code: def test_predict_proba(self):
      res = self.tagger.predict_proba(self.sent)
      self.assertIsInstance(res, np.ndarray)
      self.assertEqual(len(res), len(self.sent.split()))
  
      res = self.tagger.predict_proba("Obama")
      self.assertIsInstance(res, np.ndarray)
      self.assertEqual(len(res), len("Obama".split()))
  
      with self.assertRaises(tf.errors.InvalidArgumentError):
          res = self.tagger.predict_proba("")
  
file_path: anago/tests/test_tagger.py
imports: import os
  import unittest
  import numpy
  import tensorflow
  import anago
  from anago.models import load_model
  from anago.preprocessing import IndexTransformer
label_desc: Use image node_id 2 for calling the TestTagger obj's underlying member method code with example usage: obj.test_predict_proba() without return types