message: resolve NumThreads issue when parquet datareader construct
diff: @@ -1294,7 +1294,7 @@ static void create_pipeline_internal(std::unique_ptr<DataReader<TypeKey>>& data_
  #ifdef VAL
  const int NUM_THREADS=1;
  #else
  - const int NUM_THREADS=12;
  + const int NUM_THREADS = format == DataReaderType_t::Parquet ? gpu_resource_group->get_total_gpu_count() : 12;
  #endif
  data_reader.reset(new DataReader<TypeKey>(batch_size, label_dim, dense_dim,
  