code: def petersen_graph() -> StellarGraph:
      nxg = nx.petersen_graph()
      return StellarGraph.from_networkx(
          nxg, node_features=node_features()
      )
  
imports: from stellargraph import StellarGraph, StellarDiGraph, IndexedArray
  import networkx
  import pandas
  import numpy
  import random
  import pytest
label_desc: Use image node_id 12 for calling a global function with example usage: petersen_graph() and returns: StellarGraph