code: def is_test_list(self, iterable):
      return isinstance(iterable, TestList)
  
imports: from nvidia.dali._autograph.converters import directives
  from nvidia.dali._autograph.converters import lists
  from nvidia.dali._autograph.core import converter_testing
  from nvidia.dali._autograph.utils import hooks
label_desc: Use image node_id 1 for calling the OperatorList obj's underlying member method code with example usage: obj.is_test_list(iterable) and returns: isinstance