code: def test_manhattan(self):
      self.assertAlmostEqual(
          manhattan(self.a, self.b),
          tc.distances.manhattan(self.a, self.b),
      )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import copy
  import unittest
  import numpy
  import turicreate
  from turicreate.toolkits._main import ToolkitError
  from collections import Counter
  import sys
label_desc: Use image node_id 4 for calling the StandardDistancesTest obj's underlying member method code with example usage: obj.test_manhattan() without return types