Llama doc fix

[maitry63]

This PR for adding the missing method in the llama_backbone.
Fixes: keras-team/keras-hub#2587

[gemini-code-assist]

Summary of Changes

Hello @maitry63, 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 enhances the siamese_contrastive example by refactoring its embedding network definition and adjusting the Siamese model's output to directly provide distance measurements, coupled with a new custom accuracy metric for improved evaluation. Concurrently, it addresses a documentation gap by adding a missing method to the LlamaBackbone API listing, ensuring comprehensive and up-to-date documentation.

Highlights

• Siamese Network Example Refactoring: The siamese_contrastive example was significantly refactored to define the embedding network as a dedicated function, improving code organization and readability.
• Siamese Model Architecture Update: The Siamese model's output layer was modified to directly return the Euclidean distance between embeddings, removing the final BatchNormalization and Dense layers that previously produced a sigmoid-activated probability.
• Custom Accuracy Metric Implementation: A new, custom accuracy function was introduced and integrated into the Siamese model's compilation, providing a more appropriate evaluation metric for the updated model output.
• LlamaBackbone Documentation Fix: The get_layout_map method was added to the API documentation for keras_hub.models.LlamaBackbone, addressing a missing entry.
• Metadata and Output Refresh: The "Last modified" dates in the example files were updated, and the training logs and image references in the notebook and markdown versions were refreshed to reflect the changes.

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Changelog

• examples/vision/ipynb/siamese_contrastive.ipynb
  • Updated last modified date in notebook metadata.
  • Added keras.layers import.
  • Refactored the embedding network definition into a dedicated function create_embedding_network with a docstring.
  • Modified the Siamese model construction to output the Euclidean distance directly, removing subsequent BatchNormalization and Dense layers.
  • Introduced a new accuracy function and updated the model compilation to use this custom metric.
  • Refreshed training logs and image paths within the notebook.
• examples/vision/md/siamese_contrastive.md
  • Updated last modified date.
  • Added keras.layers import.
  • Refactored the embedding network definition into a dedicated function create_embedding_network with a docstring.
  • Modified the Siamese model construction to output the Euclidean distance directly, removing subsequent BatchNormalization and Dense layers.
  • Introduced a new accuracy function and updated the model compilation to use this custom metric.
  • Refreshed training logs and image paths in the markdown file.
• examples/vision/siamese_contrastive.py
  • Updated last modified date.
  • Added keras.layers import.
  • Refactored the embedding network definition into a dedicated function create_embedding_network with a docstring.
  • Modified the Siamese model construction to output the Euclidean distance directly, removing subsequent BatchNormalization and Dense layers.
  • Introduced a new accuracy function and updated the model compilation to use this custom metric.
• scripts/hub_master.py
  • Added keras_hub.models.LlamaBackbone.get_layout_map to the list of documented methods.

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[gemini-code-assist]

Code Review

This pull request introduces two main changes. First, it adds the get_layout_map method to the LlamaBackbone documentation, which aligns with the PR's description. Second, it significantly refactors and improves the Siamese network example (siamese_contrastive). The model creation is now encapsulated in a function, making the code more modular. More importantly, the model and loss have been corrected to properly use contrastive loss on the Euclidean distance, and a custom accuracy metric has been added to reflect this change. These are excellent improvements that fix a correctness issue in the example.

I've only found a minor issue regarding the 'Last modified' date in the example files, which appears to be set to a future date.

[gemini-code-assist]

The 'Last modified' date is set to a future date. Please update it to the current date.

[gemini-code-assist]

The 'Last modified' date is set to a future date. Please update it to the current date.

[gemini-code-assist]

The 'Last modified' date is set to a future date. Please update it to the current date.