class_docstr: Tests member functions of ClassyVideoDataset.
class_docstr_tok: ["Tests","member","functions","of","ClassyVideoDataset","."]
code: def setUp(self):
      self.dataset = build_dataset(DUMMY_CONFIG, DUMMY_SAMPLES_1)
  
imports: import unittest
  import torch
  from classy_vision.dataset import build_dataset, register_dataset
  from classy_vision.dataset.classy_video_dataset import ClassyVideoDataset, MaxLengthClipSampler
  from classy_vision.dataset.core import ListDataset
  from classy_vision.dataset.transforms.util_video import build_video_field_transform_default
  from torch.utils.data import Sampler
label_desc: Use image node_id 1 for calling the TestClassyVideoDataset obj's underlying member method code with example usage: obj.setUp() without return types