abstract = "Expression Grammars have the potential to integrate
Genetic Algorithms, Genetic Programming, Swarm
Intelligence, and Differential Evolution into a
seamlessly unified array of tools for use in symbolic
regression. The features of abstract expression
grammars are explored, examples of implementations are
provided, and the beneficial effects of abstract
expression grammars are tested with several published
nonlinear regression problems.",
notes = "p 860 {"}Abstract constants represent placeholders for
real numbers which are to be optimized{"}. Abstract
features inputs again optimised by PSO, DE, etc.
Abstract functions chosen by GA etc from predefined
list of functions. User uses grammar to decide how much
freedom or how constrained system is to be. 10000
training examples.
Also known as \cite{DBLP:conf/gecco/Korns09}. Part of
\cite{DBLP:conf/gec/2009}",