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Support latest PyTorch RNG state API. #8

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Merged
shoeybi merged 1 commit into from
Sep 12, 2019
Merged

Support latest PyTorch RNG state API. #8

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23 changes: 20 additions & 3 deletions mpu/random.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,9 +41,26 @@ def _set_cuda_rng_state(new_state, device=-1):
with a single change: the input state is not cloned. Cloning caused
major performance issues for +4 GPU cases.
"""
def cb():
with device_ctx_manager(device):
_C._cuda_setRNGState(new_state)
if hasattr(_C, '_cuda_setRNGState') and callable(_C._cuda_setRNGState):
# older PyTorch
def cb():
with device_ctx_manager(device):
_C._cuda_setRNGState(new_state)
else:
# newer PyTorch
if device == -1:
device = torch.device('cuda')
elif isinstance(device, str):
device = torch.device(device)
elif isinstance(device, int):
device = torch.device('cuda', device)

def cb():
idx = device.index
if idx is None:
idx = torch.cuda.current_device()
default_generator = torch.cuda.default_generators[idx]
default_generator.set_state(new_state)

_lazy_call(cb)

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