def test_errors(self):
tunables = {
'a_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 2]
}
},
'another_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 2]
}
}
}
def scorer(name, proposal):
if name == 'another_tunable':
raise Exception()
else:
return proposal['a_parameter']
session = BTBSession(tunables, scorer)
best = session.run(4)
assert best['name'] == 'a_tunable'
assert best['config'] == {'a_parameter': 2}
def test_record_score_lt_best(self):
# setup
tuner = MagicMock()
instance = MagicMock(spec_set=BTBSession)
instance._make_id.return_value = 0
instance.proposals = [{'test': 'test'}]
instance._tuners = {'test': tuner}
instance.best_proposal = None
instance._best_normalized = 10
instance._normalize.return_value = 1
instance._normalized_scores = defaultdict(list)
# run
BTBSession.record(instance, 'test', 'config', 1)
# assert
expected_normalized_scores = defaultdict(list)
expected_normalized_scores['test'].append(1)
assert instance.best_proposal is None
assert instance._normalized_scores == expected_normalized_scores
assert instance._best_normalized == 10
tuner.record.assert_called_once_with('config', 1)
def tune(self, X, y, max_evals=10, scoring=None, verbose=False):
""" Tune the pipeline hyper-parameters and select the optimized model.
Args:
X (pandas.DataFrame or ndarray):
Inputs to the pipeline.
y (pandas.Series or ndarray):
Target values.
max_evals (int):
Maximum number of hyper-parameter optimization iterations.
scoring (str):
The name of the scoring function.
verbose (bool):
Whether to log information during processing.
"""
tunables = {'0': self._pipeline.get_tunable_hyperparameters(flat=True)}
session = BTBSession(tunables,
lambda _, hyparam: self.k_fold_validation(
hyparam, X=X, y=y, scoring=scoring),
max_errors=max_evals,
verbose=verbose)
best_proposal = session.run(max_evals)
self._pipeline.set_hyperparameters(best_proposal['config'])
def test_propose_no_tunables(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance._tunables = None
# run
with self.assertRaises(StopTuning):
BTBSession.propose(instance)
def test_propose_tuner_is_none(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance._tuners = {'test_tunable': None}
instance._tunable_names = ['test_tunable']
instance._normalized_scores = None
instance._get_next_tunable_name.return_value = 'test_tunable'
# run
with self.assertRaises(ValueError):
BTBSession.propose(instance)
def test_handle_error_errors_gt_max_errors(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance.errors = Counter()
instance._max_errors = 0
# run
BTBSession.handle_error(instance, 'test')
# assert
instance._remove_tunable.assert_called_once_with('test')
def test_handle_error_errors_gt_max_errors(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance.errors = Counter()
instance._max_errors = 0
# run
BTBSession.handle_error(instance, 'test')
# assert
instance._normalized_scores.pop.assert_called_once_with('test', None)
instance._tunable_names.remove.assert_called_once_with('test')
def test_record_score_is_none(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance._make_id.return_value = 0
instance.proposals = [{'test': 'test'}]
instance.errors = Counter()
instance._max_errors = 5
# run
BTBSession.record(instance, 'test', 'config', None)
# assert
instance.handle_error.assert_called_once_with('test')
def test_normalized_score_becomes_none(self):
"""Tunables that worked at some point but end up removed are not tried again.
After commit ``6a08dc3cf1b68b35630cae6a87783aec4e2c9f83`` the following
scenario has been observed:
- One tunable produces a score at least once and then fails the next trials.
- All the other tunables never produce any score.
- Once all the tuners are created, only the one that produced a score is used.
- After enough errors, this one is discarded, so `_normalized_errors` is empty.
- Since a random.choice is used over the list of tunables, which still contains
the one tha has been discarded, at some point the discarded one is tried again.
This test certifies that this scenario cannot happen again, by validating that
the number of errors is always ``max_errors`` at most.
