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[trax] Explicitly set jax_pmap_shmap_merge=False.
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jax_pmap_shmap_merge=True.jax_pmap_shmap_merge=False.
`trainer._multi_device_update_fn` uses `jax.pmap` and when `jax_pmap_shmap_merge=True`, `jax.pmap` requires inputs be explicitly sharded as the underlying `jax.jit` expects. This would need to be fixed if `jax_pmap_shmap_merge=True`. PiperOrigin-RevId: 811810947
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[trax] Explicitly set
jax_pmap_shmap_merge=False.trainer._multi_device_update_fnusesjax.pmapand whenjax_pmap_shmap_merge=True,jax.pmaprequires inputs be explicitly sharded as the underlyingjax.jitexpects.This would need to be fixed if
jax_pmap_shmap_merge=True.