message: Set max_nnz >= 1
diff: @@ -249,7 +249,7 @@ void data_generation(std::string file_list_name, std::string data_prefix, int nu
  data_writer.write();
  for (int i = 0; i < num_records_per_file; i++) {
  - UnifiedDataSimulator<int> idata_sim(0, max_nnz - 1); // both inclusive
  + UnifiedDataSimulator<int> idata_sim(1, max_nnz); // for nnz
  UnifiedDataSimulator<float> fdata_sim(0, 1);
  UnifiedDataSimulator<T> ldata_sim(0, vocabulary_size - 1);
  for (int j = 0; j < label_dim + dense_dim; j++) {
  @@ -308,7 +308,7 @@ void data_generation_for_localized_test(std::string file_list_name, std::string
  data_writer.write();
  for (int i = 0; i < num_records_per_file; i++) {
  - UnifiedDataSimulator<int> idata_sim(0, max_nnz - 1); // for nnz
  + UnifiedDataSimulator<int> idata_sim(1, max_nnz); // for nnz
  UnifiedDataSimulator<float> fdata_sim(0, 1); // for lable and dense
  UnifiedDataSimulator<T> ldata_sim(0, vocabulary_size - 1); // for key
  for (int j = 0; j < label_dim + dense_dim; j++) {
  