Convolutional Neural Networks for visual image recognition have neurons arranged in 3 dimensions: width, height, depth.Deep Learning

https://software.intel.com/en-us/ai/machine-learning?cid=sem43700012846325898&intel_term=convolutional+neural+networks&gclid=CjwKEAjw85DIBRCy2aT0hPmS1jkSJAC1m9UvCgrXjDdlL8xV1ZTEfDP0DqFVRwsuowP2hVdQRxMDGBoCc_nw_wcB&gclsrc=aw.ds

Deep Learning
http://deeplearning.net/tutorial/lenet.html