def METHOD_NAME(o: np.ndarray, y: np.ndarray, x: np.ndarray) -> float:
    """Calculate the angle between two vectors.
    Args:
        o: coordination of the origin.
        y: end point of the first vector.
        x: end point of the second vector.
    Returns:
        The angle between the two vectors.
    """
    yo = y - o
    norm_yo = yo / scipy.linalg.norm(yo)
    xo = x - o
    norm_xo = xo / scipy.linalg.norm(xo)
    angle = np.arccos(norm_yo.T * norm_xo)
    return angle