Unlocking Low-Level Control: Customizing Keras Training Loops with JAX

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Do you want the speed and functional power of JAX without losing the high-level convenience of model.fit? In this video, Google ML Developer Advocate Yufeng Guo (@yufengg) explains how Keras implements the principle of Progressive Disclosure of Complexity. Learn how to take full control of your learning algorithms by overriding the train_step() and test_step() methods while keeping access to built-in callbacks, distribution support, and evaluation tools. What You’ll Learn: - Why override train_step instead of writing a loop from scratch? - Understanding how to handle trainable variables, non-trainable variables, and optimizer states in a functional environment. - Creating a compute_loss_and_updates function to manage forward passes and auxiliary data. - Using jax.value_and_grad to compute gradients and losses simultaneously. - Updating evaluation metrics using stateless_update_state. Chapters: 0:00 - Introduction & The Default model.fit() 0:18 - Customizing Keras Training Loops 0:46 - Overriding train_step() 1:14 - Setting up the JAX Backend 1:26 - The Stateless train_step 2:11 - Stateless Loss Computation 3:04 - Taking Gradients in train_step 4:06 - How to pass around non-trainable variables 4:43 - Updating the Model Weights 5:05 - Handling Metrics 5:21 - Custom Evaluation Loops (overriding test_step) Resources: Complete Code Example →https://goo.gle/4eeSvlD Keras Documentation → https://goo.gle/42Ebpv0 Keras Developer Guides →https://goo.gle/4um97N3 Subscribe to G

Published 2026-04-30 · Watch on YouTube ↗
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