Input Numpy or symbolic tensor, 3D or 4D.

Data format of the image tensor/array.

One of "caffe", "tf", or "torch"

• caffe: will convert the images from RGB to BGR, then will zero-center each color channel with respect to the ImageNet dataset, without scaling.

• tf: will scale pixels between -1 and 1, sample-wise.

• torch: will scale pixels between 0 and 1 and then will normalize each channel with respect to the ImageNet dataset.