#625 fix even even more pre-commit errors

src/imitation/algorithms/preference_comparisons.py

@@ -85,6 +85,9 @@ def has_pretraining(self) -> bool:
 
         By default, True is returned if the unsupervised_pretrain() method is not
         overriden, bud subclasses may choose to override this behavior.
+
+        Returns:
+            True if this generator has a pre-training phase, False otherwise
         """
         orig_impl = TrajectoryGenerator.unsupervised_pretrain
         return type(self).unsupervised_pretrain != orig_impl
@@ -105,7 +108,7 @@ def unsupervised_pretrain(self, steps: int, **kwargs: Any) -> None:
                 f"{steps} timesteps allocated for unsupervised pre-training:"
                 " Trajectory generators without pre-training implementation should"
                 " not consume any timesteps (otherwise the total number of"
-                " timesteps executed may be misleading)"
+                " timesteps executed may be misleading)",
             )
 
     def train(self, steps: int, **kwargs: Any) -> None: