class_docstr: Unit test class for an already trained model.
class_docstr_tok: ["Unit","test","class","for","an","already","trained","model","."]
code: def test_model_access(self):
      m = self.model.classifier
      self.assertTrue(
          isinstance(
              m, tc.classifier.logistic_classifier.LogisticClassifier
          )
      )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import tempfile
  import turicreate
  from turicreate.toolkits._main import ToolkitError
  from turicreate.toolkits._internal_utils import _mac_ver
  from .None import util
  import sys
label_desc: Use image node_id 4 for calling the TextClassifierTest obj's underlying member method code with example usage: obj.test_model_access() without return types