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Table 2

General description of the applied GEP models

Number of chromosomes 30 one point recombination rate 0.3 
Head size two point recombination rate 0.3 
Number of genes gene recombination rate 0.1 
Linking function addition gene transposition rate 0.1 
Fitness function error type RRSE insertion sequence transposition rate 0.1 
Mutation rate 0.044 root insertion sequence transposition 0.1 
Inversion rate 0.1 penalizing tool parsimony pressure 
Chromosomes the chromosomes of GEP are usually composed of more than one gene of equal length. Each gene codes for a sub-expression tree and the sub-expression trees interact with one another forming a more complex multi-subunit expression tree. 
Head size determines the complexity of each term in the model 
Mutation provides the evolution of good solutions for the studied models to virtually all problems 
Inversion inversion is restricted to the heads of genes 
One point recombination the parent chromosomes are paired and split up at exactly the same point 
Two point recombination two parent chromosomes are paired and two points are randomly chosen as crossover points 
Gene recombination entire genes are exchanged between two parent chromosomes, forming two daughter chromosomes containing genes from both parents 
Gene transposition an entire gene works as a transposon and transposes itself to the beginning of the chromosome 
IS transposition short fragments of the genome with a function or terminal in the first position that transpose to the heads of gene except the root 
RIS transposition short fragments with a function in the first position that transpose to the start position of genes 
Number of chromosomes 30 one point recombination rate 0.3 
Head size two point recombination rate 0.3 
Number of genes gene recombination rate 0.1 
Linking function addition gene transposition rate 0.1 
Fitness function error type RRSE insertion sequence transposition rate 0.1 
Mutation rate 0.044 root insertion sequence transposition 0.1 
Inversion rate 0.1 penalizing tool parsimony pressure 
Chromosomes the chromosomes of GEP are usually composed of more than one gene of equal length. Each gene codes for a sub-expression tree and the sub-expression trees interact with one another forming a more complex multi-subunit expression tree. 
Head size determines the complexity of each term in the model 
Mutation provides the evolution of good solutions for the studied models to virtually all problems 
Inversion inversion is restricted to the heads of genes 
One point recombination the parent chromosomes are paired and split up at exactly the same point 
Two point recombination two parent chromosomes are paired and two points are randomly chosen as crossover points 
Gene recombination entire genes are exchanged between two parent chromosomes, forming two daughter chromosomes containing genes from both parents 
Gene transposition an entire gene works as a transposon and transposes itself to the beginning of the chromosome 
IS transposition short fragments of the genome with a function or terminal in the first position that transpose to the heads of gene except the root 
RIS transposition short fragments with a function in the first position that transpose to the start position of genes 
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