add max padding

iwslt2011.py

@@ -262,7 +262,15 @@ class IWSLT11(datasets.GeneratorBasedBuilder):
                 )
             ids = apply_window(np.arange(len(tokens)))
             tokens = apply_window(tokens)
-            tokens = self.config.tokenizer([t.tolist() for t in tokens], is_split_into_words=True, return_offsets_mapping=True, padding=True, truncation=True)
+            tokens = self.config.tokenizer(
+                [t.tolist() for t in tokens],
+                is_split_into_words=True,
+                return_offsets_mapping=True,
+                padding=True,
+                truncation=True,
+                max_length=int(self.config.task.window_size*2),
+                pad_to_multiple_of=int(self.config.task.window_size*2)
+            )
             labels = apply_window(labels)
             for i, (ids, labels) in enumerate(zip(ids, labels)):
                 if self.config.tokenizer is None: