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# Copyright (c) OpenMMLab. All rights reserved.
from .hook import HOOKS, Hook
@HOOKS.register_module()
class DistSamplerSeedHook(Hook):
"""Data-loading sampler for distributed training.
When distributed training, it is only useful in conjunction with
:obj:`EpochBasedRunner`, while :obj:`IterBasedRunner` achieves the same
purpose with :obj:`IterLoader`.
"""
def before_epoch(self, runner):
if hasattr(runner.data_loader.sampler, 'set_epoch'):
# in case the data loader uses `SequentialSampler` in Pytorch
runner.data_loader.sampler.set_epoch(runner.epoch)
elif hasattr(runner.data_loader.batch_sampler.sampler, 'set_epoch'):
# batch sampler in pytorch warps the sampler as its attributes.
runner.data_loader.batch_sampler.sampler.set_epoch(runner.epoch)
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