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This mathematics course is taught for the first year Ph.D. students of computer science and related areas @ZJU

machine-learning mathematics-course python zhejiang-university

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csmath-2019's Issues

作业2的详细要求

张老师，作业2的详细要求是什么呀？

  1. 下载的数据集是使用哪个数据文件？是optdigits.tra吗？这个里面共有389个数字三，与PPT上说的638不一致啊
  2. 对所有数字一起降维，然后显示25个数字三，这25个数字三哪里来？
  3. 作图是只要把降维后的可视化显示出来就行还是也需要把那25个数字三也一并画出？

PCA与SVD降维的区别

张老师好：

在作业2中，对手写字进行降维。PPT中讲到了两种降维方法：一种是通过直接对归一化数据矩阵SVD实现降维，另一种是对归一化数据的离散度矩阵（协方差矩阵）特征分解降维。那这两种方法的有什么区别、降维结果都是一致的吗？

谢谢张老师~

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