def METHOD_NAME(self, dest, src):
    """perform a device to host memory copy
    :param dest: A numpy array in host memory to store the data
    :type dest: numpy.ndarray
    :param src: An OpenCL Buffer to copy data from
    :type src: pyopencl.Buffer
    """
    if isinstance(src, cl.Buffer):
        cl.enqueue_copy(self.queue, dest, src)