code: def test_dilation2():
      # test equality of cython and python versions
      myfield = basic_field()
      myfield.field[555] = 30
      myfield.field[664] = 0
      h = myfield.copy()
      h.dilation(2)
      g = myfield.copy()
      g.dilation(2, False)
      assert_array_equal(h.field, g.field)
  
imports: import numpy
  import numpy.random
  from numpy.testing import assert_array_equal
  from ..field import field_from_coo_matrix_and_data, field_from_graph_and_data
  from ..graph import wgraph_from_3d_grid
label_desc: Use image node_id 14 for calling a global function with example usage: test_dilation2() without return types