Remove some unused code.
Remove some unused code.

klucar/pachyderm,kunthar/pachyderm,sambooo/pachyderm,sambooo/pachyderm,klucar/pachyderm,ShengjieLuo/pachyderm,alexdebrie/pachyderm,sambooo/pachyderm,alexdebrie/pachyderm,klucar/pachyderm,ShengjieLuo/pachyderm,kunthar/pachyderm,alexdebrie/pachyderm,ShengjieLuo/pachyderm