UDAPDR minor fixes

[kakugawa]

Pull Request

What does this PR do?

Closes #512

Description

• Created a conda environment.yml file.
• Fixed the devices argument.
• Made the boolean arguments optional.
• Fixed experiment in generate_ColBERTv2_zeroshot_results.py.
• Add another check to found_query in train_reranker.py.
• Don't recalculate zero_shot_ranking_filename.
• Get the best_checkpoint_path from the Trainer.
• Fixed old dataset paths.
• Auto-create required directories.

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Versioning

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Releases

After Merging

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• Not merging to master or VERSION not updated

Checklist

Review the following and mark as completed:

• Tag an issue or issues this PR addresses.
• Added description of changes proposed.
• Review requested as appropriate.
• Version bumped as appropriate.
• New classes, methods, and functions documented.
• Documentation for modified code is updated.
• Built documentation to confirm it renders as expected (see here).
• 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.