fix(trainer): import psutil to prevent NameError in _prepare_dataset

[alkinun]

Fixes #3777

[gemini-code-assist]

Summary of Changes

Hello @alkinun, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical NameError by introducing the necessary psutil import statements. This ensures the stability and correct execution of functions that rely on psutil, particularly within the _prepare_dataset context, thereby preventing runtime failures and improving the robustness of the trainer and tokenizer utilities.

Highlights

• NameError Fix: This pull request resolves a NameError that occurred in the _prepare_dataset function by ensuring the psutil library is correctly imported.
• psutil Import: The psutil library is now explicitly imported in both unsloth/tokenizer_utils.py and unsloth/trainer.py to make its functionalities available where needed.

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[gemini-code-assist]

Code Review

This pull request adds import psutil to two files to fix a reported NameError. While this likely resolves the issue, I've left a couple of comments regarding the placement of these imports to improve code maintainability. It would be great if you could take a look and clarify their usage.

[gemini-code-assist]

While adding import psutil might fix the NameError as the PR title suggests, psutil does not appear to be used directly in this file. To improve maintainability, it would be better to place the import closer to its usage if possible. If it's used indirectly (e.g., via an exec call), a comment explaining this would be very helpful for future developers.

[gemini-code-assist]

Similar to the other file, psutil is imported here but seems unused within this file's scope. For code clarity and maintainability, please consider moving this import to where psutil is actually called, or add a comment explaining the necessity of this import at the top level.

[danielhanchen]

Thanks so much! I added it also to rl.py