complete the pydotprint change that add the input number as label to edge.

theano/printing.py

@@ -410,6 +410,8 @@ def pydotprint(fct, outfile=os.path.join(config.compiledir,'theano.pydotprint.pn
         for id,var in enumerate(node.inputs):
             varstr=var_name(var)
             label=''
+            if len(node.inputs)>1:
+                label=str(id)
             if var.owner is None:
                 g.add_node(pd.Node(varstr,color='green'))
                 g.add_edge(pd.Edge(varstr,astr, label=label))