refactor code

Change-Id: Ia2bc49ed8742d79000fd59f7e95fa9b957573c54
diff --git a/AUTHORS.md b/AUTHORS.md
index 611744c..65a6920 100644
--- a/AUTHORS.md
+++ b/AUTHORS.md
@@ -3,6 +3,9 @@
 
 ## The primary authors are (and/or have been):
 
+* Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
+* Peizhen Guo <patrick.guopz@gmail.com>
+
 
 ## All project authors and contributors