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import abc
import torch.nn as nn
class Sharder(abc.ABC):
"""
This is an interface which allows user to create more advanced
sharding strategies that are not easily be composed by the
`ShardingSpec`.
:class:`torch.distributed._shard.sharding_plan.ShardingPlan` could
take an object of the `Sharder` and call `shard` to shard the module,
then replace the original module with sharded module returned.
"""
@abc.abstractmethod
def shard(self, module: nn.Module) -> nn.Module:
"""
Shard a module base on the implementation of this method, and
return the sharded version of the module.
Args:
module (:class:`torch.nn.Module`):
The module to apply sharding to.
Returns:
A :class:`torch.nn.Module` object that represents a module
that's already been sharded.
"""
pass
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