code: def setUp(self):
      self.init_items_1D_list = [(1, "a"), (5, "b")]
      self.init_item_list = [((1, 2.0), "a"), ((5, 3.0), "b")]
      self.init_item_odict = dict([((1, 2.0), "a"), ((5, 3.0), "b")])
      self.dimension_labels = ["intdim", "floatdim"]
      self.dim1 = Dimension("intdim", type=int)
      self.dim2 = Dimension("floatdim", type=float)
      self.time_dimension = Dimension
  
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 1 for calling the NdIndexableMappingTest obj's underlying member method code with example usage: obj.setUp() without return types