Replace deprecated WANDB_LOG_MODEL=true with end in HF optimize notebook

[johndmulhausen]

Problem

Optimize_Hugging_Face_models_with_Weights_&_Biases.ipynb sets %env WANDB_LOG_MODEL=true. Modern transformers no longer accepts true — the WandbLogModel enum only accepts end, checkpoint, or false, so running the notebook crashes with:

ValueError: 'true' is not a valid WandbLogModel

(with a DeprecationWarning telling users to use 'end' or 'checkpoint' instead).

Fix

• Code cell: %env WANDB_LOG_MODEL=true → %env WANDB_LOG_MODEL=end
• Markdown tip: updated to say set WANDB_LOG_MODEL to end (mentioning checkpoint as the alternative for per-checkpoint logging), and fixed the "varilable" typo on the same line

No other changes; the notebook JSON is otherwise untouched.

Verification

Against the current transformers release in a fresh venv:

>>> WandbLogModel('end')         # ok
>>> WandbLogModel('checkpoint')  # ok
>>> WandbLogModel('true')        # raises, as reported in the issues

Notebook validated with nbformat.validate(...) (nbformat 4) — passes. grep confirms no remaining WANDB_LOG_MODEL=true in this notebook.

Fixes #572
Fixes #598

🤖 Generated with Claude Code

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Pull request overview

Updates the Hugging Face optimization Colab notebook to use the current transformers-supported WANDB_LOG_MODEL values, preventing runtime failure caused by the deprecated true setting.

Changes:

• Replaced %env WANDB_LOG_MODEL=true with %env WANDB_LOG_MODEL=end to match WandbLogModel enum expectations.
• Updated the related markdown tip to recommend end (and mention checkpoint), and fixed a spelling typo (“varilable” → “variable”).

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