= Genetic Programming with HeuristicLab =

[[http://dev.heuristiclab.com/trac/hl/core/wiki/UsersSamples#GeneticProgramming | Samples for Genetic Programming]]

HeuristicLab supports tree-based (Koza-style) genetic programming. This classical form of genetic programming uses a tree-based representation of solution candidates. The data types and operators to work with tree-bsaed solution candidates are implemented in the plugin `HeuristicLab.Encodings.SymbolicExpressionTree`. 

Supported operators (in 3.3.6):
 * Full tree creator
 * Grow tree creator
 * Ramped-half-half tree creator
 * Probabilistic tree creator (PTC)
 * Subtree crossover
 * Change node type manipulator (single point mutation, symbols)
 * Replace branch manipulator (removes a branch and replaces it with a randomly initialized branch)  
 * One-point shaker (single point mutation, only parameters)
 * Full-tree shaker (uniform mutation, only parameters)

The symbolic expression tree encoding contains the implementation of the problem independent data structure (a tree of symbols) and operators. Based on the encoding we implemented three well-known GP problems.

Supported Problems (in 3.3.6):
 * Symbolic regression (`HeuristicLab.Problems.DataAnalysis.Symbolic.Regression`)
 * Symbolic classification (`HeuristicLab.Problems.DataAnalysis.Symbolic.Classification`)
 * Artificial Ant problem (`HeuristicLab.Problems.ArtificialAnt`)

Samples for all three of these problems are available on the `Start page` in HeuristicLab. Additional samples are available here: [[http://dev.heuristiclab.com/trac/hl/core/wiki/UsersSamples#GeneticProgramming]]