code: def _check_metrics(self, metrics, params={}):
      self.assertEquals(
          metrics["num_errors"],
          0,
          msg="Failed case %s. Results %s" % (params, metrics),
      )
  
imports: import unittest
  import itertools
  import os
  import pandas
  import numpy
  from coremltools._deps import _HAS_SKLEARN, _SKLEARN_VERSION
  from coremltools.models.utils import evaluate_classifier, _macos_version, _is_macos
  from distutils.version import StrictVersion
  import pytest
label_desc: Use image node_id 1 for calling the RandomForestClassificationBostonHousingScikitNumericTest obj's underlying member method code with example usage: obj._check_metrics(metrics, params) without return types