code: public static int cusolverDnSorgqr_bufferSize(
          cusolverDnHandle handle, 
          int m, 
          int n, 
          int k, 
          Pointer A, 
          int lda, 
          Pointer tau, 
          int[] lwork)
      {
          return checkResult(cusolverDnSorgqr_bufferSizeNative(handle, m, n, k, A, lda, tau, lwork));
      }
docs: generate unitary matrix Q from QR factorization