Update users of jax.tree.map() to be more careful about how they hand… #753
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…le 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).
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Wonderful stuff! Thank you for the fix Peter :) |
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…le 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).