code: def cublasSsbmv(handle, uplo, n, k, alpha, A, lda, x, incx, beta, y, incy):
      
  
      status = _libcublas.cublasSsbmv_v2(handle,
                                         _CUBLAS_FILL_MODE[uplo], n, k,
                                         ctypes.byref(ctypes.c_float(alpha)),
                                         int(A), lda, int(x), incx,
                                         ctypes.byref(ctypes.c_float(beta)),
                                         int(y), incy)
      cublasCheckStatus(status)
docs: Matrix-vector product for real symmetric-banded matrix.