File size: 653 Bytes
6ed4a9c |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
# Copyright (c) OpenMMLab. All rights reserved.
from torch._subclasses.fake_tensor import _is_tensor_constructor
from torch.utils._python_dispatch import TorchDispatchMode
class MetaTensorContext(TorchDispatchMode):
def __torch_dispatch__(self, func, types, args=(), kwargs=None):
if _is_tensor_constructor(func):
device_idx = [arg.name
for arg in func._schema.arguments].index('device')
if len(args) > device_idx:
args = list(args)
args[device_idx] = 'meta'
else:
kwargs['device'] = 'meta'
return func(*args, **kwargs)
|