[scikit-learn] unclear help file for sklearn.decomposition.pca

[Roman Yurchak]

On 16/10/17 17:16, Ismael Lemhadri wrote:
> My concern is actually not about not mentioning the scaling but about
> not mentioning the centering.
> That is, the sklearn PCA removes the mean but it does not mention it in
> the help file.

I think it's currently assumed given the definition of the PCA, but you 
are right, the subtraction of the mean and the relationship to the SVD 
decomposition (i.e. TruncatedSVD) could be more clearly stated in the 
docsting and in the user manual,
 
http://scikit-learn.org/stable/modules/decomposition.html#principal-component-analysis-pca

Feel free to open an issue on Github about it or to submit a pull 
request to improve the documentation,

-- 
Roman