判断是否有可能错误的两个伪标记，并将他们交换 :param y_u_pred: # 预测值 :param Y_u: # 伪标记 :return: y_u_pred # 原预测值 Y_u # 交换后的伪标记 Flag # 是否进行了交换
(y_u_pred, Y_u)
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nothing calls this directly
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