Neural Network Architecture (units and layers)

in week Andrew said we will learn how to choose how many layers and unit we want in a neural network model, i finished week 2 and still didn’t get the answer of that question, please point me to the video where he talks about it, thanks.

He might have given some guidance about this, but there is no definitive way of finding the exact number of layers and neurons per layer in a neural network. Rather a trial and error search which can also can be automated needs be perfomed.