Fix bugs and update the code to support Pytorch 1.13.1

[ErikValle]

• datasets/mnist.py line 7 -> Add ":" after the if scale
• datasets/svhn.py lines 9 and 10 -> Replace "train_23x23.mat" and "test_23x23.mat" with "svhn_train_32x32.mat" and "svhn_test_32x32.mat", respectively.
• datasets/unaligned_data_loader.py line 101-> Replace transforms.Scale(scale) with transforms.Resize(scale)
• solver_MSDA.py lines 236, 357, and 362 -> remove every [0] after .data
• I created a new notebook in Colab for you to look at: https://colab.research.google.com/drive/1VOj-c5OwaQ5SF2dXqDWUoT1fioiZKbS6?usp=share_link