Abstract
pi Grammatical Evolution is presented and its
performance on four benchmark problems is reported. pi
Grammatical Evolution is a position-independent
variation on Grammatical Evolution's genotype-phenotype
mapping process where the order of the derivation
sequence steps are no longer applied to non-terminals
in a predefined fashion from left to right on the
developing program. Instead the genome is used to
specify which nonterminal will be developed next, in
addition to specifying the rule that will be applied to
that nonterminal. Results suggest that the adoption of
a more flexible mapping process where the order of
nonterminal expansion is not determined a-priori, but
instead itself evolved, is beneficial for Grammatical
Evolution.
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