, specifically version 0.12.8. Conditional imports are introduced based on the detected version of rank-llm to handle different path structures for VicunaReranker, ZephyrReranker, and SafeOpenai.

Issue

RankLLMRerank usage throws an error when used GPT (not only) when rank-llm version is > 0.12.8 - #29156

Dependencies

This change relies on the packaging and pkg_resources libraries to handle version checks.

Twitter handle

@tymzar

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 11, 2025 11:30pm

[ccurme]

Thanks for maintaining backward compatibility!