model.matrix is used.
Non factor features will be left untouched and passed to the result.createDummyFeatures(obj, target = character(0L), method = "1-of-n",
exclude = character(0L))data.frame | Task]. Same type as obj.capLargeValues;
dropFeatures;
mergeSmallFactorLevels;
normalizeFeatures;
removeConstantFeatures;
summarizeColumns