docstr: Returns True if the graph contains the node n.
docstr_tok: ["Returns","True","if","the","graph","contains","the","node","n","."]
code: def has_node(self, n):
      """
      Returns True if the graph contains the node n.
      """
  
      return (self.nodes() == n).any().any()
  
imports: from cugraph.structure import graph_primtypes_wrapper
  from cugraph.structure.graph_primtypes_wrapper import Direction
  from cugraph.structure.symmetrize import symmetrize
  from cugraph.structure.number_map import NumberMap
  import cugraph.dask.common.mg_utils
  import cudf
  import dask_cudf
  import cugraph.dask.comms.comms
  import pandas
  import numpy
  import warnings
  from cugraph.dask.structure import replication
  from typing import Union, Dict
  from pylibcugraph import get_two_hop_neighbors, select_random_vertices
  from pylibcugraph import ResourceHandle, GraphProperties, SGGraph
label_desc: Use image node_id 30 for calling the simpleGraphImpl obj's underlying member method code with example usage: obj.has_node(n) and returns: unknown