**Symbol Meaning Reference** *D* downsampling factor Section 3.1.1 *sin* channel input size Section 3.1.1 *sout* downsampled input channel size Section 3.1.1 Operation*<sup>f</sup>* number of floating points operations Section 3.1.1 Param*<sup>g</sup>* number of parameters associated with each IGDN/GDN Section 3.1.1 Operation*<sup>g</sup>* number of floating points operations of each GDN/IGDN Section 3.1.1 *ζ* random variable that follows a Laplacian distribution Section 3.2.1 *μ* mean value of a Laplacian distribution Section 3.2.1 *b* scale parameter of a Laplacian distribution Section 3.2.1 *Var*(*ζ*) variance of a laplacian distributed random variable Section 3.2.1 *yi* feature map elements Section 3.2.2 *Ij* set of indexes covering the *j*th feature Section 3.2.2

#### **Table A1.** *Cont.*

### **References**

