code: def test_label_size_op_update(self):
      labels = HoloMap(
          {
              0: Labels(
                  [(0, 0, 8), (0, 1, 6), (0, 2, 12)], vdims="size"
              ),
              1: Labels(
                  [(0, 0, 9), (0, 1, 4), (0, 2, 3)], vdims="size"
              ),
          }
      ).opts(size="size")
      plot = mpl_renderer.get_plot(labels)
      artist = plot.handles["artist"]
      self.assertEqual([a.get_fontsize() for a in artist], [8, 6, 12])
      plot.update((1,))
      artist = plot.handles["artist"]
      self.assertEqual([a.get_fontsize() for a in artist], [9, 4, 3])
  
imports: import numpy
  from holoviews.core.dimension import Dimension
  from holoviews.core.options import Cycle
  from holoviews.core.spaces import HoloMap
  from holoviews.element import Labels
  from holoviews.plotting.util import rgb2hex
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 11 for calling the TestLabelsPlot obj's underlying member method code with example usage: obj.test_label_size_op_update() without return types