Bump keras from 3.11.3 to 3.12.0

[dependabot]

Bumps keras from 3.11.3 to 3.12.0.

Release notes

Sourced from keras's releases.

Keras 3.12.0

Highlights

Keras has a new model distillation API!

You now have access to an easy-to-use API for distilling large models into small models while minimizing performance drop on a reference dataset -- compatible with all existing Keras models. You can specify a range of different distillation losses, or create your own losses. The API supports multiple concurrent distillation losses at the same time.

Example:

# Load a model to distill
teacher = ...
# This is the model we want to distill it into
student = ...
Configure the process
distiller = Distiller(
teacher=teacher,
student=student,
distillation_losses=LogitsDistillation(temperature=3.0),
)
distiller.compile(
optimizer='adam',
loss='sparse_categorical_crossentropy',
metrics=['accuracy']
)
Train the distilled model
distiller.fit(x_train, y_train, epochs=10)

Keras supports GPTQ quantization!

GPTQ is now built into the Keras API. GPTQ is a post-training, weights-only quantization method that compresses a model to int4 layer by layer. For each layer, it uses a second-order method to update weights while minimizing the error on a calibration dataset.

Learn how to use it in this guide.

Example:

model = keras_hub.models.Gemma3CausalLM.from_preset("gemma3_1b")
gptq_config = keras.quantizers.GPTQConfig(
    dataset=calibration_dataset,
    tokenizer=model.preprocessor.tokenizer,
    weight_bits=4,
    group_size=128,
    num_samples=256,
    sequence_length=256,
    hessian_damping=0.01,
    symmetric=False,
</tr></table> 

... (truncated)

Commits

• adbfd13 Add warning to set_backend and more detailed example. (#21787)
• 70598b7 Fix typo in Distiller docstring
• eecd34f Fix: keras.ops.quantile works with tf graph execution (#21782)
• c2bc6cf Suport keras.op.view() to view the same data bitwise at a new dtype (#21763)
• 10b51ce Make confusion metrics compilable. (#21775)
• 18f79d6 Fix negative index handling in MultiHeadAttention attention_axes (#21721)
• 18e0364 Support for extracting volume patches (#21759)
• dc5e42c fix sas metrics in jax fit (#21765)
• 1ba3b8f Fix discretization discrepancy (#21769)
• 53987a7 Document that set_backend requires re-importing keras. (#21764)
• Additional commits viewable in compare view

Most Recent Ignore Conditions Applied to This Pull Request

Dependency Name	Ignore Conditions
keras	[>= 2.11.a, < 2.12]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.14%. Comparing base (23539e2) to head (c78789d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2795      +/-   ##
==========================================
+ Coverage   84.79%   85.14%   +0.34%     
==========================================
  Files         328      328              
  Lines       29497    29497              
  Branches     4964     4964              
==========================================
+ Hits        25013    25114     +101     
+ Misses       3061     2959     -102     
- Partials     1423     1424       +1     

see 3 files with indirect coverage changes

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@dependabot rebase