code: def __init__(self, train_loop, custom_arg=None, **kwargs):
      self.custom_arg = custom_arg
      self.train_loop = train_loop
      super().__init__(**kwargs)
  
imports: import logging
  import tempfile
  import pytest
  import ray
  from ray import train, tune
  from ray.air.constants import MAX_REPR_LENGTH
  from ray.data.context import DataContext
  from ray.train import Checkpoint, ScalingConfig
  from ray.train.gbdt_trainer import GBDTTrainer
  from ray.train.trainer import BaseTrainer
  from ray.util.placement_group import get_current_placement_group
label_desc: Use image node_id 1 to create a new DummyTrainer object from inherited base classes: BaseTrainer with example: obj = DummyTrainer(train_loop, custom_arg)