Fix mxnet ctc_loss bug (#11834)
Fix mxnet ctc_loss bug (#11834)

* fix ctc_loss GPU bug

* add blank_label parameter for CTCLoss

* Revert "add blank_label parameter for CTCLoss"

This reverts commit aab11f7575580f88f5f27be14466d0deb4b4c456.

eric-haibin-lin/mxnet,dmlc/mxnet,sxjscience/mxnet,reminisce/mxnet,ptrendx/mxnet,leezu/mxnet,zhreshold/mxnet,eric-haibin-lin/mxnet,mbaijal/incubator-mxnet,larroy/mxnet,reminisce/mxnet,DickJC123/mxnet,mbaijal/incubator-mxnet,reminisce/mxnet,mbaijal/incubator-mxnet,szha/mxnet,tlby/mxnet,zhreshold/mxnet,yajiedesign/mxnet,reminisce/mxnet,apache/incubator-mxnet,eric-haibin-lin/mxnet,apache/incubator-mxnet,sxjscience/mxnet,zhreshold/mxnet,leezu/mxnet,zhreshold/mxnet,leezu/mxnet,dmlc/mxnet,larroy/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,tlby/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,szha/mxnet,ptrendx/mxnet,ptrendx/mxnet,larroy/mxnet,sxjscience/mxnet,leezu/mxnet,szha/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,apache/incubator-mxnet,ptrendx/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,tlby/mxnet,eric-haibin-lin/mxnet,dmlc/mxnet,leezu/mxnet,reminisce/mxnet,apache/incubator-mxnet,ptrendx/mxnet,leezu/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,leezu/mxnet,yajiedesign/mxnet,ptrendx/mxnet,szha/mxnet,ptrendx/mxnet,tlby/mxnet,dmlc/mxnet,mbaijal/incubator-mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,tlby/mxnet,zhreshold/mxnet,szha/mxnet,reminisce/mxnet,yajiedesign/mxnet,larroy/mxnet,reminisce/mxnet,DickJC123/mxnet,tlby/mxnet,sxjscience/mxnet,szha/mxnet,reminisce/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,yajiedesign/mxnet,dmlc/mxnet,zhreshold/mxnet,sxjscience/mxnet,sxjscience/mxnet,larroy/mxnet,larroy/mxnet,yajiedesign/mxnet,szha/mxnet,reminisce/mxnet,larroy/mxnet,dmlc/mxnet,larroy/mxnet,szha/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,ptrendx/mxnet,sxjscience/mxnet,yajiedesign/mxnet,mbaijal/incubator-mxnet,ptrendx/mxnet,mbaijal/incubator-mxnet,zhreshold/mxnet,mbaijal/incubator-mxnet,ForkedReposBak/mxnet,leezu/mxnet,ForkedReposBak/mxnet,ForkedReposBak/mxnet,szha/mxnet,DickJC123/mxnet,dmlc/mxnet,eric-haibin-lin/mxnet,DickJC123/mxnet,sxjscience/mxnet,leezu/mxnet,yajiedesign/mxnet,eric-haibin-lin/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,ptrendx/mxnet,dmlc/mxnet,larroy/mxnet