Xtr

[riyazbhat]

Pull Request

What does this PR do?

Integrate XTR Model Support and Modified colbertv2 Indexing

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Description

Describe the changes proposed by this PR below to give the reviewer context below ↓↓↓

This pull request focuses on integrating support for the XTR model, a highly efficient multi-vector model, and modifying the colbertv2 indexing to seamlessly incorporate this new model. Below are the key changes and additions made in this PR:

1. Implemented XTR, a cutting-edge multi-vector model renowned for its efficiency and effectiveness. This implementation is based on the research paper.
2. Adapted the colbertv2 indexing functionality to seamlessly integrate with the newly introduced XTR model.
3. Made the model weights for the implemented XTR model readily accessible on the Hugging Face model repository, checkpoint.
4. Notebook for indexing and retrieval is available here.
5. It's worth noting that while this PR implements the XTR model based on the available research paper, the full official implementation from the authors is yet to be released.
6. As of the latest update, the authors have only provided the inference code for the XTR model on 8th April 2024. Therefore, this implementation serves as an early integration of the XTR model into our system, pending the official release of the complete implementation from the authors.

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Checklist

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• Tag an issue or issues this PR addresses.
• Added description of changes proposed.
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• Version bumped as appropriate.
• New classes, methods, and functions documented.
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• Code cleaned up and commented out code removed.
• Tests added to ensure all functionalities tested at >= 60% unit test coverage (see here).
• Code cleaned up and commented out code removed.
• Release created as needed after merging.