fix learner with missing updater
fix learner with missing updater

jamesjia94/BIDMach,ypkang/BIDMach,yanqingmen/BIDMach,jamesjia94/BIDMach,pkalipatnapu/BIDMach,ypkang/BIDMach,ypkang/BIDMach,BIDData/BIDMach,pkalipatnapu/BIDMach,uhjish/BIDMach,yanqingmen/BIDMach,BIDData/BIDMach,AnnaZhou/BIDMach,uhjish/BIDMach,yanqingmen/BIDMach,yanqingmen/BIDMach,yanqingmen/BIDMach,AnnaZhou/BIDMach,uhjish/BIDMach,pkalipatnapu/BIDMach,ypkang/BIDMach,uhjish/BIDMach,jamesjia94/BIDMach,jamesjia94/BIDMach,uhjish/BIDMach,AnnaZhou/BIDMach,geneyoo/BIDMach,geneyoo/BIDMach,geneyoo/BIDMach,BIDData/BIDMach,jamesjia94/BIDMach,geneyoo/BIDMach,ypkang/BIDMach,AnnaZhou/BIDMach,BIDData/BIDMach,pkalipatnapu/BIDMach,AnnaZhou/BIDMach,yanqingmen/BIDMach,geneyoo/BIDMach,pkalipatnapu/BIDMach,BIDData/BIDMach,geneyoo/BIDMach,BIDData/BIDMach,uhjish/BIDMach,ypkang/BIDMach,AnnaZhou/BIDMach,pkalipatnapu/BIDMach,jamesjia94/BIDMach