code: def __init__(self):
      pass
  
imports: import pytest
  import ray
  from ray.train import Checkpoint, CheckpointConfig, ScalingConfig
  from ray.air._internal.config import ensure_only_allowed_dataclass_keys_updated
  from ray.data.preprocessor import Preprocessor
  from ray.train.trainer import BaseTrainer
label_desc: Use image node_id 1 to create a new DummyDataset object from inherited base classes: ray.data with example: obj = DummyDataset()