preprocess3.py

seq = iaa.Sequential([
    iaa.Fliplr(0.5),
    iaa.Crop(percent=(0,0.1)),
    iaa.LinearContrast((0.75,1.5)),
    iaa.Multiply((0.8,1.2), per_channel=0.2),
    iaa.Affine(
        scale={'x':(0.8,1.2), "y":(0.8,1.2)},
        translate_percent={"x":(-0.2,0.2),"y":(-0.2,0.2)},
        rotate=(-25,25),
        shear=(-8,8)
    )
], random_order=True)

(aug_images, aug_labels) = augment_add(images, seq, labels)
images = np.concatenate([images, aug_images])
labels = np.concatenate([labels, aug_labels])

images.shape, labels.shape

labels = to_categorical(labels)