code: def _trainer_init_pre_middleware(
      self, trainer, *args: Any, **kwargs: Any
  ):
      if self.node_rank != 0:
          return {}, args, kwargs
  
      from lightning.pytorch.serve import ServableModuleValidator
  
      callbacks = kwargs.get("callbacks", [])
      if self.sanity_serving:
          callbacks = callbacks + [ServableModuleValidator()]
      kwargs["callbacks"] = callbacks
      return {}, args, kwargs
  
imports: import os
  from typing import Any, Dict, List, Optional, Tuple, Type, Union
  from lightning.app.components.python import TracerPythonScript
  from lightning.app.core.flow import LightningFlow
  from lightning.app.storage.path import Path
  from lightning.app.structures import List
  from lightning.app.utilities.app_helpers import Logger
  from lightning.app.utilities.packaging.cloud_compute import CloudCompute
label_desc: Use image node_id 5 for calling the PyTorchLightningScriptRunner obj's underlying member method code with example usage: obj._trainer_init_pre_middleware(trainer) and returns: dict,  args,  kwargs, dict,  args,  kwargs