fix hasattr check for task-awareness

Author: AntonioCarta

avalanche/training/templates/base_sgd.py

@@ -456,9 +456,7 @@ def make_train_dataloader(
             other_dataloader_args["ffcv_args"] = kwargs["ffcv_args"]
 
         # use task-balanced dataloader for task-aware benchmarks
-        if hasattr(self.experience, "task_label") or hasattr(
-            self.experience, "task_labels"
-        ):
+        if hasattr(self.experience, "task_labels"):
             self.dataloader = TaskBalancedDataLoader(
                 self.adapted_dataset,
                 oversample_small_groups=True,

avalanche/training/templates/problem_type/supervised_problem.py

@@ -45,9 +45,7 @@ def criterion(self):
     def forward(self):
         """Compute the model's output given the current mini-batch."""
         # use task-aware forward only for task-aware benchmarks
-        if hasattr(self.experience, "task_labels") or hasattr(
-            self.experience, "task_label"
-        ):
+        if hasattr(self.experience, "task_labels"):
             return avalanche_forward(self.model, self.mb_x, self.mb_task_id)
         else:
             return self.model(self.mb_x)