std::cerr<<__FILE__<<":"<<__LINE__<<" error all the elements in the y vector must have the same numbers, element "<<i<<": "<<y.get(i).size()<<" "<<" mismatch the numbers of elements at 0: "<<sz<<"/n";
std::cerr<<__FILE__<<":"<<__LINE__<<" error all the elements in the y vector must have the same numbers of elements "<<y.get(i).size()<<" != "<<sz<<"\n";