Revert "remove ml_classifieres from depend"

This reverts commit 510f4f417e956046dfbba8fde5ff1080868736ef.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 75c6c63aed6222f7631f730662aacccb7de579e6.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend