Do scientists or research experts know from the kitchen what is happening inside complex "deep" neural network with at least millions of connections firing at an instant? Do they understand the process behind this (e.g. what is happening inside and how it works exactly), or it is a subject of debate?
For example this study says:
However there is no clear understanding of why they perform so well, or how they might be improved.
So does this mean that scientists actually don't know how complex convolutional network models work?
