code: def __init__(self, dataset_len):
      super().__init__()
      self.__dataset_len = dataset_len
  
imports: import os
  import shutil
  import torch
  from omegaconf import OmegaConf
  from pytorch_lightning import Trainer
  from pytorch_lightning.utilities import rank_zero_only
  from nemo.core import ModelPT
  from nemo.utils import logging
  from nemo.utils.exp_manager import ExpManagerConfig, exp_manager
label_desc: Use image node_id 1 to create a new OnesDataset object from inherited base classes: torch.utils.data with example: obj = OnesDataset(dataset_len)