| is_isomorphic(G1, G2[, node_match, edge_match]) | Returns True if the graphs G1 and G2 are isomorphic and False otherwise. |
| could_be_isomorphic(G1, G2) | Returns False if graphs are definitely not isomorphic. |
| fast_could_be_isomorphic(G1, G2) | Returns False if graphs are definitely not isomorphic. |
| faster_could_be_isomorphic(G1, G2) | Returns False if graphs are definitely not isomorphic. |