Revert "remove ml_classifieres from depend"

This reverts commit fe11a8077135df62d6b68973a174575e9f7f6deb.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 8481d999ac562c19ae56488d7c37681849910c6a.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend