Preparing dataset without `--interpolate` fails

[maximyudayev]

Summary

Running this fails:

python prepare_dataset.py --sampling_rate 16000 --scale 4 --window_size 8192 --window_stride 4096 --batch_size 128 --low_pass --out_dir 'datasets'

I assume the error comes from here.

Audio_SR/data/vctk/prep_vctk.py

Line 27 in d4d7353

def add_data(h5_file, inputfiles, args, save_examples=False):

Expected behavior:

1. Creates a folder whose name matches the arguments passed to the prepare_dataset.py.
2. Produces h5 file with N patches of <window_size>, <window_stride> samples apart, interpreting WAV files as <sampling_rate> Hz audio, for each audio recording without interpolation.
3. Expect low resolution patches to be smaller in window size than <window_size>, or to have less patches than in the full resolution h5 files.