import torch
from torch.testing import get_all_dtypes

dtypes = get_all_dtypes()
dtypes.remove(torch.half)
dtypes.remove(torch.bool)
if torch.bfloat16 in dtypes:
    dtypes.remove(torch.bfloat16)

grad_dtypes = [torch.float, torch.double]

devices = [torch.device('cpu')]
if torch.cuda.is_available():
    devices += [torch.device('cuda:{}'.format(torch.cuda.current_device()))]


def tensor(x, dtype, device):
    return None if x is None else torch.tensor(x, dtype=dtype, device=device)