def METHOD_NAME(pred, gt):
    """
    Desc:
        Mean Square Error
    Args:
        pred:
        gt: ground truth vector
    Returns:
        MSE value
    """
    _mse = 0.
    if len(pred) > 0 and len(gt) > 0:
        _mse = np.mean((pred - gt)**2)
    return _mse