Revert "remove ml_classifieres from depend"

This reverts commit e3bc8808ab1dcd7fe14f249e83ab78c69bc4fa6a.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 71efaa32d8c9df5f76485fb8ef0b9991def22fb9.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend