Layers

[Michael.Witbrock@F.GP.CS.CMU.EDU]

There is a completely defined way of counting layers. Note, however,
	 that I am not arguing for its adoption.
	 
Let the distance between two units be defined as the *minimal* number of 
modifiable weights forming a path between them (i.e. the number of weights on 
the shortest path between the two nodes) . 

Then the Layer in which a unit lies is the minimal distance between it and 
an input unit. 

The number of layers in the network is the maximum value of the
	 distance between any unit and an input unit.
	 
See how much damage a little graph theory can do.
michael