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2017-10-09 03:54
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（笔记总结需要！目前粗糙潦草，后期会不断修改。若对您阅读造成不便，望请见谅！！）
8. PCA
A dimensionality reduction algorithm that can be able to significantly speed up unsupervised feature learning algorithm. More importantly, understanding PCAs will enable us to later implement Whitening, which is an important pre-processing step for many algorithms.
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