code: def __init__(self, l, size):
      self.l = l
      self.size = size
  
file_path: ffcv/tests/test_memory_allocation.py
imports: import numpy
  from assertpy import assert_that
  from torch.utils.data import Dataset
  import logging
  import os
  from assertpy import assert_that
  from tempfile import NamedTemporaryFile
  from ffcv.writer import DatasetWriter
  from ffcv.reader import Reader
  from ffcv.fields import BytesField, IntField
label_desc: Use image node_id 1 to create a new DummyDataset object from inherited base classes: Dataset with example: obj = DummyDataset(l, size)