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[zero] restore fp16 params if no zero ckpts available #1322

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Merged
jeffra merged 2 commits into from
Aug 25, 2021
Merged

[zero] restore fp16 params if no zero ckpts available #1322

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restore fp16 params if no zero ckpts available
jeffra Aug 20, 2021
ce931f9
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jeffra Aug 24, 2021
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12 changes: 8 additions & 4 deletions deepspeed/runtime/engine.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1884,9 +1884,12 @@ def load_checkpoint(self,
load_module_only=load_module_only)

if self.zero_optimization() and load_path is not None:
self._load_zero_checkpoint(load_dir,
tag,
load_optimizer_states=load_optimizer_states)
success = self._load_zero_checkpoint(
load_dir,
tag,
load_optimizer_states=load_optimizer_states)
if not success:
self.optimizer._restore_from_fp16_weights()

return load_path, client_states

Expand Down Expand Up @@ -1998,7 +2001,7 @@ def _load_checkpoint(self,
def _load_zero_checkpoint(self, load_dir, tag, load_optimizer_states=True):
zero_sd_list = self._get_all_zero_checkpoints(load_dir, tag)
if zero_sd_list is None:
return
return False

self.optimizer.load_state_dict(
state_dict_list=zero_sd_list,
Expand All @@ -2007,6 +2010,7 @@ def _load_zero_checkpoint(self, load_dir, tag, load_optimizer_states=True):
print(
f'loading {len(zero_sd_list)} zero partition checkpoints for rank {self.global_rank}'
)
return True

def _get_mp_rank_zero_checkpoint_names(self, load_dir, tag, mp_rank, dp_world_size):
zero_ckpt_names = []
Expand Down