code: def isinf(val):
      # Infinity times zero equals NaN.
      return not isnan(val) and isnan(val * 0)
  
imports: import copy
  import math
  import operator
  import pickle
  import unittest
  from google.protobuf import unittest_import_pb2
  from google.protobuf import unittest_pb2
  from google.protobuf.internal import api_implementation
  from google.protobuf.internal import test_util
  from google.protobuf import message
label_desc: Use image node_id 2 for calling a global function with example usage: isinf(val) and returns: unknown