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42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
# Copyright 2024-2025 The Alibaba Wan Team Authors. All rights reserved.
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import gc
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from functools import partial
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import torch
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from torch.distributed.fsdp import FullyShardedDataParallel as FSDP
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from torch.distributed.fsdp import MixedPrecision, ShardingStrategy
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from torch.distributed.fsdp.wrap import lambda_auto_wrap_policy
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from torch.distributed.utils import _free_storage
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def shard_model(
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model,
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device_id,
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param_dtype=torch.bfloat16,
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reduce_dtype=torch.float32,
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buffer_dtype=torch.float32,
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process_group=None,
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sharding_strategy=ShardingStrategy.FULL_SHARD,
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sync_module_states=True,
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):
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model = FSDP(
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module=model,
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process_group=process_group,
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sharding_strategy=sharding_strategy,
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auto_wrap_policy=partial(
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lambda_auto_wrap_policy, lambda_fn=lambda m: m in model.blocks),
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mixed_precision=MixedPrecision(
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param_dtype=param_dtype,
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reduce_dtype=reduce_dtype,
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buffer_dtype=buffer_dtype),
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device_id=device_id,
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sync_module_states=sync_module_states)
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return model
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def free_model(model):
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for m in model.modules():
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if isinstance(m, FSDP):
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_free_storage(m._handle.flat_param.data)
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del model
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gc.collect()
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torch.cuda.empty_cache()
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