Bug found in DataGenerator.py

[Zeltserj]

Hi, In all the generator classes, the length function seems to be implemented wrong. The implementation:

    def __len__(self):
        'Denotes the number of batches per epoch'
        return int(np.floor(self.images.shape[1]/self.batch_size))

when actually the nominator should be self.image.shape[0], which is number of sample and not the height of the input image.