I have got this erros when trying to test your model. I have followed the path to create the manifest.csv

[navarmn]

Traceback (most recent call last):
File "test.py", line 49, in
dataset = AudioDataset(args.data_dir, args.manifest, transforms=transforms, target_transforms=target_transforms)
File "/workspace/codes/data.py", line 30, in init
if zipfile.is_zipfile(self.data_dir):
File "/opt/conda/lib/python3.7/zipfile.py", line 180, in is_zipfile
with open(filename, "rb") as fp:
TypeError: expected str, bytes or os.PathLike object, not NoneType

[igormq]

It seems that you are not setting correctly the flag --data-dir. :)