Machine learning models (mainly neural networks) are used more and more in real life. Users feed their data to the model for training. But these processes are often one-way. Once trained, the model remembers the data. Even when data is removed from the dataset, the effects of these data persist in the model. With more and more laws and regulations around the world protecting data privacy, it becomes even more important to make models forget this data completely through machine unlearning. This paper adopts the projection residual method based on Newton iteration method. The main purpose is to implement machine unlearning tasks in the context of linear regression models and neural network models. This method mainly uses the iterative weighting method to completely forget the data and its corresponding influence, and its computational cost is linear in the feature dimension of the data. This method can improve the current machine learning method. At the same time, it is independent of the size of the training set. Results were evaluated by feature injection testing (FIT). Experiments show that this method is more thorough in deleting data, which is close to model retraining.

该论文采用基于牛顿迭代方法的投影残差方法，旨在实现线性回归模型和神经网络模型的机器消遗任务。该方法主要使用迭代加权方法，完全忘记数据及其对应的影响，其计算成本与数据特征维度线性相关，并独立于训练集的大小。实验结果表明，该方法较近于模型重新训练，更彻底地删除数据。

基于投影残差的机器遗忘方法