code: def __init__(self, opt: Opt):
      super().__init__(opt)
      if not self.is_training:
          logging.info("No flipping in eval / test mode.")
      return
  
imports: from typing import Optional
  from parlai.core.message import Message
  from parlai.core.mutators import MessageMutator, register_mutator
  from parlai.core.opt import Opt
  from parlai.core.params import ParlaiParser
  from parlai.utils.data import DatatypeHelper
  import hashlib
  import parlai.utils.logging
  import copy
label_desc: Use image node_id 1 to create a new FlipClassificationLabelTrainOnlyMutator object from inherited base classes: FlipClassificationLabelMutator with example: obj = FlipClassificationLabelTrainOnlyMutator(opt)