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# This file contains the changes to implement DDP training with the train.yaml config.
device: "$torch.device('cuda:' + os.environ['LOCAL_RANK'])" # assumes GPU # matches rank #
# wrap the network in a DistributedDataParallel instance, moving it to the chosen device for this process
network:
_target_: torch.nn.parallel.DistributedDataParallel
module: $@network_def.to(@device)
device_ids: ['@device']
find_unused_parameters: true
train_sampler:
_target_: DistributedSampler
dataset: '@train_dataset'
even_divisible: true
shuffle: true
train_dataloader#sampler: '@train_sampler'
train_dataloader#shuffle: false
val_sampler:
_target_: DistributedSampler
dataset: '@val_dataset'
even_divisible: false
shuffle: false
val_dataloader#sampler: '@val_sampler'
initialize:
- $import torch.distributed as dist
- $dist.init_process_group(backend='nccl')
- $torch.cuda.set_device(@device)
- $monai.utils.set_determinism(seed=123) # may want to choose a different seed or not do this here
run:
- '$@trainer.run()'
finalize:
- '$dist.is_initialized() and dist.destroy_process_group()'
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