671 struct CvDTreeNode  struct
677     CvDTreeNode* parent;  argument
678     CvDTreeNode* left;  argument
679     CvDTreeNode* right;  argument
681     CvDTreeSplit* split;
683     int sample_count;
684     int depth;
685     int* num_valid;
686     int offset;
687     int buf_idx;
688     double maxlr;
691     int complexity;
692     double alpha;
693     double node_risk, tree_risk, tree_error;
696     int* cv_Tn;
697     double* cv_node_risk;
698     double* cv_node_error;
700     int get_num_valid(int vi) { return num_valid ? num_valid[vi] : sample_count; }  in get_num_valid()
701     void set_num_valid(int vi, int n) { if( num_valid ) num_valid[vi] = n; }  in set_num_valid()