How to tile a tensor?

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For anyone new looking for this issue, an updated function has also been introduced in pytorch - torch.repeat_interleave() to address this issue in a single operation.

So one can use torch.repeat_interleave(z, repeats=3, dim=0) to obtain:

tensor([[1., 2., 3.],
        [1., 2., 3.],
        [1., 2., 3.],
        [4., 5., 6.],
        [4., 5., 6.],
        [4., 5., 6.]])

and similarly can use torch.repeat_interleave(z, repeats=3, dim=1) to obtain:

tensor([[1., 1., 1., 2., 2., 2., 3., 3., 3.],
        [4., 4., 4., 5., 5., 5., 6., 6., 6.]])
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