def _angle(self, v1, v2):
        """ Compute the angle difference between two vectors

    :param v1: The x,y coordinates of the vector
    :type: v1: list
    :param v2: The x,y coordinates of the vector
    :type: v2: list
    :rtype: float

    """
        angle_diff = np.arctan2(v1[0], v1[1]) - np.arctan2(v2[0], v2[1])
        if 0 < angle_diff:
            angle_diff += 2 * np.pi
        return angle_diff
dataset/ETHPy150Open rlpy/rlpy/rlpy/Domains/Pinball.py/PinballObstacle._angle/swapped operands of `<`