code: def test_idxmapping_init_dimdict(self):
      MultiDimensionalMapping(
          self.init_item_odict,
          kdims=[dict(name=label) for label in self.dimension_labels],
      )
  
imports: import numpy
  from holoviews import Dataset, HoloMap
  from holoviews.core import Dimension
  from holoviews.core.ndmapping import MultiDimensionalMapping, NdMapping, UniformNdMapping
  from holoviews.core.overlay import Overlay
  from holoviews.element import Curve
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 6 for calling the NdIndexableMappingTest obj's underlying member method code with example usage: obj.test_idxmapping_init_dimdict() without return types