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import importlib from collections import namedtuple import numpy as np import pytest from numpy.testing import assert_array_equal from sklearn._config import config_context, get_config from sklearn.preprocessing import StandardScaler from sklearn.utils._set_output import ( ADAPTERS_MANAGER, ContainerAdapterProtocol, _get_adapter_from_container, _get_output_config, _safe_set_output, _SetOutputMixin, _wrap_data_with_container, check_library_installed, ) from sklearn.utils.fixes import CSR_CONTAINERS def test_pandas_adapter(): """Check pandas adapter has expected behavior.""" pd = pytest.importorskip("pandas") X_np = np.asarray([[1, 0, 3], [0, 0, 1]]) columns = np.asarray(["f0", "f1", "f2"], dtype=object) index = np.asarray([0, 1]) X_df_orig = pd.DataFrame([[1, 2], [1, 3]], index=index) adapter = ADAPTERS_MANAGER.adapters["pandas"] X_container = adapter.create_container(X_np, X_df_orig, columns=lambda: columns) assert isinstance(X_container, pd.DataFrame) assert_array_equal(X_container.columns, columns) assert_array_equal(X_container.index, index) # Input dataframe's index does not change new_columns = np.asarray(["f0", "f1"], dtype=object) X_df = pd.DataFrame([[1, 2], [1, 3]], index=[10, 12]) new_df = adapter.create_container(X_df, X_df_orig, columns=new_columns) assert_array_equal(new_df.columns, new_columns) assert_array_equal(new_df.index, X_df.index) assert adapter.is_supported_container(X_df) assert not adapter.is_supported_container(X_np) # adapter.update_columns updates the columns new_columns = np.array(["a", "c"], dtype=object) new_df = adapter.rename_columns(X_df, new_columns) assert_array_equal(new_df.columns, new_columns) # adapter.hstack stacks the dataframes horizontally. X_df_1 = pd.DataFrame([[1, 2, 5], [3, 4, 6]], columns=["a", "b", "e"]) X_df_2 = pd.DataFrame([[4], [5]], columns=["c"]) X_stacked = adapter.hstack([X_df_1, X_df_2]) expected_df = pd.DataFrame( [[1, 2, 5, 4], [3, 4, 6, 5]], columns=["a", "b", "e", "c"] ) pd.testing.assert_frame_equal(X_stacked, expected_df) # check that we update properly the columns even with duplicate column names # this use-case potentially happen when using ColumnTransformer # non-regression test for gh-28260 X_df = pd.DataFrame([[1, 2], [1, 3]], columns=["a", "a"]) new_columns = np.array(["x__a", "y__a"], dtype=object) new_df = adapter.rename_columns(X_df, new_columns) assert_array_equal(new_df.columns, new_columns) # check the behavior of the inplace parameter in `create_container` # we should trigger a copy X_df = pd.DataFrame([[1, 2], [1, 3]], index=index) X_output = adapter.create_container(X_df, X_df, columns=["a", "b"], inplace=False) assert X_output is not X_df assert list(X_df.columns) == [0, 1] assert list(X_output.columns) == ["a", "b"] # the operation is inplace X_df = pd.DataFrame([[1, 2], [1, 3]], index=index) X_output = adapter.create_container(X_df, X_df, columns=["a", "b"], inplace=True) assert X_output is X_df assert list(X_df.columns) == ["a", "b"] assert list(X_output.columns) == ["a", "b"] def test_polars_adapter(): """Check Polars adapter has expected behavior.""" pl = pytest.importorskip("polars") X_np = np.array([[1, 0, 3], [0, 0, 1]]) columns = ["f1", "f2", "f3"] X_df_orig = pl.DataFrame(X_np, schema=columns, orient="row") adapter = ADAPTERS_MANAGER.adapters["polars"] X_container = adapter.create_container(X_np, X_df_orig, columns=lambda: columns) assert isinstance(X_container, pl.DataFrame) assert_array_equal(X_container.columns, columns) # Update columns with create_container new_columns = np.asarray(["a", "b", "c"], dtype=object) new_df = adapter.create_container(X_df_orig, X_df_orig, columns=new_columns) assert_array_equal(new_df.columns, new_columns) assert adapter.is_supported_container(X_df_orig) assert not adapter.is_supported_container(X_np) # adapter.update_columns updates the columns new_columns = np.array(["a", "c", "g"], dtype=object) new_df = adapter.rename_columns(X_df_orig, new_columns) assert_array_equal(new_df.columns, new_columns) # adapter.hstack stacks the dataframes horizontally. X_df_1 = pl.DataFrame([[1, 2, 5], [3, 4, 6]], schema=["a", "b", "e"], orient="row") X_df_2 = pl.DataFrame([[4], [5]], schema=["c"], orient="row") X_stacked = adapter.hstack([X_df_1, X_df_2]) expected_df = pl.DataFrame( [[1, 2, 5, 4], [3, 4, 6, 5]], schema=["a", "b", "e", "c"], orient="row" ) from polars.testing import assert_frame_equal assert_frame_equal(X_stacked, expected_df) # check the behavior of the inplace parameter in `create_container` # we should trigger a copy X_df = pl.DataFrame([[1, 2], [1, 3]], schema=["a", "b"], orient="row") X_output = adapter.create_container(X_df, X_df, columns=["c", "d"], inplace=False) assert X_output is not X_df assert list(X_df.columns) == ["a", "b"] assert list(X_output.columns) == ["c", "d"] # the operation is inplace X_df = pl.DataFrame([[1, 2], [1, 3]], schema=["a", "b"], orient="row") X_output = adapter.create_container(X_df, X_df, columns=["c", "d"], inplace=True) assert X_output is X_df assert list(X_df.columns) == ["c", "d"] assert list(X_output.columns) == ["c", "d"] @pytest.mark.parametrize("csr_container", CSR_CONTAINERS) def test__container_error_validation(csr_container): """Check errors in _wrap_data_with_container.""" X = np.asarray([[1, 0, 3], [0, 0, 1]]) X_csr = csr_container(X) match = "The transformer outputs a scipy sparse matrix." with config_context(transform_output="pandas"): with pytest.raises(ValueError, match=match): _wrap_data_with_container("transform", X_csr, X, StandardScaler()) class EstimatorWithoutSetOutputAndWithoutTransform: pass class EstimatorNoSetOutputWithTransform: def transform(self, X, y=None): return X # pragma: no cover class EstimatorWithSetOutput(_SetOutputMixin): def fit(self, X, y=None): self.n_features_in_ = X.shape[1] return self def transform(self, X, y=None): return X def get_feature_names_out(self, input_features=None): return np.asarray([f"X{i}" for i in range(self.n_features_in_)], dtype=object) def test__safe_set_output(): """Check _safe_set_output works as expected.""" # Estimator without transform will not raise when setting set_output for transform. est = EstimatorWithoutSetOutputAndWithoutTransform() _safe_set_output(est, transform="pandas") # Estimator with transform but without set_output will raise est = EstimatorNoSetOutputWithTransform() with pytest.raises(ValueError, match="Unable to configure output"): _safe_set_output(est, transform="pandas") est = EstimatorWithSetOutput().fit(np.asarray([[1, 2, 3]])) _safe_set_output(est, transform="pandas") config = _get_output_config("transform", est) assert config["dense"] == "pandas" _safe_set_output(est, transform="default") config = _get_output_config("transform", est) assert config["dense"] == "default" # transform is None is a no-op, so the config remains "default" _safe_set_output(est, transform=None) config = _get_output_config("transform", est) assert config["dense"] == "default" class EstimatorNoSetOutputWithTransformNoFeatureNamesOut(_SetOutputMixin): def transform(self, X, y=None): return X # pragma: no cover def test_set_output_mixin(): """Estimator without get_feature_names_out does not define `set_output`.""" est = EstimatorNoSetOutputWithTransformNoFeatureNamesOut() assert not hasattr(est, "set_output") def test__safe_set_output_error(): """Check transform with invalid config.""" X = np.asarray([[1, 0, 3], [0, 0, 1]]) est = EstimatorWithSetOutput() _safe_set_output(est, transform="bad") msg = "output config must be in" with pytest.raises(ValueError, match=msg): est.transform(X) @pytest.mark.parametrize("dataframe_lib", ["pandas", "polars"]) def test_set_output_method(dataframe_lib): """Check that the output is a dataframe.""" lib = pytest.importorskip(dataframe_lib) X = np.asarray([[1, 0, 3], [0, 0, 1]]) est = EstimatorWithSetOutput().fit(X) # transform=None is a no-op est2 = est.set_output(transform=None) assert est2 is est X_trans_np = est2.transform(X) assert isinstance(X_trans_np, np.ndarray) est.set_output(transform=dataframe_lib) X_trans_pd = est.transform(X) assert isinstance(X_trans_pd, lib.DataFrame) def test_set_output_method_error(): """Check transform fails with invalid transform.""" X = np.asarray([[1, 0, 3], [0, 0, 1]]) est = EstimatorWithSetOutput().fit(X) est.set_output(transform="bad") msg = "output config must be in" with pytest.raises(ValueError, match=msg): est.transform(X) @pytest.mark.parametrize("transform_output", ["pandas", "polars"]) def test__get_output_config(transform_output): """Check _get_output_config works as expected.""" # Without a configuration set, the global config is used global_config = get_config()["transform_output"] config = _get_output_config("transform") assert config["dense"] == global_config with config_context(transform_output=transform_output): # with estimator=None, the global config is used config = _get_output_config("transform") assert config["dense"] == transform_output est = EstimatorNoSetOutputWithTransform() config = _get_output_config("transform", est) assert config["dense"] == transform_output est = EstimatorWithSetOutput() # If estimator has not config, use global config config = _get_output_config("transform", est) assert config["dense"] == transform_output # If estimator has a config, use local config est.set_output(transform="default") config = _get_output_config("transform", est) assert config["dense"] == "default" est.set_output(transform=transform_output) config = _get_output_config("transform", est) assert config["dense"] == transform_output class EstimatorWithSetOutputNoAutoWrap(_SetOutputMixin, auto_wrap_output_keys=None): def transform(self, X, y=None): return X def test_get_output_auto_wrap_false(): """Check that auto_wrap_output_keys=None does not wrap.""" est = EstimatorWithSetOutputNoAutoWrap() assert not hasattr(est, "set_output") X = np.asarray([[1, 0, 3], [0, 0, 1]]) assert X is est.transform(X) def test_auto_wrap_output_keys_errors_with_incorrect_input(): msg = "auto_wrap_output_keys must be None or a tuple of keys." with pytest.raises(ValueError, match=msg): class BadEstimator(_SetOutputMixin, auto_wrap_output_keys="bad_parameter"): pass class AnotherMixin: def __init_subclass__(cls, custom_parameter, kwargs): super().__init_subclass__(kwargs) cls.custom_parameter = custom_parameter def test_set_output_mixin_custom_mixin(): """Check that multiple init_subclasses passes parameters up.""" class BothMixinEstimator(_SetOutputMixin, AnotherMixin, custom_parameter=123): def transform(self, X, y=None): return X def get_feature_names_out(self, input_features=None): return input_features est = BothMixinEstimator() assert est.custom_parameter == 123 assert hasattr(est, "set_output") def test_set_output_mro(): """Check that multi-inheritance resolves to the correct class method. Non-regression test gh-25293. """ class Base(_SetOutputMixin): def transform(self, X): return "Base" # noqa class A(Base): pass class B(Base): def transform(self, X): return "B" class C(A, B): pass assert C().transform(None) == "B" class EstimatorWithSetOutputIndex(_SetOutputMixin): def fit(self, X, y=None): self.n_features_in_ = X.shape[1] return self def transform(self, X, y=None): import pandas as pd # transform by giving output a new index. return pd.DataFrame(X.to_numpy(), index=[f"s{i}" for i in range(X.shape[0])]) def get_feature_names_out(self, input_features=None): return np.asarray([f"X{i}" for i in range(self.n_features_in_)], dtype=object) def test_set_output_pandas_keep_index(): """Check that set_output does not override index. Non-regression test for gh-25730. """ pd = pytest.importorskip("pandas") X = pd.DataFrame([[1, 2, 3], [4, 5, 6]], index=[0, 1]) est = EstimatorWithSetOutputIndex().set_output(transform="pandas") est.fit(X) X_trans = est.transform(X) assert_array_equal(X_trans.index, ["s0", "s1"]) class EstimatorReturnTuple(_SetOutputMixin): def __init__(self, OutputTuple): self.OutputTuple = OutputTuple def transform(self, X, y=None): return self.OutputTuple(X, 2 * X) def test_set_output_named_tuple_out(): """Check that namedtuples are kept by default.""" Output = namedtuple("Output", "X, Y") X = np.asarray([[1, 2, 3]]) est = EstimatorReturnTuple(OutputTuple=Output) X_trans = est.transform(X) assert isinstance(X_trans, Output) assert_array_equal(X_trans.X, X) assert_array_equal(X_trans.Y, 2 * X) class EstimatorWithListInput(_SetOutputMixin): def fit(self, X, y=None): assert isinstance(X, list) self.n_features_in_ = len(X[0]) return self def transform(self, X, y=None): return X def get_feature_names_out(self, input_features=None): return np.asarray([f"X{i}" for i in range(self.n_features_in_)], dtype=object) @pytest.mark.parametrize("dataframe_lib", ["pandas", "polars"]) def test_set_output_list_input(dataframe_lib): """Check set_output for list input. Non-regression test for #27037. """ lib = pytest.importorskip(dataframe_lib) X = [[0, 1, 2, 3], [4, 5, 6, 7]] est = EstimatorWithListInput() est.set_output(transform=dataframe_lib) X_out = est.fit(X).transform(X) assert isinstance(X_out, lib.DataFrame) assert_array_equal(X_out.columns, ["X0", "X1", "X2", "X3"]) @pytest.mark.parametrize("name", sorted(ADAPTERS_MANAGER.adapters)) def test_adapter_class_has_interface(name): """Check adapters have the correct interface.""" assert isinstance(ADAPTERS_MANAGER.adapters[name], ContainerAdapterProtocol) def test_check_library_installed(monkeypatch): """Check import error changed.""" orig_import_module = importlib.import_module def patched_import_module(name): if name == "pandas": raise ImportError() orig_import_module(name, package=None) monkeypatch.setattr(importlib, "import_module", patched_import_module) msg = "Setting output container to 'pandas' requires" with pytest.raises(ImportError, match=msg): check_library_installed("pandas") def test_get_adapter_from_container(): """Check the behavior fo `_get_adapter_from_container`.""" pd = pytest.importorskip("pandas") X = pd.DataFrame({"a": [1, 2, 3], "b": [10, 20, 100]}) adapter = _get_adapter_from_container(X) assert adapter.container_lib == "pandas" err_msg = "The container does not have a registered adapter in scikit-learn." with pytest.raises(ValueError, match=err_msg): _get_adapter_from_container(X.to_numpy())

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