"""
scores = []
def scorer(name, proposal):
"""Produce a score for the first trial and then fail forever."""
if not scores:
scores.append(1) # boolean variable fails due to scope unles using global
return 1
raise Exception()
tunables = {
'a_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 10]
}
},
'another_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 10]
}
}
}
session = BTBSession(tunables, scorer, max_errors=3)
with pytest.raises(StopTuning):
session.run(8)
assert session.errors == {'a_tunable': 3, 'another_tunable': 3}
def test_stop(self):
tunables = {
'a_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 2]
}
}
}
session = BTBSession(tunables, self.scorer)
with pytest.raises(StopTuning):
session.run()
def test_propose_normalized_scores_gt_tunable_names(self):
# setup
tuner = MagicMock()
tuner.propose.return_value = 'parameters'
instance = MagicMock(spec_set=BTBSession)
instance.proposals = {}
instance._normalized_scores.__len__.return_value = 1
instance._selector.select.return_value = 'test_tunable'
instance._tuners = {'test_tunable': tuner}
instance._tunables = {'test_tunable': 'test_spec'}
instance._tunable_names = ['test_tunable']
instance._make_id.return_value = 1
# run
res_name, res_config = BTBSession.propose(instance)
# assert
assert res_name == 'test_tunable'
assert res_config == 'parameters'
expected_proposals = {
1: {
'id': 1,
'name': 'test_tunable',
'config': 'parameters'
}
}
assert instance.proposals == expected_proposals
instance._make_id.assert_called_once_with('test_tunable', 'parameters')
tuner.propose.assert_called_once_with(1)
def test___init__custom(self):
# setup
selector = MagicMock()
# run
tunable = {'my_test_tuner': {'my_tunable_hp': {}}}
scorer = 'my_scorer'
instance = BTBSession(
tunable,
scorer,
tuner_class='my_tuner',
selector_class=selector,
maximize=False,
max_errors=2,
verbose=True
)
# assert
assert instance._tunables is tunable
assert instance._scorer is scorer
assert instance._tuner_class == 'my_tuner'
assert instance._max_errors == 2
assert instance._best_normalized == np.inf
assert instance._normalized_scores == defaultdict(list)
assert instance._tuners == {}
assert instance._tunable_names == ['my_test_tuner']
assert instance._range is trange
assert instance.best_proposal is None
assert instance.proposals == {}
assert instance.iterations == 0
assert instance.errors == Counter()
def test_allow_duplicates(self):
tunables = {
'a_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 2]
}
}
}
session = BTBSession(tunables, self.scorer, allow_duplicates=True)
best = session.run(10)
assert best['name'] == 'another_tunable'
assert best['config'] == {'a_parameter': 2}
def test__normalize_maximize_true(self):
# setup
instance = MagicMock(spec_set=BTBSession)
# run
result = BTBSession._normalize(instance, 1)
# assert
assert result == 1
def test_minimize(self):
tunables = {
'a_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 2]
}
}
}
session = BTBSession(tunables, self.scorer, maximize=False)
best = session.run(3)
assert best == session.best_proposal
assert best['name'] == 'a_tunable'
assert best['config'] == {'a_parameter': 0}
def test__normalize_maximize_false(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance._maximize = False
# run
result = BTBSession._normalize(instance, 1)
# assert
assert result == -1
def test_propose_raise_error(self):
# setup
tuner = MagicMock()
tuner.propose.side_effect = [StopTuning('test')]
instance = MagicMock(spec_set=BTBSession)
instance._normalized_scores.__len__.return_value = 1
instance._selector.select.return_value = 'test_tunable'
instance._tuners = {'test_tunable': tuner}
instance._tunables = {'test_tunable': 'test_spec'}
instance._tunable_names = ['test_tunable']
instance._make_id.return_value = 1
# run
with self.assertRaises(ValueError):
BTBSession.propose(instance)
def test_record_score_gt_best_tuner_none(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance._make_id.return_value = 0
