typedef struct {
   double* cc_space_v_oo_chol;
   double* cc_space_v_ov_chol;
   double* cc_space_v_vo_chol;
   double* cc_space_v_vv_chol;
   double* cc_space_v_oooo;
   double* cc_space_v_vooo;
   double* cc_space_v_oovv;
   double* cc_space_v_vvoo;
   double* cc_space_v_oovo;
   double* cc_space_v_ovvo;
   double* cc_space_v_ovov;
   double* cc_space_v_ovoo;
   double* cc_space_f_vo;
} gpu_data;