fix tests errors

Author: allglc

mapie/risk_control/multi_label_classification.py

@@ -372,7 +372,7 @@ def _check_compute_risks_first_call(self) -> bool:
         bool
             True if it is the first time, else False.
         """
-        return not hasattr(self, "risks")
+        return not hasattr(self, "_risks")
 
     def _check_bound(self, bound: Optional[str]):
         """
@@ -496,10 +496,10 @@ def compute_best_predict_param(self) -> MultiLabelClassificationController:
             self.n_obs = len(self._risks)
             self.r_hat = self._risks.mean(axis=0)
             self.valid_index, _ = ltt_procedure(
-                self.r_hat,
-                np.tile(self._alpha, (self.r_hat.shape[0], 1)),
+                np.expand_dims(self.r_hat, axis=0),
+                np.expand_dims(self._alpha, axis=0),
                 cast(float, self._delta),
-                np.full_like(self.r_hat, self.n_obs),
+                np.expand_dims(np.array([self.n_obs]), axis=0),
             )
             self.valid_predict_params = []
             for index_list in self.valid_index:

mapie/tests/risk_control/test_precision_recall_control.py

@@ -485,7 +485,7 @@ def test_reinit_new_fit():
     )
     mapie_clf.calibrate(X_toy, y_toy)
     mapie_clf.calibrate(X_toy, y_toy)
-    assert len(mapie_clf.risks) == len(X_toy)
+    assert len(mapie_clf._risks) == len(X_toy)
 
 
 @pytest.mark.parametrize("method", WRONG_METHODS)
@@ -534,9 +534,7 @@ def test_bound_error(bound: str) -> None:
 @pytest.mark.parametrize("metric_control", WRONG_METRICS)
 def test_metric_error_in_init(metric_control: str) -> None:
     """Test error for wrong metrics"""
-    with pytest.raises(
-        ValueError, match=r".*When risk is provided as a string, it must be one of:.*"
-    ):
+    with pytest.raises(ValueError, match=r".*risk must be one of:*"):
         MultiLabelClassificationController(
             predict_function=toy_predict_function,
             random_state=random_state,