ref: 2e0553227e3b6a73e48c6038c9809f4b4c5eef47
parent: 2a5278bdbdc908ac994edb4dd2ba71c11eec6364
parent: f2407826503b53d05447f015811153e4fb4304d5
author: Yunqing Wang <yunqingwang@google.com>
date: Fri Mar 8 05:18:52 EST 2013
Merge "Optimize add_constant_residual function" into experimental