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See also: Dataset Editor, Create Binary Datasets 

Split Dataset

Command: Editors > Dataset Editor ..... Dataset Editor > Split Dataset

This command allows you to split the current dataset into two parts (for example, into a test set and a training set). The Split Point control determines the percentage of data points which are copied to Dataset 1, the remaining data points are copied to Dataset 2.

Please note that the split is calculated by a random selection per class, which means that the proportion of the classes in the split datasets are kept approx. constant. If one class contains too few data points the split cannot be performed (i.e. if any class would result in zero data points of that class after the split).