code: def test_polygon_dtype(self):
      poly = Polygons(
          [{"x": [1, 2, 3], "y": [2, 0, 7]}], datatype=[self.datatype]
      )
      self.assertIs(poly.interface, self.interface)
      self.assertEqual(poly.interface.dtype(poly, "x"), "float64")
  
imports: from unittest import SkipTest
  import numpy
  import pandas
  from holoviews.core.data import Dataset, MultiInterface
  from holoviews.core.data.interface import DataError
  from holoviews.element import Polygons, Path
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.tests.core.data.test_multiinterface import MultiBaseInterfaceTest
  from geoviews.data.geom_dict import GeomDictInterface
label_desc: Use image node_id 2 for calling the MultiGeomDictInterfaceTest obj's underlying member method code with example usage: obj.test_polygon_dtype() without return types