Revert "remove ml_classifieres from depend"

This reverts commit 79ca3d72e7fc8fded20bf2992bb42f45bef007c5.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit e7c98a48716750ef834684eb7be88a8779bbaed9.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend