[Python] What does "unsqueeze" do in Pytorch?

The PyTorch documentation says:

Returns a new tensor with a dimension of size one inserted at the specified position. [...]

>>> x = torch.tensor([1, 2, 3, 4])
>>> torch.unsqueeze(x, 0)
tensor([[ 1, 2, 3, 4]])
>>> torch.unsqueeze(x, 1)
tensor([[ 1],
[ 2],
[ 3],
[ 4]])​

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