instance.proposals = [{'test': 'test'}]
instance._tuners = {'test': None}
instance.best_proposal = None
instance._best_normalized = 0
instance._normalize.return_value = 1
instance._normalized_scores = defaultdict(list)
# run
BTBSession.record(instance, 'test', 'config', 1)
# assert
expected_normalized_scores = defaultdict(list)
expected_normalized_scores['test'].append(1)
assert instance._normalized_scores == expected_normalized_scores
assert instance.best_proposal == {'test': 'test', 'score': 1}
assert instance._best_normalized == 1
def test_allow_errors(self):
tunables = {
'a_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 1]
}
}
}
def scorer(name, proposal):
if proposal['a_parameter'] == 0:
raise Exception()
return 1
session = BTBSession(tunables, scorer, max_errors=10)
best = session.run(10)
assert best['name'] == 'a_tunable'
assert best['config'] == {'a_parameter': 1}
def test_multiple(self):
tunables = {
'a_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 2]
}
},
'another_tunable': {
'a_parameter': {
'type': 'int',
'default': 0,
'range': [0, 2]
}
}
}
session = BTBSession(tunables, self.scorer)
best = session.run(6)
assert best['name'] == 'another_tunable'
assert best['config'] == {'a_parameter': 2}
def test_run_score(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance.propose.return_value = ('test', 'config')
instance._scorer.return_value = 1
instance.best_proposal = {'test': 'config'}
instance._range = range
instance.iterations = 0
# run
result = BTBSession.run(instance, 1)
# assert
instance._scorer.assert_called_once_with('test', 'config')
instance.record.assert_called_once_with('test', 'config', 1)
assert result == {'test': 'config'}
assert instance.iterations == 1
def test_run_score_none(self):
# setup
instance = MagicMock(spec_set=BTBSession)
instance.propose.return_value = ('test', {'hp': 'test'})
instance._scorer.side_effect = Exception()
instance.best_proposal = {'test': 'config'}
instance._range = range
instance.iterations = 0
# run
result = BTBSession.run(instance, 1)
# assert
instance._scorer.assert_called_once_with('test', {'hp': 'test'})
instance.record.assert_called_once_with('test', {'hp': 'test'}, None)
assert result == {'test': 'config'}
assert instance.iterations == 1
def test__make_dumpable(self):
# run
randint = np.random.randint(1, dtype=np.integer)
to_dump = {
1: randint,
'str': 'None',
'array': np.array([1, 2, 3]),
}
result = BTBSession._make_dumpable(MagicMock(), to_dump)
# assert
expected_result = {
'1': int(randint),
'str': None,
'array': [1, 2, 3]
}
assert result == expected_result
def test__get_next_tunable_name_normalized_scores(self, mock_np_random_choice):
# setup
mock_np_random_choice.return_value = 'test_name'
selector = MagicMock()
selector.select.return_value = 'test_name'
instance = MagicMock(spec_set=BTBSession)
instance._normalized_scores = [('test_name', 0.1), ('second_test_name', 0.2)]
instance._selector = selector
# run
tunable_name = BTBSession._get_next_tunable_name(instance)
# assert
assert tunable_name == 'test_name'
mock_np_random_choice.assert_not_called()
selector.select.assert_called_once_with([
('test_name', 0.1),
('second_test_name', 0.2),
])
def test__get_next_tunable_name_normalized_scores_none(self, mock_np_random_choice):
# setup
mock_np_random_choice.return_value = 'test_name'
instance = MagicMock(spec_set=BTBSession)
instance._normalized_scores = None
instance._tunables = {
'test_name': 'test',
'second_test_name': 'second_test',
}
# python3.5 randomness issue, we read as in `btb.session`
expected_mock_call = list(instance._tunables.keys())
# run
tunable_name = BTBSession._get_next_tunable_name(instance)
# assert
assert tunable_name == 'test_name'
mock_np_random_choice.assert_called_once_with(expected_mock_call)
def test_propose_normalized_scores_lt_tunable_names(self, mock_tunable, mock_isinstance):
