import numpy as np
np.random.seed(42)
path_data = Path(base_dir+'faces/images/images')
data = ImageDataLoaders.from_folder(path_data, train="train", valid="validation",
ds_tfms=aug_transforms(), size=224, num_workers=4).normalize(imagenet_stats)
TypeError: 'NoneType' object is not iterable
Please tell me how to change my code to solve the problem, thanks a lot.