code: def polygon_generator_device():
      def generator(n, num_vertices, radius=1.0, all_concentric=False):
          geometry_offsets = cp.arange(n + 1)
          part_offsets = cp.arange(n + 1)
  
          # Each polygon has a closed ring, so we need to add an extra point
          ring_offsets = cp.arange(
              (n + 1) * (num_vertices + 1), step=(num_vertices + 1)
          )
          num_points = int(ring_offsets[-1].get())
  
          if not all_concentric:
              centroids = cp.random.random((n, 2))
          else:
              centroids = cp.zeros((n, 2))
          coords = cp.ndarray((num_points * 2,), dtype="f8")
          generate_polygon_coordinates.forall(len(coords))(
              coords, centroids, radius, num_vertices
          )
          return cuspatial.GeoSeries.from_polygons_xy(
              coords, ring_offsets, part_offsets, geometry_offsets
          )
  
      return generator
  
imports: import cupy
  import geopandas
  import numpy
  import pandas
  import pytest
  import pytest_cases
  from numba import cuda
  from shapely.geometry import LineString, MultiLineString, MultiPoint, MultiPolygon, Point, Polygon
  import cudf
  import cuspatial
label_desc: Use image node_id 16 for calling a global function with example usage: polygon_generator_device() and returns: generator, cuspatial