code: def test_scatter3d_size(self):
      scatter = Scatter3D(([0, 1], [2, 3], [4, 5])).opts(size="y")
      state = self._get_plot_state(scatter)
      self.assertEqual(
          state["data"][0]["marker"]["size"], np.array([2, 3])
      )
  
file_path: holoviews/holoviews/tests/plotting/plotly/test_scatter3dplot.py
imports: import numpy
  from holoviews.element import Scatter3D
  from .test_plot import TestPlotlyPlot
label_desc: Use image node_id 3 for calling the TestScatter3DPlot obj's underlying member method code with example usage: obj.test_scatter3d_size() without return types