avoid duplicating model on gpu when earlystop is triggered

gfun/vgfs/commons.py

@@ -243,9 +243,12 @@ class Trainer:
                     print(
                         f"- restoring best model from epoch {self.earlystopping.best_epoch} with best metric: {self.earlystopping.best_score:3f}"
                     )
-                    self.model = self.earlystopping.load_model(self.model).to(
-                        self.device
-                    )
+                    restored_model = self.earlystopping.load_model(self.model)
+
+                    # swapping model on gpu
+                    del self.model
+                    self.model = restored_model.to(self.device)
+
                     break
 
             if self.scheduler is not None: