>>> import torch.utils.data
>>> isinstance(train_set, torch.utils.data.Dataset)
True
>>> len(train_set)
354
>>> train_set[0]
(
  <PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=320x263 at 0x7F4CFE7E52D0>,
  Target(
    annotations=FrameAnnotations(tags=[
      {
        'attributes': [],
        'frame': 0,
        'group': None,
        'id': 426655,
        'label_id': 431494,
        'source': 'manual'
      }
    ], shapes=[]),
    label_id_to_index=mappingproxy({431492: 0, 431493: 1, 431494: 2, 431495: 3, 431496: 4})
  )
)