Speed up kl_div computation#6

Merged

xiaoyunwu merged 2 commits intotaskgraph:masterfrom

5kg:speed_up_kl_div

Jul 1, 2015

Commits on Jun 23, 2015

Update bwmf.pb.go based on new proto definition
zifeitong
committed

Commits on Jun 30, 2015

Reduce time complexity of kl_div from O(m*n*k) to O(m*k+n*k)
zifeitong
committed