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Changes between Version 4 and Version 5 of AdditionalMaterial/ECML-PKDD


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Timestamp:
06/28/12 12:43:52 (12 years ago)
Author:
gkronber
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  • AdditionalMaterial/ECML-PKDD

    v4 v5  
    1919== Identification of Non-Linear Models ==
    2020As a preparation for symbolic regression a number of parameters have to be configured. A very important parameter is the grammar that restricts the possible shapes of evolved models and defines the basic building blocks for symbolic regression models (function set).
    21 [[Image(grammar.png)]]
     21[[Image(grammar.png, with=300)]]
    2222
    2323Other important parameters are the error function that should be minimized (e.g. mean of squared errors, mean of absolute errors, Pearson's R², ...), and the maximal size of the models. Additionally the parameters of the underlying evolutionary algorithm like population size, mutation rate, and number of iterations can be configured.
     
    2727
    2828In HeuristicLab a number of different charts and error metrics are available directly in the GUI for each produced solutions. All results are updated dynamically while the algorithm is running.
    29 [[Image(screenshots.png)]]
     29[[Image(screenshots.png, with=300)]]
    3030
    3131== Identification of Relevant Variables ==
    3232Frequently it is not necessary to learn a full model of the functional relationship but instead only find a set of relevant variables for the process. This can be achieved easily with HeuristicLab through analysis of relative variable frequencies in the population of models. The following Figure shows a variable frequency chart that clearly shows the six most relevant variables. Notably, the relevance of variables is determined based on non-linear models. So, non-linear influence factors and pair-wise interacting factors can be identified as well. 
    3333
    34 [[Image(relevantvariables_small.png)]]
     34[[Image(relevantvariables_small.png, with=300)]]
    3535
    3636== Simplification of Models with Visual Hints ==