class_docstr: Tests ``GraphClassificationData``.
code: def test_smoke(self):
      dm = GraphClassificationData(batch_size=2)
      assert dm is not None
  
file_path: lightning-flash/tests/graph/classification/test_data.py
imports: import pytest
  from flash import DataKeys
  from flash.core.utilities.imports import _TOPIC_GRAPH_AVAILABLE, _TORCHVISION_AVAILABLE
  from flash.graph.classification.data import GraphClassificationData
  from flash.graph.classification.input_transform import GraphClassificationInputTransform, PyGTransformAdapter
label_desc: Use image node_id 1 for calling the TestGraphClassificationData obj's underlying member method code with example usage: obj.test_smoke() without return types