Sign              455 modules/ml/src/gbt.cpp                 grad_data[idx] = Sign(resp_data[idx] - current_data[idx]);
Sign              480 modules/ml/src/gbt.cpp                 grad_data[idx] = (fabs(r) > delta) ? delta*Sign(r) : r;
Sign              717 modules/ml/src/gbt.cpp                 gamma += (delta < fabs(dif)) ? Sign(dif)*delta : dif;