Optax

Optax is a gradient processing and optimization library designed for JAX. It provides a rich set of optimizers (Adam, SGD, etc.), learning rate schedules, and gradient transformations that can be composed to build custom optimization pipelines. It's actively developed by DeepMind/Google, with the current stable version being 0.2.8, and follows a release cadence tied to JAX ecosystem developments, often releasing minor versions for bug fixes and new features.