code: def test_self_distance(polygon_generator):
      N = 100
      polygons = gpd.GeoSeries(polygon_generator(N, 20.0, 5.0))
      polygons = cuspatial.from_geopandas(polygons)
      got = cuspatial.pairwise_polygon_distance(polygons, polygons)
      expect = cudf.Series(cp.zeros((N,)))
  
      assert_series_equal(got, expect)
  
file_path: cuspatial/python/cuspatial/cuspatial/tests/spatial/distance/test_pairwise_polygon_distance.py
imports: import cupy
  import geopandas
  import pytest
  from shapely.geometry import MultiPolygon, Polygon
  import cudf
  from cudf.testing import assert_series_equal
  import cuspatial
label_desc: Use image node_id 6 for calling a global function with example usage: test_self_distance(polygon_generator) without return types