code: def test_stop_by_no_improvement(logs, base_extractor, metric_name):
      assert stop_by_no_improvement(
          logs, base_extractor, metric_name, early_stop=2, threshold=1
      )
      assert not stop_by_no_improvement(
          logs,
          base_extractor,
          metric_name,
          early_stop=2,
          threshold=0.000001,
      )
  
      assert stop_by_no_improvement(
          logs, base_extractor, metric_name, early_stop=2, threshold=0.4
      )
      assert not stop_by_no_improvement(
          logs, base_extractor, metric_name, early_stop=5, threshold=0.4
      )
  
file_path: fklearn/tests/tuning/test_stoppers.py
imports: import pytest
  from fklearn.metrics.pd_extractors import evaluator_extractor
  from fklearn.tuning.stoppers import stop_by_iter_num, stop_by_no_improvement, stop_by_num_features, stop_by_no_improvement_parallel, stop_by_num_features_parallel
  from tests import LOGS, PARALLEL_LOGS
label_desc: Use image node_id 6 for calling a global function with example usage: test_stop_by_no_improvement(logs, base_extractor, metric_name) without return types