Added some missing casts
Added some missing casts

kamigaito/cnn,Abasyoni/dynet,Abasyoni/dynet,cherryc/dynet,mitchellstern/dynet,cherryc/dynet,Peilun-Li/dynet,cherryc/dynet,kamigaito/cnn,mitchellstern/dynet,Peilun-Li/dynet,Peilun-Li/dynet,Abasyoni/dynet