Nonlinear All-Optical Diffractive Deep Neural Network with 10.6 μm Wavelength for Image Classification

Table 2

The inference time of the N-D²NN model using three ReLU activation functions for the MNIST dataset and fashion-MNIST dataset.

	Inference time (s)
	MNIST	Fashion-MNIST
Leaky-ReLU	0.12	0.14
PReLU	0.13	0.16
RReLU	0.11	0.13