wehub-resource-sync
100 lines
3.5 KiB
Python
100 lines
3.5 KiB
Python
# Copyright (c) ModelScope Contributors. All rights reserved.
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import torch
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import torch.distributed as dist
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from torch.utils.data import DataLoader
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from typing import Optional
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from swift.utils import to_device
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class BatchSamplerShard:
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def __init__(
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self,
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total_samples: int,
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batch_size: int,
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shuffle: bool,
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drop_last: bool,
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data_seed: Optional[int],
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tp_size: int = 1,
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group_by_length: bool = False,
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lengths=None,
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):
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self.tp_size = tp_size
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self.total_samples = total_samples // self.world_size
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self.batch_size = batch_size
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self.shuffle = shuffle
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self.drop_last = drop_last
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self.base_seed = data_seed or 0
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self.curr_seed = self.base_seed
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self.group_by_length = group_by_length
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if group_by_length and not shuffle:
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raise ValueError('shuffle must be True when group_by_length is True')
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self.lengths = lengths
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if self.lengths is not None:
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self.lengths = [max(length) if isinstance(length, list) else length for length in self.lengths]
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@property
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def rank(self):
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return (dist.get_rank() // self.tp_size) if dist.is_initialized() else 0
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@property
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def world_size(self):
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return (dist.get_world_size() // self.tp_size) if dist.is_initialized() else 1
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def __iter__(self):
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if self.shuffle:
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generator = torch.Generator()
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generator.manual_seed(self.curr_seed)
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if self.group_by_length:
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from transformers.trainer_pt_utils import get_length_grouped_indices
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total_idx = get_length_grouped_indices(
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self.lengths, self.batch_size * self.world_size, generator=generator)
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else:
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total_idx = torch.randperm(self.total_samples * self.world_size, generator=generator).tolist()
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total_idx = total_idx[self.rank::self.world_size]
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else:
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total_idx = range(self.rank, self.total_samples * self.world_size, self.world_size)
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batch = []
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# Last batch if not complete will be dropped.
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for idx in total_idx:
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batch.append(idx)
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if len(batch) == self.batch_size:
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yield batch
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batch = []
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if not self.drop_last and len(batch) > 0:
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yield batch
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return
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def set_epoch(self, epoch: int):
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self.curr_seed = self.base_seed + epoch
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def __len__(self) -> int:
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if self.drop_last:
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return self.total_samples // self.batch_size
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else:
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return (self.total_samples + self.batch_size - 1) // self.batch_size
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class DataLoaderShard(DataLoader):
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def __init__(self, dataset, device=None, **dataloader_params):
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self.device = device
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super().__init__(dataset, **dataloader_params)
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def set_epoch(self, epoch: int):
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if self.batch_sampler is not None:
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if hasattr(self.batch_sampler, 'set_epoch'):
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self.batch_sampler.set_epoch(epoch)
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if hasattr(self.batch_sampler, 'batch_sampler') and hasattr(self.batch_sampler.batch_sampler, 'set_epoch'):
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self.batch_sampler.batch_sampler.set_epoch(epoch)
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elif self.sampler is not None and hasattr(self.sampler, 'set_epoch'):
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self.sampler.set_epoch(epoch)
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def __iter__(self):
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for item in super().__iter__():
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if self.device:
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item = to_device(item, self.device)
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yield item
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