[r/ML] Parax: Parametric Modeling in JAX + Equinox [P]

Summary

Parax is a new Python library built on JAX and Equinox, designed for "parameter-first modeling" in scientific applications. It addresses the challenge of attaching metadata like fixed states or prior distributions to parameters. The tool also simplifies the manipulation of parameters within deep hierarchical structures, which was previously complex using `eqx.tree_at`.

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