code: def generate_operation(self):
      if self.operator_state_backend is not None:
          return self.operation_cls(
              self.spec.serialized_fn, self.operator_state_backend
          )
      else:
          return self.operation_cls(self.spec.serialized_fn)
  
imports: import abc
  from abc import abstractmethod
  from typing import Iterable, Any, Dict, List
  from apache_beam.runners.worker.bundle_processor import TimerInfo, DataOutputOperation
  from apache_beam.runners.worker.operations import Operation
  from apache_beam.utils import windowed_value
  from apache_beam.utils.windowed_value import WindowedValue
  from pyflink.common.constants import DEFAULT_OUTPUT_TAG
  from pyflink.fn_execution.flink_fn_execution_pb2 import UserDefinedDataStreamFunction
  from pyflink.fn_execution.table.operations import BundleOperation
  from pyflink.fn_execution.profiler import Profiler
label_desc: Use image node_id 2 for calling the StatelessFunctionOperation obj's underlying member method code with example usage: obj.generate_operation() and returns: self, self