Comments (6)
I'm told that this is a known bug. In the meantime, you should use a different method to replicate the state - perhaps just use pjit.
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If replicating the arrays, they can be safely saved into the msgpack file. If calling unreplicate, I believe flax's behavior is to instruct Orbax to save using Tensorstore, which supports sharded arrays.
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To use the aggregate
option, you should either have numpy arrays, basic scalar types, or you can reshard your jax.Array
s to be replicated across all devices. This is pretty easy to do - just supply a sharding of None
instead. JAX documentation has lots of details
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Hi @cpgaffney1, thanks for the response. I am replicating the state prior to training with state = jax_utils.replicate(state)
. I also shard the batches during training with flax.training.common_utils.shard
. This error goes away if I call flax.jax_utils.unreplicate()
on the state before saving like so : ckpt = {'state': unreplicate(state), 'config': model.config}
. Is this supposed to happen?
from orbax.
jax_utils uses jax.device_put_replicated. When I run the following
import jax
replicated = jax.device_put_replicated(np.arange(32), jax.devices())
replicated.is_fully_replicated
is_fully_replicated
is actually False, which is surprising. Checking to see if this is expected behavior.
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Thanks. What would be the difference between saving the replicated state after pjit vs calling unreplicate() and saving as I'm doing now?
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