code: def test_dimensioned_comparison_unequal_group(self):
      try:
          self.assertEqual(self.dimensioned1, self.dimensioned6)
      except AssertionError as e:
          self.assertEqual(str(e), "Group labels mismatched.")
  
imports: from holoviews.core import Dimension, Dimensioned
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 7 for calling the DimensionedComparisonTestCase obj's underlying member method code with example usage: obj.test_dimensioned_comparison_unequal_group() without return types