Unwrap variables before passing to jax.jit.

[hertschuh]

Passing __jax_array__-implementing objects directly to jax.jit will no longer be supported.

[gemini-code-assist]

Summary of Changes

Hello @hertschuh, 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 compatibility update for JAX, preventing potential breakage in JIT-compiled code. By proactively unwrapping specific variable types, the changes ensure that Keras-RS components continue to function seamlessly with future versions of JAX, maintaining the stability and performance of the system.

Highlights

• JAX Compatibility Update: This pull request updates the codebase to align with an upcoming change in JAX where __jax_array__-implementing objects will no longer be directly supported when passed to jax.jit.
• Variable Unwrapping: The change explicitly unwraps trainable_variables and non_trainable_variables by accessing their .value attribute before they are passed to a JIT-compiled function, ensuring proper handling by JAX.

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[gemini-code-assist]

Code Review

This pull request addresses an upcoming breaking change in JAX by explicitly unwrapping Keras variables to their underlying arrays before passing them to jax.jit. The modification within the test suite is implemented cleanly using list comprehensions. The change is correct and well-contained. I have no further suggestions.