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Is it

  1. number of units in a layer
  2. number of layers
  3. overall complexity of the network (both 1 and 2)
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  • $\begingroup$ Usually it refers to the number of layers that are sequential (i.e. one after the other). However, it isn't used much like a quantity (e.g. this network has a depth of 8), rather a qualitative characteristic of the network (e.g. this network is deeper than the other). $\endgroup$
    – Djib2011
    Feb 18 '20 at 9:33
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Very good question, I have heard it refered to all the 3 ways you described. I am not sure if there is a purely objective answer so I will answer with what I understand by "depth" generally:

  • If speaking of model architecture: the number of layers of the model.
  • If speaking of CNN layers: the number of filters (not to be confused with the size of the kernel).
  • If speaking of RNN layers: the number of time steps (temporal "depth").

On the other hand I have never heard about depth regarding to FC layers. As I said the term "depth" is very subjective depending on the speakers. It should not be this way, and maybe theoretically is not, but I speak from what I heard in my experience.

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