class_docstr: Unit test class for testing scikit-learn converter.
code: def test_evaluation(self):
      self._test_evaluation(allow_slow=False)
  
imports: import pandas
  import tempfile
  import random
  import unittest
  import pytest
  from coremltools._deps import _HAS_LIBSVM, MSG_LIBSVM_NOT_FOUND, _HAS_SKLEARN, MSG_SKLEARN_NOT_FOUND
  from coremltools.models.utils import evaluate_regressor, _macos_version, _is_macos
label_desc: Use image node_id 4 for calling the NuSVRScikitTest obj's underlying member method code with example usage: obj.test_evaluation() without return types