code: def test_first_stop_call(self):
      stopping_criterion = DeltaFScore(2)
  
      predictions = np.array([0, 1, 1, 0])
  
      stop = stopping_criterion.stop(predictions=predictions)
      self.assertFalse(stop)
  
      self.assertEqual([], stopping_criterion.delta_history)
      assert_array_equal(
          predictions, stopping_criterion.last_predictions
      )
  
file_path: small-text/tests/unit/small_text/stopping_criteria/test_base.py
imports: import unittest
  import numpy
  from numpy.testing import assert_array_equal, assert_array_almost_equal
  from small_text.stopping_criteria.base import DeltaFScore
label_desc: Use image node_id 4 for calling the DeltaFScoreTest obj's underlying member method code with example usage: obj.test_first_stop_call() without return types