Revert "remove ml_classifieres from depend"

This reverts commit 2e9bb394ab6810a2cd50c4419609853637cea5de.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit 9c21f385e85443c74d7ea966278f8a5013572627.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend