Revert "remove ml_classifieres from depend"

This reverts commit 7068c6cfea5c1f27268b98e9e7661ad8c23a6854.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 1d8563de40448f9872d895ce33e1c3acd3b9153e.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend