Keras ModelCheckpoint Path Update for Weight Serialization

[poacosta]

Keras ModelCheckpoint Path Update for Weight Serialization

Overview

Updates ModelCheckpoint filepath to comply with Keras weight serialization requirements by appending .weights.h5 extension.

Technical Context

The ModelCheckpoint callback requires specific file extensions when save_weights_only=True is enabled.

From:

filepath='./training_checkpoints/ckpt_{epoch}'

To:

filepath='./training_checkpoints/ckpt_{epoch}.weights.h5'

Implementation Details

• Maintains existing epoch-based checkpoint pattern using {epoch} placeholder
• Adds required .weights.h5 extension
• Preserves checkpoint directory structure and naming convention

Validation

• Checkpoint saving executes without ValueError
• Weight files load correctly into model instances
• Per-epoch checkpoint pattern verified

Impact

No changes to model architecture, training dynamics, or checkpoint frequency. Purely file format compliance update for Keras weight serialization requirements.

References

• https://keras.io/api/models/model_saving_apis/weights_saving_and_loading/

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Preview

Preview and run these notebook edits with Google Colab:

• site/en/tutorials/audio/music_generation.ipynb

Rendered notebook diffs available on ReviewNB.com.

Format and style

Use the TensorFlow docs notebook tools to format for consistent source diffs and lint for style:

$ python3 -m pip install -U --user git+https://github.com/tensorflow/docs

$ python3 -m tensorflow_docs.tools.nbfmt notebook.ipynb

$ python3 -m tensorflow_docs.tools.nblint --arg=repo:tensorflow/docs notebook.ipynb

If commits are added to the pull request, synchronize your local branch: git pull origin fix/train-model-bug