code: def test_nnmark(I):
      ref = naive_nnmark(I)
      comp = _nnmark(I)
      npt.assert_almost_equal(ref, comp)
  
imports: import functools
  import naive
  import numpy
  import numpy.testing
  import pytest
  from stumpy import aamp, core, floss, fluss, stump
  from stumpy.floss import _cac, _iac, _nnmark, _rea
label_desc: Use image node_id 6 for calling a global function with example usage: test_nnmark(I) without return types