label.shape=(n, 28, 28)
label = torch.repeat_interleave(label.unsqueeze(dim=1), repeats=5, dim=1) # (n, 8, 56, 56)
label.shape=(n, 5, 28, 28)
label.shape=(n, 28, 28)
label = torch.repeat_interleave(label.unsqueeze(dim=1), repeats=5, dim=1) # (n, 8, 56, 56)
label.shape=(n, 5, 28, 28)