code: def __init__(self, x):
      self.x = x
      self.length = 5
  
file_path: baal/tests/transformers_trainer_wrapper_test.py
imports: import unittest
  from copy import deepcopy
  import numpy
  import pytest
  import torch
  from transformers import GPT2LMHeadModel, GPT2Config
  from transformers import TrainingArguments
  from baal.transformers_trainer_wrapper import BaalTransformersTrainer
label_desc: Use image node_id 1 to create a new DummyDataset object  with example: obj = DummyDataset(x)