fix some tests

.gitignore

@@ -11,3 +11,4 @@ build/
 dist/
 docs/src/examples
 sg_execution_times.rst
+.coverage*

pyproject.toml

@@ -75,9 +75,6 @@ include = [
 [tool.coverage.xml]
 output = 'tests/coverage.xml'
 
-[tool.pytest.ini_options]
-testpaths = "tests"
-
 [tool.isort]
 skip = "__init__.py"
 profile = "black"

src/skmatter/_selection.py

@@ -561,17 +561,15 @@ def score(self, X, y=None):
 
         Parameters
         ----------
-        X : numpy.ndarray of shape [n_samples, n_features]
-            The input samples.
+        X : ignored
         y : ignored
 
         Returns
         -------
         score : numpy.ndarray of (n_to_select_from_)
             :math:`\pi` importance for the given samples or features
         """
-        X, y = validate_data(self, X, y, reset=False)
-
+        validate_data(self, X, y, reset=False)  # present for API consistency
         return self.pi_
 
     def _init_greedy_search(self, X, y, n_to_select):
@@ -746,8 +744,7 @@ def score(self, X, y=None):
         score : numpy.ndarray of (n_to_select_from_)
             :math:`\pi` importance for the given samples or features
         """
-        X, y = validate_data(self, X, y, reset=False)
-
+        validate_data(self, X, y, reset=False)  # present for API consistency
         return self.pi_
 
     def _init_greedy_search(self, X, y, n_to_select):
@@ -941,8 +938,7 @@ def score(self, X, y=None):
         -------
         hausdorff : Hausdorff distances
         """
-        X, y = validate_data(self, X, y, reset=False)
-
+        validate_data(self, X, y, reset=False)
         return self.hausdorff_
 
     def get_distance(self):
@@ -1079,15 +1075,16 @@ def __init__(
         )
 
     def fit(self, X, y=None, warm_start=False):
-
         if self.mixing == 1.0:
             raise ValueError(
-                "Mixing = 1.0 corresponds to traditional FPS."
-                "Please use the FPS class."
+                "Mixing = 1.0 corresponds to traditional FPS. Please use the FPS class."
             )
 
         return super().fit(X, y)
 
+    # docstring is inherited and set from the base class
+    fit.__doc__ = GreedySelector.fit.__doc__
+
     def score(self, X, y=None):
         """Returns the Hausdorff distances of all samples to previous selections.
 
@@ -1104,8 +1101,7 @@ def score(self, X, y=None):
         -------
         hausdorff : Hausdorff distances
         """
-        X, y = validate_data(self, X, y, reset=False)
-
+        validate_data(self, X, y, reset=False)
         return self.hausdorff_
 
     def get_distance(self):

src/skmatter/utils/_pcovr_utils.py

@@ -9,18 +9,30 @@
 
 
 def check_lr_fit(regressor, X, y):
-    r"""
+    """
     Checks that a (linear) regressor is fitted, and if not,
-    fits it with the provided data
-
-    :param regressor: sklearn-style regressor
-    :type regressor: object
-    :param X: feature matrix with which to fit the regressor
-        if it is not already fitted
-    :type X: array
-    :param y: target values with which to fit the regressor
-        if it is not already fitted
-    :type y: array
+    fits it with the provided data.
+
+    Parameters
+    ----------
+    regressor : object
+        sklearn-style regressor
+    X : array-like
+        Feature matrix with which to fit the regressor if it is not already fitted
+    y : array-like
+        Target values with which to fit the regressor if it is not already fitted
+
+    Returns
+    -------
+    fitted_regressor : object
+        The fitted regressor. If input regressor was already fitted and compatible with
+        the data, returns a deep copy. Otherwise returns a newly fitted regressor.
+
+    Raises
+    ------
+    ValueError
+        If the fitted regressor's coefficients dimensions are incompatible with the
+        target space.
     """
     try:
         check_is_fitted(regressor)
@@ -32,18 +44,18 @@ def check_lr_fit(regressor, X, y):
         # Check compatibility with y
         if fitted_regressor.coef_.ndim != y.ndim:
             raise ValueError(
-                "The regressor coefficients have a dimension incompatible "
-                "with the supplied target space. "
-                "The coefficients have dimension %d and the targets "
-                "have dimension %d" % (fitted_regressor.coef_.ndim, y.ndim)
+                "The regressor coefficients have a dimension incompatible with the "
+                "supplied target space. The coefficients have dimension "
+                f"{fitted_regressor.coef_.ndim} and the targets have dimension "
+                f"{y.ndim}"
             )
         elif y.ndim == 2:
             if fitted_regressor.coef_.shape[0] != y.shape[1]:
                 raise ValueError(
-                    "The regressor coefficients have a shape incompatible "
-                    "with the supplied target space. "
-                    "The coefficients have shape %r and the targets "
-                    "have shape %r" % (fitted_regressor.coef_.shape, y.shape)
+                    "The regressor coefficients have a shape incompatible with the "
+                    "supplied target space. The coefficients have shape "
+                    f"{fitted_regressor.coef_.shape} and the targets have shape "
+                    f"{y.shape}"
                 )
 
     except NotFittedError:
@@ -54,20 +66,37 @@ def check_lr_fit(regressor, X, y):
 
 
 def check_krr_fit(regressor, K, X, y):
-    r"""
+    """
     Checks that a (kernel ridge) regressor is fitted, and if not,
-    fits it with the provided data
-
-    :param regressor: sklearn-style regressor
-    :type regressor: object
-    :param K: kernel matrix with which to fit the regressor
-        if it is not already fitted
-    :type K: array
-    :param X: feature matrix with which to check the regressor
-    :type X: array
-    :param y: target values with which to fit the regressor
-        if it is not already fitted
-    :type y: array
+    fits it with the provided data.
+
+    Parameters
+    ----------
+    regressor : object
+        sklearn-style regressor
+    K : array-like
+        Kernel matrix with which to fit the regressor if it is not already fitted
+    X : array-like
+        Feature matrix with which to check the regressor
+    y : array-like
+        Target values with which to fit the regressor if it is not already fitted
+
+    Returns
+    -------
+    fitted_regressor : object
+        The fitted regressor. If input regressor was already fitted and compatible with
+        the data, returns a deep copy. Otherwise returns a newly fitted regressor.
+
+    Raises
+    ------
+    ValueError
+        If the fitted regressor's coefficients dimensions are incompatible with the
+        target space.
+
+    Notes
+    -----
+    For unfitted regressors, sets the kernel to "precomputed" before fitting with the
+    provided kernel matrix K to avoid recomputation.
     """
     try:
         check_is_fitted(regressor)
@@ -79,18 +108,18 @@ def check_krr_fit(regressor, K, X, y):
         # Check compatibility with y
         if fitted_regressor.dual_coef_.ndim != y.ndim:
             raise ValueError(
-                "The regressor coefficients have a dimension incompatible "
-                "with the supplied target space. "
-                "The coefficients have dimension %d and the targets "
-                "have dimension %d" % (fitted_regressor.dual_coef_.ndim, y.ndim)
+                "The regressor coefficients have a dimension incompatible with the "
+                "supplied target space. The coefficients have dimension "
+                f"{fitted_regressor.dual_coef_.ndim} and the targets have dimension "
+                f"{y.ndim}"
             )
         elif y.ndim == 2:
             if fitted_regressor.dual_coef_.shape[1] != y.shape[1]:
                 raise ValueError(
-                    "The regressor coefficients have a shape incompatible "
-                    "with the supplied target space. "
-                    "The coefficients have shape %r and the targets "
-                    "have shape %r" % (fitted_regressor.dual_coef_.shape, y.shape)
+                    "The regressor coefficients have a shape incompatible with the "
+                    "supplied target space. The coefficients have shape "
+                    f"{fitted_regressor.dual_coef_.shape} and the targets have shape "
+                    f"{y.shape}"
                 )
 
     except NotFittedError:

tests/test_feature_pcov_fps.py

@@ -24,11 +24,12 @@ def test_restart(self):
 
     def test_no_mixing_1(self):
         """Check that the model throws an error when mixing = 1.0."""
+        selector = PCovFPS(n_to_select=1, mixing=1.0)
         with self.assertRaises(ValueError) as cm:
-            _ = PCovFPS(n_to_select=1, mixing=1.0)
+            selector.fit(self.X, y=self.y)
         self.assertEqual(
             str(cm.exception),
-            "Mixing = 1.0 corresponds to traditional FPS." "Please use the FPS class.",
+            "Mixing = 1.0 corresponds to traditional FPS. Please use the FPS class.",
         )
 
 

tests/test_kernel_pcovr.py

@@ -255,7 +255,7 @@ def test_incompatible_coef_shape(self):
 
         # Dimension mismatch
         with self.assertRaises(ValueError) as cm:
-            kpcovr.fit(self.X, self.Y[:, 0])
+            kpcovr.fit(self.X, np.zeros(self.Y.shape[0] + (2,)))
         self.assertTrue(
             str(cm.exception),
             "The regressor coefficients have a dimension incompatible "

tests/test_pcovr.py

@@ -491,13 +491,12 @@ def test_incompatible_coef_shape(self):
 
         # Dimension mismatch
         with self.assertRaises(ValueError) as cm:
-            pcovr.fit(self.X, self.Y.squeeze())
+            pcovr.fit(self.X, np.zeros((self.Y.shape[0], 2)))
         self.assertEqual(
             str(cm.exception),
-            "The regressor coefficients have a dimension incompatible "
-            "with the supplied target space. "
-            "The coefficients have dimension %d and the targets "
-            "have dimension %d" % (regressor.coef_.ndim, self.Y.squeeze().ndim),
+            "The regressor coefficients have a dimension incompatible with the "
+            "supplied target space. The coefficients have dimension 1 and the targets "
+            "have dimension 2",
         )
 
         # Shape mismatch (number of targets)

tests/test_sample_pcov_fps.py

@@ -24,11 +24,12 @@ def test_restart(self):
 
     def test_no_mixing_1(self):
         """Check that the model throws an error when mixing = 1.0."""
+        selector = PCovFPS(n_to_select=1, mixing=1.0)
         with self.assertRaises(ValueError) as cm:
-            _ = PCovFPS(n_to_select=1, mixing=1.0)
+            selector.fit(self.X, y=self.y)
         self.assertEqual(
             str(cm.exception),
-            "Mixing = 1.0 corresponds to traditional FPS." "Please use the FPS class.",
+            "Mixing = 1.0 corresponds to traditional FPS. Please use the FPS class.",
         )