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Table 2

Setting parameters of the used GEP strategy for modeling damaged permeability in this study.

GEP algorithm parameters Value
No. of chromosomes 30
No. of genes 3
Head size 7
Linking function +
Generations without change 2000
Fitness function Root Mean Square Error
Inversion 0.00546
Mutation 0.00138
IS transposition 0.00546
RIS transposition 0.00546
One-point recombination 0.00277
Two-point recombination 0.00277
Gene transposition 0.00277
Gene recombination 0.00277
Permutation 0.00546
Constants per gene 10
Random chromosomes 0.0026
Type of data Floating point
Random cloning 0.00102
Operators used +, −, ×, /, √, EXP, INV, LN, LOG, X2, POW

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