'Initialize TimeRespectingDiGraphMatcher.
G1 and G2 should be nx.DiGraph or nx.MultiDiGraph instances.
Examples
To create a TimeRespectingDiGraphMatcher which checks for
syntactic and semantic feasibility:
>>> from networkx.algorithms import isomorphism
>>> G1 = nx.DiGraph(nx.path_graph(4, create_using=nx.DiGraph()))
>>> G2 = nx.DiGraph(nx.path_graph(4, create_using=nx.DiGraph()))
>>> GM = isomorphism.TimeRespectingDiGraphMatcher(G1, G2, \'date\', timedelta(days=1))'

def __init__(self, G1, G2, temporal_attribute_name, delta):

    self.temporal_attribute_name = temporal_attribute_name
    self.delta = delta
    super(TimeRespectingDiGraphMatcher, self).__init__(G1, G2)
