Method DeviceSpMatCOO

XM/include/Utils/memory.h:681–681

        cusparseSpMatDescr_t cusparse_descr = nullptr;

        DeviceSpMatCOO(){}
        DeviceSpMatCOO(const size_s gpu_id, const size_s row_size, const size_s col_size, const size_l nnz):
            gpu_id(gpu_id), row_size(row_size), col_size(col_size), nnz(nnz),
            col_ids(nullptr), row_ids(nullptr), vals(nullptr), cusparse_descr(NULL) {