Revert "remove ml_classifieres from depend"

This reverts commit 2d6dc3e843f1a5f12f2fbc3701fb8959373cc0fb.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 166f68611b691a96c3415343ae9759017021a5de.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend