follow dev54, 1. do some format job to PyQCU/test/pyqcu/cuda, just like "def solver(b: cp_ndarray, matvec: Callable[[cp_ndarray], cp_ndarray], tol: float = 1e-6, max_iter: int = 1000, x0: cp_ndarray = None) -> cp_ndarray: ", just for easy to call functions in pyqcu.cuda; 2. add PyQCU/test/test-npX.x99-test5.sh & *.x99-test5.log, a recheck for "1". :)