code: def topological_sort_traversal(g):
      return list(nx.topological_sort(g))
  
imports: import networkx
  import collections
  import time
  import copy
  from caffe2.python import workspace, core
  from caffe2.proto import caffe2_pb2
  import enum
  import logging
  import caffe2.python._import_c_extension
label_desc: Use image node_id 14 for calling a global function with example usage: topological_sort_traversal(g) and returns: list