message: Update datasci_tester.cc
  minor comment fix
diff: @@ -517,7 +517,7 @@ int main(int argc, char *argv[]) {
  std::string>(std::cout);
  {
  - std::cout << "\n\nTesing transpose() modify_by_idx()" << std::endl;
  + std::cout << "\n\nTesing transpose()" << std::endl;
  std::vector<unsigned long> idx =
  { 123450, 123451, 123452, 123450, 123455, 123450, 123449 };
  