pycnn_viz: avoid duplicating expression_name inside node
pycnn_viz: avoid duplicating expression_name inside node
Abasyoni/dynet,kamigaito/cnn,mitchellstern/dynet,kamigaito/cnn,dhgarrette/cnn,cherryc/dynet,Abasyoni/dynet,cherryc/dynet,dhgarrette/cnn,Peilun-Li/dynet,Peilun-Li/dynet,Abasyoni/dynet,Peilun-Li/dynet,cherryc/dynet,mitchellstern/dynet,dhgarrette/cnn