torch Tensor initialization

torch.empty() fastest

shape = (2, 3, 4)
x = torch.empty(shape)
x = torch.empty(2, 3, 4)

torch.zeros()

shape = (2, 3, 4)
x = torch.zeros(shape)
x = torch.zeros(2, 3, 4)

torch.ones()

shape = (2, 3, 4)
x = torch.ones(shape)
x = torch.ones(2, 3, 4)

Copy

b = torch.empty_like(a)   # same shape/dtype
c = torch.zeros_like(a)   # same shape with 0