Implemented logging of inputs per second
Implemented logging of inputs per second

Summary: Every time data is put into the logger, it checks if a second has passed. If so, it displays how many inputs were put in the last second.

Differential Revision: D4527148

fbshipit-source-id: f197eb975ed81111449705e0719d1e56f385fd8d

xzturn/caffe2,Yangqing/caffe2,bwasti/caffe2,bwasti/caffe2,xzturn/caffe2,davinwang/caffe2,pietern/caffe2,Yangqing/caffe2,Yangqing/caffe2,pietern/caffe2,bwasti/caffe2,Yangqing/caffe2,xzturn/caffe2,Yangqing/caffe2,sf-wind/caffe2,pietern/caffe2,davinwang/caffe2,xzturn/caffe2,bwasti/caffe2,sf-wind/caffe2,sf-wind/caffe2,davinwang/caffe2,davinwang/caffe2,caffe2/caffe2,pietern/caffe2,sf-wind/caffe2,pietern/caffe2,davinwang/caffe2,sf-wind/caffe2,xzturn/caffe2,bwasti/caffe2