code: def test_dict(self) -> None:
      baseline_values = {
          "f1": [1, 2, 3],
          "f2": [4, 5, 6, 7],
          "f3": [8, 9],
      }
  
      baselines = ProductBaselines(
          cast(
              Dict[Union[str, Tuple[str, ...]], List[int]],
              baseline_values,
          )
      )
  
      baseline_sample = baselines()
  
      self.assertIsInstance(baseline_sample, dict)
      baseline_sample = cast(dict, baseline_sample)
  
      for sample_key, sample_val in baseline_sample.items():
          self.assertIn(sample_val, baseline_values[sample_key])
  
file_path: captum/tests/attr/test_baselines.py
imports: from typing import cast, Dict, List, Tuple, Union
  from captum.attr._utils.baselines import ProductBaselines
  from tests.helpers.basic import BaseTest
label_desc: Use image node_id 2 for calling the TestProductBaselines obj's underlying member method code with example usage: obj.test_dict() without return types