def test_patience(self):
es = early_stopping.EarlyStopping(min_delta=0, patience=0)
patient_es = early_stopping.EarlyStopping(min_delta=0, patience=6)
for step in range(10):
metric = 1.
did_improve, es = es.update(metric)
if es.should_stop:
break
self.assertEqual(step, 1)
for patient_step in range(10):
metric = 1.
did_improve, patient_es = patient_es.update(metric)
if patient_es.should_stop:
break
self.assertEqual(patient_step, 7)
def test_delta(self):
es = early_stopping.EarlyStopping(min_delta=0,
patience=0)
delta_es = early_stopping.EarlyStopping(min_delta=1e-3,
patience=0)
delta_patient_es = early_stopping.EarlyStopping(min_delta=1e-3,
patience=1)
metric = 1.
for step in range(100):
metric -= 1e-4
did_improve, es = es.update(metric)
if es.should_stop:
break
self.assertEqual(step, 99)
metric = 1.
for step in range(100):
metric -= 1e-4
did_improve, delta_es = delta_es.update(metric)
if delta_es.should_stop:
break
self.assertEqual(step, 1)
metrics = [0.01, 0.005, 0.0033, 0.0025, 0.002,
0.0017, 0.0014, 0.0012, 0.0011, 0.001]
improvement_steps = 0
for step in range(10):
metric = metrics[step]
did_improve, delta_patient_es = delta_patient_es.update(metric)
if did_improve:
improvement_steps += 1
if delta_patient_es.should_stop:
break
self.assertEqual(improvement_steps, 4) # steps 0, 1, 2, 4
self.assertEqual(step, 6)
def test_update(self):
es = early_stopping.EarlyStopping(min_delta=0, patience=0)
for i in range(2):
improve_steps = 0
for step in range(10):
metric = 1.
did_improve, es = es.update(metric)
if not did_improve:
improve_steps += 1
if es.should_stop:
break
self.assertEqual(improve_steps, 1)
self.assertEqual(step, 1)
es = es.reset() # ensure object is reusable if reset.