Revert "remove ml_classifieres from depend"

This reverts commit d9bec2d78ea43ff1af56e3577be09a6c5f28475a.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit ac88ee1b258a5b3c5919b1b20a3dd8a0e7564da6.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend