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fix: add DefaultLoadPlanner to FSDP2 + SHARDED_STATE_DICT optimizer checkpoint loading #3972

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fix: add DefaultLoadPlanner to FSDP2 + SHARDED_STATE_DICT optimizer checkpoint loading #3972

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2 changes: 2 additions & 0 deletions src/accelerate/utils/fsdp_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -281,6 +281,7 @@ def save_fsdp_optimizer(fsdp_plugin, accelerator, optimizer, model, output_dir,
def load_fsdp_optimizer(fsdp_plugin, accelerator, optimizer, model, input_dir, optimizer_index=0, adapter_only=False):
# Note: We import here to reduce import time from general modules, and isolate outside dependencies
import torch.distributed.checkpoint as dist_cp
from torch.distributed.checkpoint.default_planner import DefaultLoadPlanner
from torch.distributed.fsdp.fully_sharded_data_parallel import FullyShardedDataParallel as FSDP
from torch.distributed.fsdp.fully_sharded_data_parallel import StateDictType

Expand Down Expand Up @@ -322,6 +323,7 @@ def load_fsdp_optimizer(fsdp_plugin, accelerator, optimizer, model, input_dir, o
optim_state,
checkpoint_id=ckpt_dir,
storage_reader=dist_cp.FileSystemReader(ckpt_dir),
planner=DefaultLoadPlanner(),
)
optim_state = optim_state["optimizer"]
logger.info(f"Optimizer loaded from {ckpt_dir}")
Expand Down