Revert "remove ml_classifieres from depend"

This reverts commit 13d4947d32145dc3703f64016462e727b2129678.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 3cad299c18c4ad17a969c7d6c2f6172e9a2ad1aa.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend