def test_feature_init_invalid_transformer_api(inputs):
input, transformer = inputs
with pytest.raises(ValueError):
Feature(input, object())
with pytest.raises(ValueError):
Feature(input, IdentityTransformer)
def test_discover(sample_data, expensive_stats):
features = [
Feature('size',
NullFiller(0),
source='foo.features.contrib.user_a.feature_1'),
Feature('strength',
NullFiller(100),
source='foo.features.contrib.user_b.feature_1')
]
X_df, y_df = sample_data.X, sample_data.y
y = np.asfarray(y_df)
df = discover(features, X_df, y_df, y, expensive_stats=expensive_stats)
expected_cols = {
'name',
'description',
'input',
'transformer',
'primitives',
'output',
'author',
'source',
'mutual_information',
'conditional_mutual_information',
'ninputs',
'nvalues',
'ncontinuous',
'ndiscrete',
'mean',
'std',
'variance',
'min',
'median',
'max',
'nunique',
}
actual_cols = df.columns
assert not expected_cols.symmetric_difference(actual_cols)
assert df.shape[0] == len(features)
# test filter
input = 'size'
discovery_df = discover(features, X_df, y_df, y, input=input)
assert discovery_df.shape[0] == len([
feature for feature in features
if feature.input == input or input in feature.input
])
# test no data available
# have to clear cache, as values on data already known
ballet.discovery._summarize_feature.memory.clear()
discovery_df = discover(features, None, None, None)
assert discovery_df.shape[0] == len(features)
actual_cols = discovery_df.columns
assert not expected_cols.symmetric_difference(actual_cols)
assert np.isnan(discovery_df['mean'].at[0])
def test_init(self):
feature_1 = Feature(input='A_0',
transformer=IdentityTransformer(),
source='1st Feature')
feature_2 = Feature(input='Z_0',
transformer=IdentityTransformer(),
source='2nd Feature')
features = [feature_1]
candidate_feature = feature_2
accepter = GFSSFAccepter(self.X, self.y, features, candidate_feature)
self.assertIsNotNone(accepter)
def test_can_deepcopy():
# see GH 90
feature = Feature('size', IdentityTransformer())
pipeline = FeatureEngineeringPipeline(feature)
assert hasattr(pipeline, '_ballet_features')
pipeline2 = deepcopy(pipeline)
assert hasattr(pipeline2, '_ballet_features')
def test_producing_missing_values_fails(self):
assert has_nans(self.X)
feature = Feature(input='size', transformer=IdentityTransformer())
valid, failures = check_from_class(FeatureApiCheck, feature, self.X,
self.y)
self.assertFalse(valid)
self.assertIn(NoMissingValuesCheck.__name__, failures)
def test_feature_pipeline(inputs):
input, transformer = inputs
feature = Feature(input, transformer)
pipeline = feature.pipeline
assert isinstance(pipeline, FeatureEngineeringPipeline)
pipeline2 = feature.pipeline
assert pipeline is pipeline2
def test_transform(input, transformer):
feature = Feature(input, transformer)
mapper = FeatureEngineeringPipeline(feature)
df = pd.util.testing.makeCustomDataframe(5, 2)
df.columns = ['foo', 'bar']
mapper.fit(df)
X = mapper.transform(df)
assert np.shape(X) == (5, 2)
def test_transform(self):
feature = Feature(self.input, self.transformer)
mapper = FeatureEngineeringPipeline(feature)
df = pd.util.testing.makeCustomDataframe(5, 2)
df.columns = ['foo', 'bar']
mapper.fit(df)
X = mapper.transform(df)
self.assertEqual(np.shape(X), (5, 1))
def test_gfssf_pruner_keep_relevant(sample_data):
X_df, y_df, y = sample_data
feature_1 = Feature(
input='A_0',
transformer=IdentityTransformer(),
source='1st Feature')
feature_2 = Feature(
input='Z_0',
transformer=IdentityTransformer(),
source='2nd Feature')
gfssf_pruner = GFSSFPruner(
X_df, y_df, X_df, y, [feature_1], feature_2)
redunant_features = gfssf_pruner.prune()
assert feature_1 not in redunant_features, \
'Still relevant features should be pruned'
def test_gfssf_pruner_prune_exact_replicas(sample_data):
X_df, y_df, y = sample_data
