Fix some warnings when running tests (#745)

Author: FaustinPulveric

HISTORY.rst

@@ -5,6 +5,7 @@ History
 1.x.x (2025-xx-xx)
 ------------------
 
+* Fix warnings when running tests
 * Fix incorrect URL in PrecisionRecallController docstring
 * Delete redundant risk control notebooks
 * Add link to Thibault Cordier's repository on risk control

mapie/metrics/classification.py

@@ -208,7 +208,7 @@ def classification_ssc(
                     indexes,
                     axis=0
                 )
-            )
+            ).item()
     return coverages
 
 

mapie/tests/test_control_risk.py

@@ -81,7 +81,7 @@ def test_recall_with_zero_sum_is_equal_nan() -> None:
     y_toy = np.zeros((4, 3))
     y_preds_proba = prng.rand(4, 3, 1)
     recall = compute_risk_recall(lambdas, y_preds_proba, y_toy)
-    np.testing.assert_array_equal(recall, np.empty_like(recall))
+    np.testing.assert_array_equal(recall, np.full_like(recall, np.nan))
 
 
 def test_precision_with_zero_sum_is_equal_ones() -> None:

mapie/utils.py

@@ -617,15 +617,6 @@ def _check_alpha_and_n_samples(
         If the number of samples of the score is too low,
         1/alpha (or 1/(1 - alpha)) must be lower than the number of samples.
 
-    Examples
-    --------
-    >>> import numpy as np
-    >>> from mapie.utils import _check_alpha_and_n_samples
-    >>> try:
-    ...     _check_alpha_and_n_samples(np.array([1,2,3]), 0.5)
-    ... except Exception as exception:
-    ...     print(exception)
-    ...
     Number of samples of the score is too low,
     1/confidence_level and 1/(1 - confidence_level) must be
     lower than the number of samples.