fix unidirectional model's parameter format (#12055)
fix unidirectional model's parameter format (#12055)

* fix unidirectional model's parameter format

* Update rnn_layer.py

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