refactor ps::worker
refactor ps::worker

jiajiechen/mxnet,Prasad9/incubator-mxnet,DR08/mxnet,precedenceguo/mxnet,fullfanta/mxnet,dmlc/mxnet,Ldpe2G/mxnet,Northrend/mxnet,indhub/mxnet,eric-haibin-lin/mxnet,jiajiechen/mxnet,reminisce/mxnet,arikpoz/mxnet,jennyzhang0215/incubator-mxnet,EvanzzzZ/mxnet,wangyum/mxnet,szha/mxnet,fullfanta/mxnet,fullfanta/mxnet,weleen/mxnet,Ldpe2G/mxnet,jiajiechen/mxnet,Mega-DatA-Lab/mxnet,nicklhy/mxnet,apaleyes/mxnet,ZihengJiang/mxnet,smolix/incubator-mxnet,tornadomeet/mxnet,dmlc/mxnet,antoan2/incubator-mxnet,gautamkmr/incubator-mxnet,larroy/mxnet,piiswrong/mxnet,yajiedesign/mxnet,antoan2/incubator-mxnet,yajiedesign/mxnet,lxn2/mxnet,likelyzhao/mxnet,eric-haibin-lin/mxnet,Ldpe2G/mxnet,weleen/mxnet,tlby/mxnet,antoan2/incubator-mxnet,sxjscience/mxnet,kevinthesun/mxnet,DR08/mxnet,thirdwing/mxnet,mbaijal/incubator-mxnet,EvanzzzZ/mxnet,thirdwing/mxnet,solin319/incubator-mxnet,sxjscience/mxnet,madjam/mxnet,arank/mxnet,hotpxl/mxnet,thirdwing/mxnet,yajiedesign/mxnet,precedenceguo/mxnet,hotpxl/mxnet,zhreshold/mxnet,piiswrong/mxnet,arikpoz/mxnet,Northrend/mxnet,nicklhy/mxnet,crazy-cat/incubator-mxnet,formath/mxnet,kkk669/mxnet,piiswrong/mxnet,ykim362/mxnet,ykim362/mxnet,smolix/incubator-mxnet,yajiedesign/mxnet,eric-haibin-lin/mxnet,rishita/mxnet,indhub/mxnet,luoyetx/mxnet,reminisce/mxnet,formath/mxnet,luoyetx/mxnet,solin319/incubator-mxnet,vikingMei/mxnet,nicklhy/mxnet,wangyum/mxnet,tlby/mxnet,hpi-xnor/BMXNet,xcgoner/dist-mxnet,CodingCat/mxnet,szha/mxnet,yuruofeifei/mxnet,tornadomeet/mxnet,luoyetx/mxnet,jiajiechen/mxnet,jamesliu/mxnet,kevinthesun/mxnet,larroy/mxnet,TuSimple/mxnet,jamesliu/mxnet,DR08/mxnet,TuSimple/mxnet,danithaca/mxnet,ForkedReposBak/mxnet,luoyetx/mxnet,vikingMei/mxnet,lxn2/mxnet,TuSimple/mxnet,yajiedesign/mxnet,mbaijal/incubator-mxnet,hpi-xnor/BMXNet,Ldpe2G/mxnet,zhreshold/mxnet,Prasad9/incubator-mxnet,mbaijal/incubator-mxnet,hotpxl/mxnet,rishita/mxnet,Guneet-Dhillon/mxnet,reminisce/mxnet,indhub/mxnet,larroy/mxnet,lxn2/mxnet,indhub/mxnet,pluskid/mxnet,jamesliu/mxnet,solin319/incubator-mxnet,CodingCat/mxnet,tornadomeet/mxnet,smolix/incubator-mxnet,rahul003/mxnet,gautamkmr/incubator-mxnet,navrasio/mxnet,reminisce/mxnet,madjam/mxnet,rahul003/mxnet,rishita/mxnet,rahul003/mxnet,xcgoner/dist-mxnet,Guneet-Dhillon/mxnet,Northrend/mxnet,pluskid/mxnet,LinkHS/incubator-mxnet,stefanhenneking/mxnet,tlby/mxnet,arikpoz/mxnet,Prasad9/incubator-mxnet,apaleyes/mxnet,apaleyes/mxnet,ZihengJiang/mxnet,lxn2/mxnet,gautamkmr/incubator-mxnet,larroy/mxnet,LinkHS/incubator-mxnet,likelyzhao/mxnet,leezu/mxnet,yajiedesign/mxnet,Guneet-Dhillon/mxnet,hpi-xnor/BMXNet,CodingCat/mxnet,hpi-xnor/BMXNet,dmlc/mxnet,fullfanta/mxnet,Ldpe2G/mxnet,Northrend/mxnet,sergeykolychev/mxnet