unsqueeze in PyTorch

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*My post explains squeeze().

unsqueeze() can get the 1D or more D tensor of zero or more elements with additional dimension whose size is 1 from the 0D or more D tensor of zero or more elements as shown below:

*Memos:

• unsqueeze() can be used with torch or a tensor.
• The 1st argument(input) with torch or using a tensor(Required-Type:tensor of int, float, complex or bool).
• The 2nd argument with torch or the 1st argument with a tensor is dim(Required-Type:int). *It can add the dimension whose size is 1 to a specific position.

import torch

my_tensor = torch.tensor([[0, 1, 2],
                          [3, 4, 5],
                          [6, 7, 8],
                          [10, 11, 12]])
torch.unsqueeze(input=my_tensor, dim=0)
my_tensor.unsqueeze(dim=0)
torch.unsqueeze(input=my_tensor, dim=-3)
# tensor([[[0, 1, 2],
#          [3, 4, 5],
#          [6, 7, 8]
#          [10, 11, 12]]])

torch.unsqueeze(input=my_tensor, dim=1)
torch.unsqueeze(input=my_tensor, dim=-2)
# tensor([[[0, 1, 2]],
#         [[3, 4, 5]],
#         [[6, 7, 8]]
#         [[10, 11, 12]]])

torch.unsqueeze(input=my_tensor, dim=2)
torch.unsqueeze(input=my_tensor, dim=-1)
# tensor([[[0], [1], [2]],
#         [[3], [4], [5]],
#         [[6], [7], [8]],
#         [[10], [11], [12]]])

torch.unsqueeze(input=my_tensor, dim=3)
torch.unsqueeze(input=my_tensor, dim=-1)
# tensor([[[[0], [1], [2], [3]], [[4], [5], [6], [7]]],
#         [[[8], [9], [10], [11]], [[12], [13], [14], [15]]],
#         [[[16], [17], [18], [19]], [[20], [21], [22], [23]]]])

my_tensor = torch.tensor([[0., 1., 2.],
                          [3., 4., 5.],
                          [6., 7., 8.],
                          [10., 11., 12.]])
torch.unsqueeze(input=my_tensor, dim=0)
# tensor([[[0., 1., 2.],
#          [3., 4., 5.],
#          [6., 7., 8.],
#          [10., 11., 12.]]])

my_tensor = torch.tensor([[0.+0.j, 1.+0.j, 2.+0.j],
                          [3.+0.j, 4.+0.j, 5.+0.j],
                          [6.+0.j, 7.+0.j, 8.+0.j],
                          [10.+0.j, 11.+0.j, 12.+0.j]])
torch.unsqueeze(input=my_tensor, dim=0)
# tensor([[[0.+0.j, 1.+0.j, 2.+0.j],
#          [3.+0.j, 4.+0.j, 5.+0.j],
#          [6.+0.j, 7.+0.j, 8.+0.j],
#          [10.+0.j, 11.+0.j, 12.+0.j]]])

my_tensor = torch.tensor([[True, False, True],
                          [False, True, False],
                          [True, False, True],
                          [False, True, False]])
torch.unsqueeze(input=my_tensor, dim=0)
# tensor([[[True, False, True],
#          [False, True, False],
#          [True, False, True],
#          [False, True, False]]])

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