FIX: add warnings and better indent

mapie/regression/time_series_regression.py

@@ -2,6 +2,8 @@
 
 from typing import Iterable, Optional, Tuple, Union, cast
 
+import warnings
+
 import numpy as np
 from sklearn.base import RegressorMixin
 from sklearn.model_selection import BaseCrossValidator
@@ -159,12 +161,12 @@ def partial_fit(
             the length of the training set.
         """
         warnings.warn(
-                "WARNING: Deprecated method. "
-                + "The method \"partial_fit\" is outdated. "
-                + "Prefer to use \"update\" instead to keep "
-                + "the same behavior in the future.",
-                DeprecationWarning
-            )
+            "WARNING: Deprecated method. "
+            + "The method \"partial_fit\" is outdated. "
+            + "Prefer to use \"update\" instead to keep "
+            + "the same behavior in the future.",
+            DeprecationWarning
+        )
         check_is_fitted(self, self.fit_attributes)
         X, y = cast(NDArray, X), cast(NDArray, y)
         m, n = len(X), len(self.conformity_scores_)