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[zero_to_fp32] 3x less cpu memory requirements #4025

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Merged
tjruwase merged 4 commits into from
Jul 25, 2023
+5 −1
Merged

[zero_to_fp32] 3x less cpu memory requirements #4025

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[zero_to_fp32] 3x less cpu memory requirements
stas00 Jul 24, 2023
b8e2a38
safer version
stas00 Jul 24, 2023
0b515ca
style
stas00 Jul 24, 2023
0df6094
Merge branch 'master' into patch-4
stas00 Jul 25, 2023
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6 changes: 5 additions & 1 deletion deepspeed/utils/zero_to_fp32.py
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Expand Up @@ -143,7 +143,11 @@ def parse_optim_states(files, ds_checkpoint_dir):
total_files = len(files)
state_dicts = []
for f in files:
state_dicts.append(torch.load(f, map_location=device))
state_dict = torch.load(f, map_location=device)
# immediately discard the potentially huge 2 optimizer states as we only care for fp32 master weights
# and also handle the case where it was already removed by another helper script
state_dict["optimizer_state_dict"].pop("optimizer_state_dict", None)
state_dicts.append(state_dict)

if not ZERO_STAGE in state_dicts[0][OPTIMIZER_STATE_DICT]:
raise ValueError(f"{files[0]} is not a zero checkpoint")
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