t-BMPNet: Trainable Bitwise Multilayer Perceptron Neural Network over Fully Homomorphic Encryption Scheme

Table 2

Execution time (minute) of key operations—multiplication, division, exponential, and sigmoid function—and training algorithms measured in minute unit.

Trainable bitwise multilayer perceptron neural network (t-BMPNet)
Time	Key operation				Training algorithm
(Min)	Multiplication	Division	Exponential	Sigmoid	Feedforward	Backpropagation	Total
8-bit	0.08	0.11	0.23	0.36	0.89	0.57	1.46
16-bit	0.37	0.45	0.93	1.41	3.6	2.63	6.23
32-bit	1.65	1.8	3.78	5.6	14.59	11.64	26.23