[run_lm_finetuning] Tweak fix for non-long tensor, close #2728

see 1ebfeb79

 and #2728
Co-Authored-By: Lysandre Debut <lysandre.debut@reseau.eseo.fr>

examples/run_lm_finetuning.py

@@ -118,7 +118,7 @@ class TextDataset(Dataset):
         return len(self.examples)
 
     def __getitem__(self, item):
-        return torch.tensor(self.examples[item])
+        return torch.tensor(self.examples[item], dtype=torch.long)
 
 
 class LineByLineTextDataset(Dataset):
@@ -138,7 +138,7 @@ class LineByLineTextDataset(Dataset):
         return len(self.examples)
 
     def __getitem__(self, i):
-        return torch.tensor(self.examples[i])
+        return torch.tensor(self.examples[i], dtype=torch.long)
 
 
 def load_and_cache_examples(args, tokenizer, evaluate=False):
@@ -195,7 +195,6 @@ def _rotate_checkpoints(args, checkpoint_prefix="checkpoint", use_mtime=False) -
 
 def mask_tokens(inputs: torch.Tensor, tokenizer: PreTrainedTokenizer, args) -> Tuple[torch.Tensor, torch.Tensor]:
     """ Prepare masked tokens inputs/labels for masked language modeling: 80% MASK, 10% random, 10% original. """
-    inputs = inputs.clone().type(dtype=torch.long)
     labels = inputs.clone()
     # We sample a few tokens in each sequence for masked-LM training (with probability args.mlm_probability defaults to 0.15 in Bert/RoBERTa)
     probability_matrix = torch.full(labels.shape, args.mlm_probability)