ENH: Compute the number of CV repetitions dynamically

Compute the number of CV repetitions dynamically by setting the number
to the maximum number of folds requested by the user.

scripts/dwi_gp_estimation_error_analysis.py

@@ -47,6 +47,7 @@ def cross_validate(
     X: np.ndarray,
     y: np.ndarray,
     cv: int,
+    n_repeats: int,
     gpr: EddyMotionGPR,
 ) -> dict[int, list[tuple[np.ndarray, np.ndarray, np.ndarray, np.ndarray]]]:
     """
@@ -60,6 +61,8 @@ def cross_validate(
         DWI signal.
     cv : :obj:`int`
         number of folds
+    n_repeats : :obj:`int`
+        Number of times the cross-validator needs to be repeated.
     gpr : obj:`~eddymotion.model._sklearn.EddyMotionGPR`
         The eddymotion Gaussian process regressor object.
 
@@ -70,7 +73,7 @@ def cross_validate(
 
     """
 
-    rkf = RepeatedKFold(n_splits=cv, n_repeats=120 // cv)
+    rkf = RepeatedKFold(n_splits=cv, n_repeats=n_repeats)
     scores = cross_val_score(gpr, X, y, scoring="neg_root_mean_squared_error", cv=rkf)
     return scores
 
@@ -161,7 +164,7 @@ def main() -> None:
     scores = defaultdict(list, {})
     for n in args.kfold:
         for i in range(args.repeats):
-            cv_scores = -1.0 * cross_validate(X, y.T, n, gpr)
+            cv_scores = -1.0 * cross_validate(X, y.T, n, np.max(args.kfold) // n, gpr)
             scores["rmse"] += cv_scores.tolist()
             scores["repeat"] += [i] * len(cv_scores)
             scores["n_folds"] += [n] * len(cv_scores)