Revert "remove ml_classifieres from depend"

This reverts commit 255a5319b199f3d3db38aeca6f7660358da4780e.
Revert "Trimmed the branch to only the 3rdparty/sklearn sub directory"

This reverts commit f4e21ce6f6b3127a9828052db4a9670b770df3a9.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/sklearn sub directory
remove ml_classifieres from depend