class_docstr: Tests functions that use registry
class_docstr_tok: ["Tests","functions","that","use","registry"]
code: def test_build_dataset(self):
      dataset = build_dataset(DUMMY_CONFIG, DUMMY_SAMPLES_1)
      self.assertTrue(isinstance(dataset, TestVideoDataset))
  
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 TestRegistryFunctions obj's underlying member method code with example usage: obj.test_build_dataset() without return types