Revert "Update rank system of MobiBench"

This reverts commit 6ad3349ecc0eb462795cdd7fe7834dc08c33eba5.
Revert "Revert "Update rank system of MobiBench""

This reverts commit 50b251c2508fc92870e16970831c53e56130815e.
Revert "Revert "Revert "Update rank system of MobiBench"""

This reverts commit 7675bf676e89ea1fad509fcc5eb867b775a221ff.