code: def example_graph_1_saliency_maps(feature_size=None):
      # saliency gcn, saliency gat
      nlist = [0, 1, 2, 3, 4]
      if feature_size is None:
          nodes = pd.DataFrame(index=nlist)
      else:
          # Example features
          nodes = pd.DataFrame(
              np.ones((len(nlist), feature_size)), index=nlist
          )
  
      elist = [
          (0, 1),
          (0, 2),
          (2, 3),
          (3, 4),
          (0, 0),
          (1, 1),
          (2, 2),
          (3, 3),
          (4, 4),
      ]
      edges = pd.DataFrame(elist, columns=["source", "target"])
  
      return StellarGraph(nodes, edges)
  
imports: from stellargraph import StellarGraph, StellarDiGraph, IndexedArray
  import networkx
  import pandas
  import numpy
  import random
  import pytest
label_desc: Use image node_id 9 for calling a global function with example usage: example_graph_1_saliency_maps(feature_size) and returns: StellarGraph