class_docstr: Unit tests for the nearest neighbors builder class.
code: def tearDown(self):
      # Do any cleanup here
      pass
  
imports: import os
  import shutil
  from coremltools.models.utils import _is_macos
  import unittest
  from coremltools.models import MLModel
  from coremltools.models.nearest_neighbors import KNearestNeighborsClassifierBuilder
  from coremltools._deps import _HAS_SKLEARN
label_desc: Use image node_id 2 for calling the NearestNeighborsBuilderTest obj's underlying member method code with example usage: obj.tearDown() without return types