combine_A_and_B issue

When I run the file, it outputs 

[fold_A] =  ./path/A/
[fold_B] =  /path/B/
[fold_AB] =  ./path/AB
[num_imgs] =  1000000
[use_AB] =  False
[no_multiprocessing] =  True
split = test, use 189/189 images
split = test, number of images = 189
split = train, use 756/756 images
split = train, number of images = 756

But when I check the folder, no images have been created?