Make all data collators accept dict (#6065)

* Make all data collators accept dict

* Style

src/transformers/data/data_collator.py

 from dataclasses import dataclass
-from typing import Any, Callable, Dict, List, NewType, Tuple
+from typing import Any, Callable, Dict, List, NewType, Tuple, Union
 
 import torch
 from torch.nn.utils.rnn import pad_sequence
@@ -77,7 +77,9 @@ class DataCollatorForLanguageModeling:
     mlm: bool = True
     mlm_probability: float = 0.15
 
-    def __call__(self, examples: List[torch.Tensor]) -> Dict[str, torch.Tensor]:
+    def __call__(self, examples: List[Union[torch.Tensor, Dict[str, torch.Tensor]]]) -> Dict[str, torch.Tensor]:
+        if isinstance(examples[0], dict):
+            examples = [e["input_ids"] for e in examples]
         batch = self._tensorize_batch(examples)
         if self.mlm:
             inputs, labels = self.mask_tokens(batch)
@@ -148,7 +150,9 @@ class DataCollatorForPermutationLanguageModeling:
     plm_probability: float = 1 / 6
     max_span_length: int = 5  # maximum length of a span of masked tokens
 
-    def __call__(self, examples: List[torch.Tensor]) -> Dict[str, torch.Tensor]:
+    def __call__(self, examples: List[Union[torch.Tensor, Dict[str, torch.Tensor]]]) -> Dict[str, torch.Tensor]:
+        if isinstance(examples[0], dict):
+            examples = [e["input_ids"] for e in examples]
         batch = self._tensorize_batch(examples)
         inputs, perm_mask, target_mapping, labels = self.mask_tokens(batch)
         return {"input_ids": inputs, "perm_mask": perm_mask, "target_mapping": target_mapping, "labels": labels}