#823 closed enhancement (done)
Implement tree evaluator with linear scaling to improve convergence in symbolic regression.
Reported by: | gkronber | Owned by: | gkronber |
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Priority: | lowest | Milestone: | HeuristicLab 3.3.0 |
Component: | ZZZ OBSOLETE: GP.StructureIdentification | Version: | 3.2 |
Keywords: | Cc: |
Description
As described in "Improving Symbolic Regression with Interval Arithmetic and Linear Scaling", Keijzer, Proceedings of EuroGP'2003, LNCS 2610, pp 70-82, Springer Verlag, 2003.
Change History (12)
comment:1 Changed 15 years ago by gkronber
- Status changed from new to assigned
comment:2 Changed 15 years ago by gkronber
comment:3 Changed 15 years ago by gkronber
The linear scaling operator generates different estimations for the same sample when a different range of rows is evaluated. This causes major headaches concerning model-analysis and validation.
Linear scaling should only be used in the learning process on the training and validation sets. The final model should contain the scaling factor and offset in the model structure so that it can be evaluated with a default tree evaluator (HL3TreeEvaluator).
comment:4 Changed 15 years ago by gkronber
Added target variable property for the scaling tree evaluator with r2634.
comment:5 Changed 15 years ago by gkronber
Removed the restriction of the estimated value to the range [LowerBound..UpperBound] because the estimation is scaled anyway. However the scaled values are restricted to that range with r2640.
comment:6 Changed 15 years ago by gkronber
A linear scaling predictor builder is also needed to generate a correctly scaled final solution.
comment:7 Changed 15 years ago by gkronber
Added a special predictor builder for linear scaling tree evaluation and changed default GP engines to use linear scaling evaluators with r2722.
comment:8 Changed 14 years ago by gkronber
Moved linear scaling functionality out of tree evaluator into a separate operator with r2977.
comment:9 Changed 14 years ago by gkronber
Fixed bug in regression engines with r2979.
comment:10 Changed 14 years ago by gkronber
- Resolution set to fixed
- Status changed from assigned to closed
comment:11 Changed 14 years ago by swagner
- Milestone changed from Iteration 4 to Current
Milestone Iteration 4 deleted
comment:11 Changed 14 years ago by swagner
- Milestone changed from Current to HeuristicLab 3.3.0
Milestone Current deleted
Added operators with r2579.