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test_callback.py
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test_callback.py
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# coding: utf-8
import pytest
import lightgbm as lgb
from .utils import SERIALIZERS, pickle_and_unpickle_object
def reset_feature_fraction(boosting_round):
return 0.6 if boosting_round < 15 else 0.8
@pytest.mark.parametrize("serializer", SERIALIZERS)
def test_early_stopping_callback_is_picklable(serializer):
rounds = 5
callback = lgb.early_stopping(stopping_rounds=rounds)
callback_from_disk = pickle_and_unpickle_object(obj=callback, serializer=serializer)
assert callback_from_disk.order == 30
assert callback_from_disk.before_iteration is False
assert callback.stopping_rounds == callback_from_disk.stopping_rounds
assert callback.stopping_rounds == rounds
def test_early_stopping_callback_rejects_invalid_stopping_rounds_with_informative_errors():
with pytest.raises(ValueError, match="stopping_rounds should be an integer and greater than 0. got: 0"):
lgb.early_stopping(stopping_rounds=0)
with pytest.raises(ValueError, match="stopping_rounds should be an integer and greater than 0. got: -1"):
lgb.early_stopping(stopping_rounds=-1)
with pytest.raises(ValueError, match="stopping_rounds should be an integer and greater than 0. got: neverrrr"):
lgb.early_stopping(stopping_rounds="neverrrr")
@pytest.mark.parametrize("serializer", SERIALIZERS)
def test_log_evaluation_callback_is_picklable(serializer):
periods = 42
callback = lgb.log_evaluation(period=periods)
callback_from_disk = pickle_and_unpickle_object(obj=callback, serializer=serializer)
assert callback_from_disk.order == 10
assert callback_from_disk.before_iteration is False
assert callback.period == callback_from_disk.period
assert callback.period == periods
@pytest.mark.parametrize("serializer", SERIALIZERS)
def test_record_evaluation_callback_is_picklable(serializer):
results = {}
callback = lgb.record_evaluation(eval_result=results)
callback_from_disk = pickle_and_unpickle_object(obj=callback, serializer=serializer)
assert callback_from_disk.order == 20
assert callback_from_disk.before_iteration is False
assert callback.eval_result == callback_from_disk.eval_result
assert callback.eval_result is results
@pytest.mark.parametrize("serializer", SERIALIZERS)
def test_reset_parameter_callback_is_picklable(serializer):
params = {"bagging_fraction": [0.7] * 5 + [0.6] * 5, "feature_fraction": reset_feature_fraction}
callback = lgb.reset_parameter(**params)
callback_from_disk = pickle_and_unpickle_object(obj=callback, serializer=serializer)
assert callback_from_disk.order == 10
assert callback_from_disk.before_iteration is True
assert callback.kwargs == callback_from_disk.kwargs
assert callback.kwargs == params