# setup
mock_tunable.from_dict.return_value.get_defaults.return_value = 'defaults'
mock_isinstance.return_value = True
tuner = MagicMock()
instance = MagicMock(spec_set=BTBSession)
instance._tuner_class = tuner
instance.proposals = {}
instance._normalized_scores.__len__.return_value = 0
instance._tunables = {'test_tunable': 'test_spec'}
instance._tunable_names = ['test_tunable']
instance._make_id.return_value = 1
# run
res_name, res_config = BTBSession.propose(instance)
# assert
assert res_name == 'test_tunable'
assert res_config == 'defaults'
expected_proposals = {
1: {
'id': 1,
'name': 'test_tunable',
'config': 'defaults'
}
}
assert instance.proposals == expected_proposals
instance._make_id.assert_called_once_with('test_tunable', 'defaults')
mock_tunable.from_dict.assert_called_once_with('test_spec')
tuner.assert_called_once_with(mock_tunable.from_dict.return_value)
mock_tunable.from_dict.return_value.get_defaults.assert_called_once_with()
expected_isinstance_calls = [call('test_spec', dict), call('defaults', mock_tunable)]
mock_isinstance.has_calls(expected_isinstance_calls)
def test_propose_tunable_cardinality_eq_one(self, mock_tunable, mock_isinstance):
# setup
mock_tunable.from_dict.return_value.cardinality = 1
mock_tunable.from_dict.return_value.get_defaults.return_value = 'parameters'
mock_isinstance.return_value = True
instance = MagicMock(spec_set=BTBSession)
instance._tuners = {}
instance._tunable_names = ['test_tunable']
instance.proposals = {}
instance._make_id.return_value = 1
# run
tunable_name, config = BTBSession.propose(instance)
# assert
instance._make_id.assert_called_once_with('test_tunable', 'parameters')
instance._tuner_class.assert_not_called()
assert instance._tuners == {'test_tunable': None}
assert 'test_tunable' == tunable_name
assert 'parameters' == config
def test___init__default(self):
# run
tunable = {'my_test_tuner': {'my_tunable_hp': {}}}
scorer = 'my_scorer'
instance = BTBSession(tunable, scorer)
# assert
assert instance._tunables is tunable
assert instance._scorer is scorer
assert instance._tuner_class is GPTuner
assert instance._best_normalized == -np.inf
assert instance._normalized_scores == defaultdict(list)
assert instance._tuners == {}
assert instance._tunable_names == ['my_test_tuner']
assert instance._range is range
assert instance._max_errors == 1
assert instance._maximize
assert instance.best_score is None
assert instance.best_proposal is None
assert instance.proposals == {}
assert instance.iterations == 0
assert instance.errors == Counter()
def train_btb(X_train,X_test,y_train,y_test,mtype,common_name_model,problemtype,classes,default_featurenames,transform_model,settings,model_session):
# create file names
model_name=common_name_model+'.pickle'
folder='btb_session'
csvname=common_name_model.split('_')[0]
curdir=os.getcwd()
files=list()
# make a temporary folder for the training session
try:
os.mkdir(folder)
os.chdir(folder)
except:
shutil.rmtree(folder)
os.mkdir(folder)
os.chdir(folder)
# get training and testing data
try:
shutil.copy(curdir+'/'+model_session+'/data/'+csvname+'_train_transformed.csv',os.getcwd()+'/train.csv')
shutil.copy(curdir+'/'+model_session+'/data/'+csvname+'_test_transformed.csv',os.getcwd()+'/test.csv')
except:
shutil.copy(curdir+'/'+model_session+'/data/'+csvname+'_train.csv',os.getcwd()+'/train.csv')
shutil.copy(curdir+'/'+model_session+'/data/'+csvname+'_test.csv',os.getcwd()+'/test.csv')
# create required .JSON
dataset_id, filename=create_json(folder, 'train.csv')
os.mkdir(dataset_id)
os.chdir(dataset_id)
os.mkdir('tables')
shutil.copy(curdir+'/'+folder+'/train.csv', os.getcwd()+'/tables/train.csv')
if mtype=='c':
def build_model(name, hyperparameters):
model_class = models[name]
return model_class(random_state=0, **hyperparameters)
def score_model(name, hyperparameters):
model = build_model(name, hyperparameters)
