def img_to_vgg(x):
    '''Condition an image for use with the VGG16 model.'''
    x = x[:,:,::-1]  # to BGR
    x[:, :, 0] -= 103.939
    x[:, :, 1] -= 116.779
    x[:, :, 2] -= 123.68
    x = x.transpose((2, 0, 1))
    return x
Condition an image for use with the VGG16 model.