def METHOD_NAME(self):
    """Get corner coordinates of boxes.
    Returns:
        a list of 4 1-d numpy arrays [y_min, x_min, y_max, x_max]
    """
    box_coordinates = self.get()
    y_min = box_coordinates[:, 0]
    x_min = box_coordinates[:, 1]
    y_max = box_coordinates[:, 2]
    x_max = box_coordinates[:, 3]
    return [y_min, x_min, y_max, x_max]