tree 199c14ad0ae395518e2fc50d3a4e960aeadd1fab
parent 7d979a7319e6612b3c2b9c61602b80e06ffdeb61
author Jiaxiang Chen <jiaxiang@google.com> 1597869294 -0700
committer Jiaxiang Chen <jiaxiang@google.com> 1598477545 -0700

fix variance calculation