(積ん読)On comparison of feature selection algorithms
https://www.aaai.org/Papers/Workshops/2007/WS-07-05/WS07-05-007.pdf
whether to perform feature selection inside or outside the cross-validation loop
3.9 A Note About Feature Selection During Model Selection
より
特徴量選択を交差検証ループの内側または外側のどちらで実施するか(を詳細に議論)