,jermainewang/mxnet,stefanhenneking/mxnet,xcgoner/dist-mxnet,apache/incubator-mxnet,gautamkmr/incubator-mxnet,jiajiechen/mxnet,Northrend/mxnet,weleen/mxnet,Guneet-Dhillon/mxnet,ptrendx/mxnet,solin319/incubator-mxnet,crazy-cat/incubator-mxnet,gautamkmr/incubator-mxnet,danithaca/mxnet,ykim362/mxnet,szha/mxnet,saurabh3949/mxnet,leezu/mxnet,kevinthesun/mxnet,danithaca/mxnet,rahul003/mxnet,jermainewang/mxnet,rishita/mxnet,reminisce/mxnet,likelyzhao/mxnet,madjam/mxnet,danithaca/mxnet,rishita/mxnet,DickJC123/mxnet,Northrend/mxnet,sxjscience/mxnet,LinkHS/incubator-mxnet,luoyetx/mxnet,vikingMei/mxnet,piiswrong/mxnet,piiswrong/mxnet,pluskid/mxnet,ForkedReposBak/mxnet,reminisce/mxnet,rishita/mxnet,yuruofeifei/mxnet,arank/mxnet,apache/incubator-mxnet,apache/incubator-mxnet,tornadomeet/mxnet,likelyzhao/mxnet,dmlc/mxnet,saurabh3949/mxnet,precedenceguo/mxnet,fullfanta/mxnet,mbaijal/incubator-mxnet,smolix/incubator-mxnet,hotpxl/mxnet,wangyum/mxnet,antoan2/incubator-mxnet,eric-haibin-lin/mxnet,stefanhenneking/mxnet,leezu/mxnet,szha/mxnet,jennyzhang0215/incubator-mxnet,ptrendx/mxnet,pluskid/mxnet,xcgoner/dist-mxnet,sergeykolychev/mxnet,LinkHS/incubator-mxnet,ptrendx/mxnet,kkk669/mxnet,jermainewang/mxnet,CodingCat/mxnet,solin319/incubator-mxnet,ptrendx/mxnet,thirdwing/mxnet,rishita/mxnet,arank/mxnet,madjam/mxnet,jiajiechen/mxnet,nicklhy/mxnet,crazy-cat/incubator-mxnet,arank/mxnet,hesseltuinhof/mxnet,lxn2/mxnet,arikpoz/mxnet,indhub/mxnet,thirdwing/mxnet,sergeykolychev/mxnet,DR08/mxnet,thirdwing/mxnet,sergeykolychev/mxnet,smolix/incubator-mxnet,vikingMei/mxnet,tlby/mxnet,kkk669/mxnet,coder-james/mxnet,weleen/mxnet,sergeykolychev/mxnet,xcgoner/dist-mxnet,larroy/mxnet,CodingCat/mxnet,thirdwing/mxnet,ykim362/mxnet,jamesliu/mxnet,ShownX/incubator-mxnet,crazy-cat/incubator-mxnet,apaleyes/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,dmlc/mxnet,EvanzzzZ/mxnet,weleen/mxnet,lxn2/mxnet,TuSimple/mxnet,hotpxl/mxnet,tlby/mxnet,yuruofeifei/mxnet,jamesliu/mxnet,rahul003/mxnet,Ldpe2G/mxnet,jermainewang/mxnet,EvanzzzZ/mxnet,hpi-xnor/BMXNet,ZihengJiang/mxnet,EvanzzzZ/mxnet,tornadomeet/mxnet,saurabh3949/mxnet,hotpxl/mxnet,ShownX/incubator-mxnet,ShownX/incubator-mxnet,indhub/mxnet,reminisce/mxnet,formath/mxnet,CodingCat/mxnet,Mega-DatA-Lab/mxnet,kevinthesun/mxnet,LinkHS/incubator-mxnet,precedenceguo/mxnet,apaleyes/mxnet,navrasio/mxnet,dmlc/mxnet,formath/mxnet,zhreshold/mxnet,sxjscience/mxnet,LinkHS/incubator-mxnet,hesseltuinhof/mxnet,sxjscience/mxnet,reminisce/mxnet,tornadomeet/mxnet,madjam/mxnet,yuruofeifei/mxnet,smolix/incubator-mxnet,jiajiechen/mxnet,nicklhy/mxnet,navrasio/mxnet,pluskid/mxnet,lxn2/mxnet,larroy/mxnet,saurabh3949/mxnet,Guneet-Dhillon/mxnet,coder-james/mxnet,nicklhy/mxnet,Guneet-Dhillon/mxnet,navrasio/mxnet,hpi-xnor/BMXNet,EvanzzzZ/mxnet,arank/mxnet,sxjscience/mxnet,rishita/mxnet,ptrendx/mxnet,zhreshold/mxnet,ShownX/incubator-mxnet,jennyzhang0215/incubator-mxnet,arank/mxnet,jennyzhang0215/incubator-mxnet,smolix/incubator-mxnet,lxn2/mxnet,Ldpe2G/mxnet,yajiedesign/mxnet,solin319/incubator-mxnet,yuruofeifei/mxnet,rahul003/mxnet,sxjscience/mxnet,DR08/mxnet,EvanzzzZ/mxnet,precedenceguo/mxnet,saurabh3949/mxnet,hesseltuinhof/mxnet,arikpoz/mxnet,danithaca/mxnet,saurabh3949/mxnet,DR08/mxnet,madjam/mxnet,wangyum/mxnet,pluskid/mxnet,formath/mxnet,leezu/mxnet,ykim362/mxnet,weleen/mxnet,leezu/mxnet,jennyzhang0215/incubator-mxnet,Guneet-Dhillon/mxnet,luoyetx/mxnet,dmlc/mxnet,tornadomeet/mxnet,szha/mxnet,zhreshold/mxnet,hpi-xnor/BMXNet,nicklhy/mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,coder-james/mxnet,tornadomeet/mxnet,ForkedReposBak/mxnet,kkk669/mxnet,apaleyes/mxnet,hotpxl/mxnet,wangyum/mxnet,zhreshold/mxnet,ShownX/incubator-mxnet,CodingCat/mxnet,piiswrong/mxnet,jermainewang/mxnet,arikpoz/mxnet,DR08/mxnet,vikingMei/mxnet,jiajiechen/mxnet,hpi-xnor/BMXNet,pluskid/mxnet,yuruofeifei/mxnet,leezu/mxnet,hesseltuinhof/mxnet,coder-james/mxnet,madjam/mxnet,jennyzhang0215/incubator-mxnet,kevinthesun/mxnet,eric-haibin-lin/mxnet,ZihengJiang/mxnet,kkk669/mxnet,hesseltuinhof/mxnet,hotpxl/mxnet,tlby/mxnet,stefanhenneking/mxnet,fullfanta/mxnet,TuSimple/mxnet,TuSimple/mxnet,antoan2/incubator-mxnet,arank/mxnet,coder-james/mxnet,gautamkmr/incubator-mxnet,ForkedReposBak/mxnet,stefanhenneking/mxnet,ShownX/incubator-mxnet,jermainewang/mxnet,hesseltuinhof/mxnet,fullfanta/mxnet,precedenceguo/mxnet,vikingMei/mxnet,jennyzhang0215/incubator-mxnet,yuruofeifei/mxnet,larroy/mxnet,weleen/mxnet,stefanhenneking/mxnet,danithaca/mxnet,coder-james/mxnet,smolix/incubator-mxnet,yajiedesign/mxnet,szha/mxnet,likelyzhao/mxnet,jennyzhang0215/incubator-mxnet,DR08/mxnet,rahul003/mxnet,piiswrong/mxnet,ZihengJiang/mxnet,Prasad9/incubator-mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,ptrendx/mxnet,danithaca/mxnet,CodingCat/mxnet,pluskid/mxnet,formath/mxnet,navrasio/mxnet,wangyum/mxnet,arikpoz/mxnet,larroy/mxnet,antoan2/incubator-mxnet,xcgoner/dist-mxnet,mbaijal/incubator-mxnet,hesseltuinhof/mxnet,eric-haibin-lin/mxnet,Northrend/mxnet,tlby/mxnet,jiajiechen/mxnet,ptrendx/mxnet,saurabh3949/mxnet,crazy-cat/incubator-mxnet,weleen/mxnet,thirdwing/mxnet,ptrendx/mxnet,yuruofeifei/mxnet,Guneet-Dhillon/mxnet,ShownX/incubator-mxnet,mbaijal/incubator-mxnet,danithaca/mxnet,leezu/mxnet,antoan2/incubator-mxnet,ShownX/incubator-mxnet,ZihengJiang/mxnet,Mega-DatA-Lab/mxnet,arank/mxnet,piiswrong/mxnet,kevinthesun/mxnet,indhub/mxnet,ForkedReposBak/mxnet,vikingMei/mxnet,hotpxl/mxnet,rishita/mxnet,Prasad9/incubator-mxnet,kkk669/mxnet,jermainewang/mxnet,luoyetx/mxnet,LinkHS/incubator-mxnet,jamesliu/mxnet,pluskid/mxnet,wangyum/mxnet,DickJC123/mxnet,crazy-cat/incubator-mxnet,likelyzhao/mxnet,piiswrong/mxnet,Prasad9/incubator-mxnet,dmlc/mxnet,luoyetx/mxnet,hesseltuinhof/mxnet,vikingMei/mxnet,navrasio/mxnet,kkk669/mxnet,antoan2/incubator-mxnet,sergeykolychev/mxnet,TuSimple/mxnet,ykim362/mxnet,gautamkmr/incubator-mxnet,LinkHS/incubator-mxnet,jamesliu/mxnet,kevinthesun/mxnet,nicklhy/mxnet,CodingCat/mxnet,hpi-xnor/BMXNet,ykim362/mxnet,Prasad9/incubator-mxnet,wangyum/mxnet,TuSimple/mxnet,kevinthesun/mxnet,navrasio/mxnet,jamesliu/mxnet,sergeykolychev/mxnet,Mega-DatA-Lab/mxnet,dmlc/mxnet,reminisce/mxnet,LinkHS/incubator-mxnet,tlby/mxnet,solin319/incubator-mxnet,saurabh3949/mxnet,apache/incubator-mxnet,Prasad9/incubator-mxnet,Mega-DatA-Lab/mxnet,Northrend/mxnet,fullfanta/mxnet,stefanhenneking/mxnet,xcgoner/dist-mxnet,smolix/incubator-mxnet,coder-james/mxnet,xcgoner/dist-mxnet,TuSimple/mxnet,sxjscience/mxnet,EvanzzzZ/mxnet,jermainewang/mxnet,weleen/mxnet,navrasio/mxnet,danithaca/mxnet,zhreshold/mxnet,crazy-cat/incubator-mxnet,precedenceguo/mxnet,rahul003/mxnet,lxn2/mxnet,indhub/mxnet,hesseltuinhof/mxnet,zhreshold/mxnet,yajiedesign/mxnet,likelyzhao/mxnet,jamesliu/mxnet,mbaijal/incubator-mxnet,mbaijal/incubator-mxnet,antoan2/incubator-mxnet,szha/mxnet,kkk669/mxnet,DR08/mxnet,Ldpe2G/mxnet,Ldpe2G/mxnet,sergeykolychev/mxnet,ShownX/incubator-mxnet,precedenceguo/mxnet,ykim362/mxnet,kevinthesun/mxnet,coder-james/mxnet,Prasad9/incubator-mxnet,larroy/mxnet,nicklhy/mxnet,fullfanta/mxnet,formath/mxnet,tornadomeet/mxnet,Guneet-Dhillon/mxnet,szha/mxnet,Mega-DatA-Lab/mxnet,leezu/mxnet,leezu/mxnet,solin319/incubator-mxnet,DickJC123/mxnet,Mega-DatA-Lab/mxnet,reminisce/mxnet,gautamkmr/incubator-mxnet,navrasio/mxnet,ZihengJiang/mxnet,ptrendx/mxnet,rahul003/mxnet,ykim362/mxnet,EvanzzzZ/mxnet,thirdwing/mxnet,sergeykolychev/mxnet,precedenceguo/mxnet,formath/mxnet,ForkedReposBak/mxnet,Mega-DatA-Lab/mxnet,stefanhenneking/mxnet,saurabh3949/mxnet,stefanhenneking/mxnet,Mega-DatA-Lab/mxnet,coder-james/mxnet,crazy-cat/incubator-mxnet,apaleyes/mxnet,apaleyes/mxnet,Northrend/mxnet,ptrendx/mxnet,jermainewang/mxnet,xcgoner/dist-mxnet,ZihengJiang/mxnet,ZihengJiang/mxnet,vikingMei/mxnet,likelyzhao/mxnet,DickJC123/mxnet,gautamkmr/incubator-mxnet,madjam/mxnet,yuruofeifei/mxnet,tlby/mxnet,formath/mxnet,jennyzhang0215/incubator-mxnet,luoyetx/mxnet,TuSimple/mxnet,kkk669/mxnet,madjam/mxnet,likelyzhao/mxnet,indhub/mxnet,szha/mxnet,wangyum/mxnet,tlby/mxnet,crazy-cat/incubator-mxnet,arank/mxnet,solin319/incubator-mxnet,mbaijal/incubator-mxnet,arikpoz/mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,arikpoz/mxnet,apaleyes/mxnet