fix bug in init agg_buf
fix bug in init agg_buf

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