class_docstr: A GPU Graph Object (Base class of other graph types)
  
  Parameters
  ----------
  m_graph : cuGraph.MultiGraph object or None (default=None)
      Initialize the graph from a cugraph.MultiGraph object
  directed : boolean, optional (default=False)
      Indicated is the graph is directed.
  
  Examples
  --------
  >>> # undirected graph
  >>> G = cugraph.Graph()
  >>> # directed graph
  >>> G = cugraph.Graph(directed=True)
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docstr: Returns True if the graph is a directed graph.
  Returns False if the graph is an undirected graph.
docstr_tok: ["Returns","True","if","the","graph","is","a","directed","graph",".","Returns","False","if","the","graph","is","an","undirected","graph","."]
code: def is_directed(self):
      """
      Returns True if the graph is a directed graph.
      Returns False if the graph is an undirected graph.
      """
      return self.graph_properties.directed
  
imports: import numpy
  from .graph_implementation import simpleGraphImpl, simpleDistributedGraphImpl, npartiteGraphImpl
  import cudf
  import dask_cudf
  from cugraph.utilities.utils import import_optional
label_desc: Use image node_id 18 for calling the Graph obj's underlying member method code with example usage: obj.is_directed() and returns: self