feature_1 = Feature(
input='A_0',
transformer=IdentityTransformer(),
source='1st Feature')
feature_2 = Feature(
input='A_0',
transformer=IdentityTransformer(),
source='2nd Feature')
gfssf_pruner = GFSSFPruner(
X_df, y_df, X_df, y, [feature_1], feature_2)
redunant_features = gfssf_pruner.prune()
assert feature_1 in redunant_features, \
'Exact replica features should be pruned'
def test_bad_feature_transform_errors(self):
# transformer throws errors
feature = Feature(input='size',
transformer=FragileTransformer((lambda x: True, ),
(RuntimeError, )))
valid, failures = check_from_class(FeatureApiCheck, feature, self.X,
self.y)
self.assertFalse(valid)
self.assertIn(CanTransformCheck.__name__, failures)
def test_mutual_information_accepter_nans(handle_nan_targets, expected):
X_df = pd.DataFrame({'A': [1, 2, 3]})
y = np.array([np.nan, 2, 3]).reshape(-1, 1)
feature = Feature(
input='A',
transformer=IdentityTransformer())
accepter = MutualInformationAccepter(
X_df, y, X_df, y, [], feature, handle_nan_targets=handle_nan_targets)
actual = accepter.judge()
assert expected == actual
def test_gfssf_accepter_init(sample_data):
X_df, y_df, y = sample_data
feature_1 = Feature(
input='A_0',
transformer=IdentityTransformer(),
source='1st Feature')
feature_2 = Feature(
input='Z_0',
transformer=IdentityTransformer(),
source='2nd Feature')
features = [feature_1]
candidate_feature = feature_2
accepter = GFSSFAccepter(
X_df, y_df, X_df, y, features, candidate_feature)
assert accepter is not None
def test_bad_feature_input(sample_data):
# bad input
feature = Feature(
input=3,
transformer=SimpleImputer(),
)
valid, failures, advice = check_from_class(
FeatureApiCheck, feature, sample_data.X, sample_data.y)
assert not valid
assert HasCorrectInputTypeCheck.__name__ in failures
def test_good_feature(sample_data):
feature = Feature(
input='size',
transformer=SimpleImputer(),
)
valid, failures, advice = check_from_class(
FeatureApiCheck, feature, sample_data.X, sample_data.y)
assert valid
assert len(failures) == 0
def test_good_feature(self):
feature = Feature(
input='size',
transformer=SimpleImputer(),
)
valid, failures = check_from_class(
FeatureApiCheck, feature, self.X, self.y)
self.assertTrue(valid)
self.assertEqual(len(failures), 0)
def test_producing_missing_values_fails(sample_data):
assert has_nans(sample_data.X)
feature = Feature(
input='size',
transformer=IdentityTransformer()
)
valid, failures, advice = check_from_class(
FeatureApiCheck, feature, sample_data.X, sample_data.y)
assert not valid
assert NoMissingValuesCheck.__name__ in failures
def test_bad_feature_input(self):
# bad input
feature = Feature(
input=3,
transformer=SimpleImputer(),
)
valid, failures = check_from_class(
FeatureApiCheck, feature, self.X, self.y)
self.assertFalse(valid)
self.assertIn(HasCorrectInputTypeCheck.__name__, failures)
def test_bad_feature_transform_errors(sample_data):
# transformer throws errors
feature = Feature(
input='size',
transformer=FragileTransformer(
(lambda x: True, ), (RuntimeError, ))
)
valid, failures, advice = check_from_class(
FeatureApiCheck, feature, sample_data.X, sample_data.y)
assert not valid
assert CanTransformCheck.__name__ in failures
def test_discover_feature_error(sample_data):
features = [
Feature('size', FragileTransformer()),
]
X_df, y_df = sample_data.X, sample_data.y
y = np.asfarray(y_df)
discovery_df = discover(features, X_df, y_df, y)
assert discovery_df.shape[0] == len(features)
assert np.isnan(discovery_df['mean'].at[0])
def test_robust_transformer_desugar():
"""Should be able to "desugar" multiple things into a valid transformer pipeline""" # noqa
transformer = [
None,
IdentityTransformer(),
lambda x: x,
Feature('A', IdentityTransformer()),
('A', IdentityTransformer()),
('A', [None, IdentityTransformer()]),
]
robust_transformer = make_robust_transformer(transformer)
assert isinstance(robust_transformer, TransformerPipeline)
def test_df_colnames(input, transformer, output):
feature = Feature(input, transformer, output=output)
mapper = FeatureEngineeringPipeline(feature)
entities_df = pd.util.testing.makeCustomDataframe(5, 2)
entities_df.columns = ['foo', 'bar']
feature_matrix = mapper.fit_transform(entities_df)
feature_frame = pd.DataFrame(
feature_matrix,
columns=mapper.transformed_names_,
index=entities_df.index,
)
assert fy.all(fy.isa(str), feature_frame.columns)
def test_variance_threshold_accepter(mock_var, sample_data):
expected = False
X_df, y_df, y = sample_data
feature = Feature(
input='A_0',
transformer=IdentityTransformer(),
source='1st Feature')
accepter = VarianceThresholdAccepter(
X_df, y_df, X_df, y, [], feature)
actual = accepter.judge()
assert expected == actual
def test_bad_feature_deepcopy_fails(self):
class _CopyFailsTransformer(IdentityTransformer):
def __deepcopy__(self, memo):
raise RuntimeError
feature = Feature(
input='size',
transformer=_CopyFailsTransformer(),
)
valid, failures = check_from_class(
FeatureApiCheck, feature, self.X, self.y)
self.assertFalse(valid)
self.assertIn(CanDeepcopyCheck.__name__, failures)
def test_bad_feature_deepcopy_fails(sample_data):
class _CopyFailsTransformer(IdentityTransformer):
def __deepcopy__(self, memo):
raise RuntimeError
feature = Feature(
input='size',
transformer=_CopyFailsTransformer(),
)
valid, failures, advice = check_from_class(
FeatureApiCheck, feature, sample_data.X, sample_data.y)
assert not valid
assert CanDeepcopyCheck.__name__ in failures
def test_mutual_information_accepter(_, sample_data):
expected = True
X_df, y_df, y = sample_data
feature = Feature(
input='A_0',
transformer=IdentityTransformer(),
source='1st Feature')
accepter = MutualInformationAccepter(
X_df, y_df, X_df, y, [], feature)
actual = accepter.judge()
assert expected == actual
def test_gfssf_pruner_prune_weak_replicas(sample_data):
X_df, y_df, y = sample_data
def add_noise(X):
X = asarray2d(X)
return X + np.random.normal(0, 0.5, X.shape)
noise_transformer = SimpleFunctionTransformer(add_noise)
feature_weak = Feature(
input='A_0',
transformer=noise_transformer,
source='1st Feature')
feature_strong = Feature(
input='A_0',
transformer=IdentityTransformer(),
source='2nd Feature')
gfssf_pruner = GFSSFPruner(
X_df, y_df, X_df, y, [feature_weak], feature_strong)
redunant_features = gfssf_pruner.prune()
assert feature_weak in redunant_features, \
'Noisy features should be pruned'
def test_discover_target_nans(sample_data):
features = [
Feature('size', NullFiller(0)),
]
X_df, y_df = sample_data.X, sample_data.y
y = np.asfarray(y_df)
# introduce nan to target
y[0] = np.nan
discovery_df = discover(features, X_df, y_df, y)
# stats with target should still be computed
assert not np.isnan(discovery_df['mutual_information']).any()
def test_variance_threshold_accepter_feature_group():
expected = True
# variance is 0.25 per column, > 0.05 threshold
X = pd.DataFrame(np.eye(2))
y = None
feature = Feature(
input=[0, 1],
transformer=IdentityTransformer(),
source='1st Feature')
accepter = VarianceThresholdAccepter(
X, y, X, y, [], feature)
actual = accepter.judge()
assert expected == actual
def test_bad_feature_wrong_transform_length(sample_data):
class _WrongLengthTransformer(BaseTransformer):
def transform(self, X, **transform_kwargs):
new_shape = list(X.shape)
new_shape[0] += 1
output = np.arange(np.prod(new_shape)).reshape(new_shape)
return output
# doesn't return correct length
feature = Feature(
input='size',
transformer=_WrongLengthTransformer(),
)
valid, failures, advice = check_from_class(
FeatureApiCheck, feature, sample_data.X, sample_data.y)
assert not valid
assert HasCorrectOutputDimensionsCheck.__name__ in failures