Use Pathways _transfer_to_sharding for resharding in experimental reshard API.
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…eshard API. The experimental `reshard` function now leverages `pw_jax.jaxlib_pathways._transfer_to_shardings` for array resharding (if available), removing the custom `ReshardingPlanWrapper` and its dependency on `plugin_executable`. This simplifies the implementation and aligns with internal Pathways mechanisms. The `cache_resharding_plans` option has also been removed. This requires the latest JAX version because the ifrt_proxy API for ReshardArrays was recently added. To ensure backwards compatibility, if `_transfer_to_sharding` is not supported, the sidechannel API will be used. PiperOrigin-RevId: 852643657
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Use Pathways
_transfer_to_shardingfor resharding in experimental reshard API.The experimental
reshardfunction now leveragespw_jax.jaxlib_pathways._transfer_to_shardingsfor array resharding (if available), removing the customReshardingPlanWrapperand its dependency onplugin_executable. This simplifies the implementation and aligns with internalPathways mechanisms. The
cache_resharding_plansoption has also been removed.This requires the latest JAX version because the ifrt_proxy API for ReshardArrays was recently added.
To ensure backwards compatibility, if
_transfer_to_shardingis not supported, the sidechannel API will be used.