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Auto wrap modules in ZeRO 3 based on _no_split_modules as FSDP #3323

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Auto wrap modules in ZeRO 3 based on _no_split_modules as FSDP #3323

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17 changes: 17 additions & 0 deletions src/accelerate/accelerator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1848,8 +1848,25 @@ def _prepare_deepspeed(self, *args):

engine, optimizer, _, lr_scheduler = ds_initialize(**kwargs)
if compare_versions("deepspeed", ">=", "0.14.4") and self.state.dynamo_plugin.backend != DynamoBackend.NO:
from deepspeed.utils import z3_leaf_module, set_z3_leaf_modules

if transformers_no_split_modules := getattr(model, "_no_split_modules", None):
leaf_cls = []
for module in model.modules():
if module.__class__ in leaf_cls:
continue
elif z3_leaf_module(module):
# have user-specificed z3 leaf module
leaf_cls.clear()
break
elif module.__class__.__name__ in transformers_no_split_modules:
leaf_cls.append(module.__class__)
if leaf_cls:
set_z3_leaf_modules(model, leaf_cls)

compile_kwargs = self.state.dynamo_plugin.to_kwargs()
engine.compile(backend=compile_kwargs.pop("backend"), compile_kwargs=compile_kwargs)

if optimizer is not None:
optimizer = DeepSpeedOptimizerWrapper(optimizer)
if scheduler is not None:
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