code: def test_set_nan():
      # As NaN != NaN, you can have multiple "NaN" points in a set
      # set([float("nan"), float("nan")]) also returns a set with 2 elements
      with ignore_invalid():
          a = set(
              shapely.linestrings(
                  [[[np.nan, np.nan], [np.nan, np.nan]]] * 10
              )
          )
      assert len(a) == 10
  
imports: import warnings
  import numpy
  import pytest
  import shapely
  from shapely import LinearRing, LineString, MultiPolygon, Point, Polygon
  from shapely.testing import assert_geometries_equal
  from shapely.tests.common import all_types
  from shapely.tests.common import empty
  from shapely.tests.common import empty_line_string, empty_line_string_z, empty_point, empty_point_z, empty_polygon, equal_geometries_abnormally_yield_unequal, geometry_collection, geometry_collection_z, ignore_invalid, ignore_warnings, line_string, line_string_nan, line_string_z, linear_ring, multi_line_string, multi_line_string_z, multi_point, multi_point_z, multi_polygon, multi_polygon_z, point, point_z, polygon, polygon_with_hole, polygon_with_hole_z, polygon_z
label_desc: Use image node_id 26 for calling a global function with example usage: test_set_nan() without return types