Revert "remove ml_classifieres from depend"

This reverts commit 49691c941543408bd0d7d5095eb0e8ca6a30303e.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 04ebf72167c605652e836724999764373bc3102c.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend