A New Dual-Mode GEP Prediction Algorithm Based on Irregularity and Similar Period

Table 1

GEP and DM_GEP comparison test parameter settings.

Parameter setting	GEP/IPM (leek price)	GEP/IPM (sunspot)	SPM (sunspot)
Head length	7
Population capacity	50	100
Select range	1000
Number of genes	3
Connection function	{+}
Symbol set	{+, −, , /}
Terminal symbols	{a, b, c, d, e}	{a, b, c, d, e, f, g, h, i, j}
Mutation rate	0.044
Single-point mutation rate	0.3
Double-point mutation rate	0.3
Gene recombination rate	0.1
Insertion transposition rate	0.1
Root insert transposition rate	0.1
(ROOT) Length of that insert seat	{1, 2, 3}
Best fitness value	97900/97800	79100/79000	7900
Number of experiments	1000	50