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Adding torch accelerator to FSDP2 example #1367

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Adding torch accelerator to FSDP2 example #1367

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15 changes: 12 additions & 3 deletions distributed/FSDP2/train.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,9 +30,18 @@ def set_modules_to_backward_prefetch(model, num_to_backward_prefetch):

def main(args):
rank = int(os.environ["LOCAL_RANK"])
device = torch.device(f"cuda:{rank}")
torch.cuda.set_device(device)
torch.distributed.init_process_group(backend="nccl", device_id=device)
if torch.accelerator.is_available():
device_type = torch.accelerator.current_accelerator()
device: torch.device = torch.device(f"{device_type}:{rank}")
torch.accelerator.device_index(rank)
print(f"Running on rank {rank} on device {device}")
backend = torch.distributed.get_default_backend_for_device(device)
torch.distributed.init_process_group(backend=backend, device_id=device)
else:
device = torch.device("cpu")
print(f"Running on device {device}")
torch.distributed.init_process_group(backend="gloo", device_id=device)

torch.manual_seed(0)
vocab_size = 1024
batch_size = 32
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