Application of Gene Expression Programming to Evaluate Strength Characteristics of Hydrated-Lime-Activated Rice Husk Ash-Treated Expansive Soil

Table 4

Parameters setting for GEP algorithms.

Parameters	Settings
	CBR, UCS28, RValue
General
Training records	81
Validation/Testing records	40
Number of chromosomes	50
Number of genes	3
Head size	8
Linking function	Addition
Function set	+, −, ×, ÷, exp, Sqrt, ln
Numerical constants
Constants per gene	10
Type of data	Floating point
Maximum complexity	10
Ephemeral random constant	[−10, 10]
Genetic operators
Mutation	0.00138
Inversion rate	0.00546
IS transposition rate	0.00546
RIS transposition rate	0.00546
One-point recombination rate	0.00277
Two-point recombination rate	0.00277
Gene recombination rate	0.00277
Uniform recombination	0.00755