system/dataset.py

@@ -263,6 +263,7 @@ class GraphDataset(Dataset):
         Dataset.__init__(self,array=array,identifiers=identifiers,name='A')
         self._graph = None
         self._type = 'g'
+        self._pos = None
         
     def asnetworkx(self,nx_type='graph'):
         dim = self.get_dim_name()[0]