Revert "remove ml_classifieres from depend"

This reverts commit 7046bc84ef918fe808b032b37225bd96e08eb423.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit c49dc05e30badfc31b3e8f2c4cc3635934af1bbc.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend