def test_standard_scaler_with_std_false_returns_correct_dataframe(
self, numerical: pd.DataFrame):
numerical_scaled = numerical.copy()
numerical_scaled["number_a"] = numerical["number_a"] - 2.5
numerical_scaled["number_b"] = numerical["number_b"] - 6.5
scaler = DFStandardScaler(with_std=False)
result = scaler.fit_transform(numerical)
pd.testing.assert_frame_equal(result, numerical_scaled)
def test_DFStandardScaler_returns_correct_dataframe(numerical):
numerical_scaled = numerical.copy()
numerical_scaled['number_a'] = (numerical['number_a'] -
2.5) / 1.118033988749895
numerical_scaled['number_b'] = (numerical['number_b'] -
6.5) / 1.118033988749895
scaler = DFStandardScaler()
result = scaler.fit_transform(numerical)
pd.testing.assert_frame_equal(result, numerical_scaled)
def test_standard_scaler_returns_correct_dataframe(
self, numerical: pd.DataFrame):
numerical_scaled = numerical.copy()
numerical_scaled["number_a"] = (numerical["number_a"] -
2.5) / 1.118033988749895
numerical_scaled["number_b"] = (numerical["number_b"] -
6.5) / 1.118033988749895
scaler = DFStandardScaler()
result = scaler.fit_transform(numerical)
pd.testing.assert_frame_equal(result, numerical_scaled)
def feature_union_classifier() -> Pipeline:
pipe1 = Pipeline([
("select", Select(["sepal length (cm)", "sepal width (cm)"])),
("scale", DFStandardScaler()),
])
pipe2 = Pipeline([
("select", Select(["petal length (cm)", "petal width (cm)"])),
("scale", DFStandardScaler()),
])
union = DFFeatureUnion(transformer_list=[("pipe1", pipe1), ("pipe2",
pipe2)])
return Pipeline([("features", union),
("estimator", LogisticRegression(solver="liblinear"))])
def test_load_prediction_data_works_as_expected(self):
dataset = load_demo_dataset("iris")
dataset.create_train_test(stratify=True)
feature_pipeline = Pipeline([("scale", DFStandardScaler())])
model = Model(LogisticRegression(), feature_pipeline=feature_pipeline)
model.train_estimator(dataset)
result = model.make_prediction(dataset, 5)
expected = pd.DataFrame({"Prediction": [0]})
pd.testing.assert_frame_equal(result, expected, check_dtype=False)
def test_standard_scaler_works_in_pipeline_with_feature_union(
self, numerical: pd.DataFrame):
numerical_scaled = numerical.copy()
numerical_scaled["number_a"] = (numerical["number_a"] -
2.5) / 1.118033988749895
numerical_scaled["number_b"] = (numerical["number_b"] -
6.5) / 1.118033988749895
union = DFFeatureUnion([("number_a", Select(["number_a"])),
("number_b", Select(["number_b"]))])
pipeline = make_pipeline(union, DFStandardScaler())
result = pipeline.fit_transform(numerical)
pd.testing.assert_frame_equal(result, numerical_scaled)
def test_model_selection_works_with_feature_pipeline(
self, train_iris_dataset: Dataset):
estimators = [
RandomForestClassifier(),
DummyClassifier(strategy="stratified")
]
feature_pipeline = Pipeline([("scale", DFStandardScaler())])
best_estimator, results = Model.test_estimators(
data=train_iris_dataset,
estimators=estimators,
feature_pipeline=feature_pipeline,
)
expected = Pipeline([("features", feature_pipeline),
("estimator", estimators[0])])
assert best_estimator.estimator.get_params() == expected.get_params()
def test_DFStandardScaler_works_in_pipeline_with_DFFeatureUnion(
categorical, numerical):
numerical_scaled = numerical.copy()
numerical_scaled['number_a'] = (numerical['number_a'] -
2.5) / 1.118033988749895
numerical_scaled['number_b'] = (numerical['number_b'] -
6.5) / 1.118033988749895
union = DFFeatureUnion([('number_a', Select(['number_a'])),
('number_b', Select(['number_b']))])
pipeline = make_pipeline(
union,
DFStandardScaler(),
)
result = pipeline.fit_transform(numerical)
pd.testing.assert_frame_equal(result, numerical_scaled)
def test_plots_have_correct_title_when_using_pipeline(
self, dataset: Dataset):
"""
Expect plots to work correctly with pipelines,
showing the title of the estimator and not Pipeline
"""
pipe = Pipeline([
("scale", DFStandardScaler()),
("clf", RandomForestClassifier(n_estimators=10)),
])
model = Model(pipe)
result = model.score_estimator(dataset)
ax = result.plot.permutation_importance()
assert (ax.title.get_text() ==
"Permutation Importances (Accuracy) - RandomForestClassifier")
assert 4 == len(list(ax.get_yticklabels()))
plt.close()
def test_standard_scaler_works_in_gridsearch(self, train_iris_dataset):
grid = create_gridsearch(DFStandardScaler())
model = Model(grid)
result = model.score_estimator(train_iris_dataset)
assert isinstance(result, Result)
def test_standard_scaler_works_in_cv(self, train_iris_dataset):
model = create_model(DFStandardScaler())
result = model.score_estimator(train_iris_dataset, cv=2)
assert isinstance(result, Result)
def test_can_reset_scaler_parameters(self):
scaler = DFStandardScaler()
scaler.scale_ = 0.7
scaler.mean_ = 0.5
scaler._reset()
assert hasattr(scaler, "scale_") is False
def test_works_without_args(self):
assert DFStandardScaler()
def test_missing_data_can_pass_pipeline(self, missing_data: Dataset):
pipeline = Pipeline([("scaler", DFStandardScaler())])
ax = missing_data.plot.missing_data(feature_pipeline=pipeline)
assert [text.get_text() for text in ax.texts] == ["2.0%"]
plt.close()
def pipeline_forest_classifier() -> Pipeline:
pipe = Pipeline([
("scale", DFStandardScaler()),
("estimator", RandomForestClassifier(n_estimators=10)),
])
return pipe
def pipeline_dummy_classifier() -> Pipeline:
pipe = Pipeline([
("scale", DFStandardScaler()),
("estimator", DummyClassifier(strategy="prior")),
])
return pipe