title: Generate mapping between two isomorphic graphs
body: <p>Two graphs G1 and G2 are isomorphic (is_isomorphic(G1, G2) => True) but have different attributes on each node. How can I obtain a mapping or dictionary between the value of attribute X from node Y on graph G1 and the value of attribute X from the "structurally-equivalent" node Y'. </p>
  
  <p>Best,
  Eric</p>