メモ！
https://qiita.com/jintaka1989/items/17c9ddd571b9b080828f https://qiita.com/jintaka1989/items/3b70b5c5541620536fa2 http://nnadl-ja.github.io/nnadl_site_ja/chap1.html https://qiita.com/icoxfog417/items/5fd55fad152231d706c2 http://nnadl-ja.github.io/nnadl_site_ja/chap6.html