scores = cross_val_score(model, X_train, y_train)
return scores.mean()
rf_hyperparams = {'n_estimators': IntHyperParam(min=10, max=500),
'max_depth': IntHyperParam(min=10, max=500)}
rf_tunable = Tunable(rf_hyperparams)
print(rf_tunable)
svc_hyperparams = {'C': FloatHyperParam(min=0.01, max=10.0),
'gamma': FloatHyperParam(0.000000001, 0.0000001)}
svc_tunable = Tunable(svc_hyperparams)
print(svc_tunable)
tuners = {'RF': rf_tunable,
'SVC': svc_tunable}
print(tuners)
models = {'RF': RandomForestClassifier,
'SVC': SVC}
selector = UCB1(['RF', 'SVC'])
session = BTBSession(tuners, score_model, verbose=True)
best_proposal = session.run(iterations=100)
best_model = build_model(best_proposal['name'], best_proposal['config'])
best_model.fit(X_train, y_train)
accuracy = best_model.score(X_test, y_test)
# tuner.record(parameters, score)
print('ACCURACY:')
print(accuracy)
# now save the model in .pickle
os.chdir(curdir)
f=open(model_name,'wb')
pickle.dump(best_model, f)
f.close()
elif mtype == 'r':
tunables = {
'random_forest': {
'n_estimators': {'type': 'int', 'default': 2, 'range': [1, 1000]},
'max_features': {'type': 'str', 'default': 'log2', 'range': [None, 'auto', 'log2', 'sqrt']},
'min_samples_split': {'type': 'int', 'default': 2, 'range': [2, 20]},
'min_samples_leaf': {'type': 'int', 'default': 2, 'range': [1, 20]},
},
'extra_trees': {
'n_estimators': {'type': 'int', 'default': 2, 'range': [1, 1000]},
'max_features': {'type': 'str', 'default': 'log2', 'range': [None, 'auto', 'log2', 'sqrt']},
'min_samples_split': {'type': 'int', 'default': 2, 'range': [2, 20]},
'min_samples_leaf': {'type': 'int', 'default': 2, 'range': [1, 20]},
}
}
models = {
'random_forest': RandomForestRegressor,
'extra_trees': ExtraTreesRegressor,
}
def build_model(name, hyperparameters):
model_class = models[name]
return model_class(random_state=0, **hyperparameters)
def score_model(name, hyperparameters):
model = build_model(name, hyperparameters)
r2_scorer = make_scorer(r2_score)
scores = cross_val_score(model, X_train, y_train, scoring=r2_scorer)
return scores.mean()
session = BTBSession(tunables, score_model, verbose=True)
best_proposal = session.run(iterations=100)
best_model = build_model(best_proposal['name'], best_proposal['config'])
best_model.fit(X_train, y_train)
pred = best_model.predict(X_test)
r2_score=r2_score(y_test, pred)
print('R2 score!!')
print(r2_score)
# now save the model in .pickle
os.chdir(curdir)
f=open(model_name,'wb')
pickle.dump(best_model, f)
f.close()
files.append(model_name)
files.append(folder)
model_dir=os.getcwd()
return model_name, model_dir, files
def test_session():
def build_model(name, hyperparameters):
model_class = models[name]
return model_class(random_state=0, **hyperparameters)
def score_model(name, hyperparameters):
model = build_model(name, hyperparameters)
r2_scorer = make_scorer(r2_score)
scores = cross_val_score(model, X_train, y_train, scoring=r2_scorer)
return scores.mean()
dataset = load_dataset()
X_train, X_test, y_train, y_test = train_test_split(dataset.data,
dataset.target,
test_size=0.3,
random_state=0)
tunables = {
'random_forest': {
'n_estimators': {
'type': 'int',
'default': 2,
'range': [1, 1000]
},
'max_features': {
'type': 'str',
'default': 'log2',
'range': [None, 'auto', 'log2', 'sqrt']
},
'min_samples_split': {
'type': 'int',
'default': 2,
'range': [2, 20]
},
'min_samples_leaf': {
'type': 'int',
'default': 2,
'range': [1, 20]
},
},
'extra_trees': {
'n_estimators': {
'type': 'int',
'default': 2,
'range': [1, 1000]
},
'max_features': {
'type': 'str',
'default': 'log2',
'range': [None, 'auto', 'log2', 'sqrt']
},
'min_samples_split': {
'type': 'int',
'default': 2,
'range': [2, 20]
},
'min_samples_leaf': {
'type': 'int',
'default': 2,
'range': [1, 20]
},
}
}
models = {
'random_forest': RandomForestRegressor,
'extra_trees': ExtraTreesRegressor,
}
session = BTBSession(tunables, score_model, verbose=True)
session.run(2)
