Here you can change the number of samples used for training and the number of samples used for testing the generalizing capabilities of the evolved models.

Here is also the place where you choose the size of the population of evolving models (Number of Chromosomes) and where you design the structural organization of the chromosomes by choosing the Head Size, the Number of Genes, and the Linking Function. For mathematical problems, you can choose from four different linking functions (addition, subtraction, multiplication, and division); and for Boolean problems, you can choose from 10 different linking functions (And, Or, Nand, Nor, Xor, Nxor, Less Than, Greater Than, Less Or Equal, Greater Or Equal).

The Head Size and the Number of Genes are constrained by the maximum chromosome size allowed in GeneXproTools, which is 2049. And the chromosome size depends not only on the Number of Genes and Head Size but also on maximum arity and the learning algorithm (with or without random numerical constants).

And, finally, in the General Settings Tab you can also enter the parameters for the Complexity Increase Engine. In the Generations Without Change box you set the period of time you think acceptable for evolution to occur without improvement in best fitness, after which a mass extinction or a neutral gene (an extra term) is automatically added to your model; in the Number of Tries box you enter the number of consecutive evolutionary epochs (defined by the parameter Generations Without Change) you will allow before a neutral gene is introduced in all evolving models; in the Max. Complexity box you write the maximum number of terms (genes) you’ll allow in your model and no other terms will be introduced beyond this threshold.

The Complexity Increase Engine of GeneXproTools 4.0 might be a very powerful modeling tool, especially for Time Series Prediction where good models could take longer to come by, but you must be careful not to create excessively complex models for, most of the times, a greater complexity does not necessarily imply a greater efficiency.

The General Settings Tab used for Time Series Prediction gives access to all the parameters listed above, but has also additional parameters necessary for dealing with time series data (the Embedding Dimension, the Delay Time, the Prediction Mode and the number of Testing Predictions).

In practice, the embedding dimension corresponds to the number of independent variables (terminals) after your time series has been transformed. The delay time t determines how data are processed, that is, continuously if t = 1 or at t intervals.

These two parameters, together with the size of the time series and the prediction mode, will determine the final number of training samples after the transformation of the time series.