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add torch.no_grad() for block swap #161

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add torch.no_grad() for block swap #161

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7d66d4d
add torch.no_grad() in block-swap
kohya-ss Mar 16, 2025
74c99ba
Merge branch 'main' into no-grad-on-block-swap
kohya-ss Mar 18, 2025
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27 changes: 14 additions & 13 deletions modules/custom_offloading_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,19 +56,20 @@ def swap_weight_devices_cuda(device: torch.device, layer_to_cpu: nn.Module, laye

torch.cuda.current_stream().synchronize() # this prevents the illegal loss value

stream = torch.cuda.Stream()
with torch.cuda.stream(stream):
# cuda to cpu
for module_to_cpu, module_to_cuda, cuda_data_view, cpu_data_view in weight_swap_jobs:
cuda_data_view.record_stream(stream)
module_to_cpu.weight.data = cuda_data_view.data.to("cpu", non_blocking=True)

stream.synchronize()

# cpu to cuda
for module_to_cpu, module_to_cuda, cuda_data_view, cpu_data_view in weight_swap_jobs:
cuda_data_view.copy_(module_to_cuda.weight.data, non_blocking=True)
module_to_cuda.weight.data = cuda_data_view
with torch.no_grad():
stream = torch.cuda.Stream()
with torch.cuda.stream(stream):
# cuda to cpu
for module_to_cpu, module_to_cuda, cuda_data_view, cpu_data_view in weight_swap_jobs:
cuda_data_view.record_stream(stream)
module_to_cpu.weight.data = cuda_data_view.data.to("cpu", non_blocking=True)

stream.synchronize()

# cpu to cuda
for module_to_cpu, module_to_cuda, cuda_data_view, cpu_data_view in weight_swap_jobs:
cuda_data_view.copy_(module_to_cuda.weight.data, non_blocking=True)
module_to_cuda.weight.data = cuda_data_view

stream.synchronize()
torch.cuda.current_stream().synchronize() # this prevents the illegal loss value
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