WIP: add optv4 heirarchy pic

Change-Id: I75a4cb107f95f80051b71e45247ad2bf7d5d366e
WIP: insert optv4 fig in tex file

Change-Id: Iff989ad879ecb7832e3b3ec26b4e1b50679b602f
WIP: revise optimizer part completely

Change-Id: Ib4328ff97990b75a11a8f0551de2318dbd15091c