code: def test_dimension_comparison_value_format_unequal(self):
      # Comparing callables is skipped
      self.assertEqual(self.dimension12, self.dimension13)
      self.assertNotEqual(
          str(self.dimension12.value_format),
          str(self.dimension13.value_format),
      )
  
imports: from holoviews.core import Dimension, Dimensioned
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 13 for calling the DimensionsComparisonTestCase obj's underlying member method code with example usage: obj.test_dimension_comparison_value_format_unequal() without return types