Fixed bizarre bug in cnn sparse input
Fixed bizarre bug in cnn sparse input

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