Table 13. The size of features and execution time before and after the fusion using AE.

Fusion	Size of features	Execution time
Forward strategy (FS-5-BH-FW) BreakHis Dataset
Before AE	23,128	9 h 4 m 10 s
After AE	6,194	5 h 3 m 18 s
Backward strategy (FS-1-BH-FW) BreakHis Dataset
Before AE	3,0229	12 h 9 m 50 s
After AE	9,562	7 h 19 m 24 s
Forward strategy (FS-6-ICIAR-FW) ICIAR-2018 Dataset
Before AE	25,229	10 h 18 m 37 s
After AE	7,924	5 h 55 m 29 s
Backward strategy (FS-4-ICIAR-BW) ICIAR-2018 Dataset
Before AE	20,642	7 h 51 m 5 s
After AE	5,348	3 h 47 m 48 s