[JAX] Update users of jax.tree.map() to be more careful about how they handle Nones. #983
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…y handle Nones. Due to a bug in JAX, JAX previously permitted `jax.tree.map(f, None, x)` where `x` is not `None`, effectively treating `None` as if it were pytree-prefix of any value. But `None` is a pytree container, and it is only a prefix of `None` itself. Fix user code that was relying on this bug. Most commonly, the fix is to write `jax.tree.map(lambda a, b: (None if a is None else f(a, b)), x, y, is_leaf=lambda t: t is None)`. PiperOrigin-RevId: 642455356
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[JAX] Update users of jax.tree.map() to be more careful about how they handle Nones.
Due to a bug in JAX, JAX previously permitted
jax.tree.map(f, None, x)wherexis notNone, effectively treatingNoneas if it were pytree-prefix of any value. ButNoneis a pytree container, and it is only a prefix ofNoneitself.Fix user code that was relying on this bug. Most commonly, the fix is to write
jax.tree.map(lambda a, b: (None if a is None else f(a, b)), x, y, is_leaf=lambda t: t is None).