text:   inline static void backward_down_column_cdist(const scalar_t * t1, const scalar_t * t2, scalar_t * res, const scalar_t * grad_k, const scalar_t * dist_k, const Vec& pvec, int64_t r1, int64_t r2, int64_t m, int64_t d, int64_t gs, int64_t l1_size, int64_t l2_size, int64_t count = Vec::size()) {
  