findSplitCatReg   319 modules/ml/src/precomp.hpp         virtual WSplit findSplitCatReg( int vi, const vector<int>& _sidx, double initQuality, int* subset );
findSplitCatReg   432 modules/ml/src/tree.cpp                 split = findSplitCatReg(vi, _sidx, 0, subset);