Revert "remove ml_classifieres from depend"

This reverts commit be4014eb5cd1d1e3d27ccd41ec52f270b088939f.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 3256c47e5960dede629b4996b8ebcbdcf1f1fc81.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend