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python 实现PCA | 摸鱼且很菜blog #5

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@gyyc233

https://gyyc233.github.io/2021/06/03/python-%E5%AE%9E%E7%8E%B0PCA/#more

Principal Component Analysis PCA 一种非监督学习,常被用于数据降维、有损数据压缩、特征抽取、数据可视化。它也被称为Karhunen-Loève变换。 PCA的思想是将n维特征映射到k维空间上。k<n,这k维特征是全新的正交特征,是重新构造出来的k维特征,而不是简单地从n维特征中去除其余n−k维特征。

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