Add tree-mode support for nnx.shard_map#5238
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Extends nnx.shard_map with a `graph` parameter (defaulting to True for backward compatibility). When graph=False, shard_map operates in tree-mode using pytree-based state propagation, mirroring the existing tree-mode for nnx.jit. Tree-mode assumes referential transparency, doesn't propagate graph updates (only Variable updates are propagated), StateSharding is not supported / needed. Tree-mode offers a simpler, more JAX-native usage pattern that treats Modules as simple stateless pytrees, and only Variables state is automatically handled. PiperOrigin-RevId: 869026486
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Add tree-mode support for nnx.shard_map
Extends nnx.shard_map with a
graphparameter (defaulting to True forbackward compatibility). When graph=False, shard_map operates in tree-mode
using pytree-based state propagation, mirroring the existing tree-mode
for nnx.jit. Tree-mode assumes referential transparency, doesn't propagate graph updates (only Variable updates are propagated), StateSharding is not supported / needed.
Tree-mode offers a simpler, more JAX-native usage pattern that treats Modules as simple stateless pytrees, and only Variables state is automatically handled.