Running Roberta on Race Multi choice dataset giving error 
I am trying to use the script provided for race dataset training using bert/roberta models. I am running the script and getting this error :


```
python3 run_multiple_choice.py --task_name race --model_name_or_path roberta-base--do_train --do_eval --data_dir $SWAG_DIR --learning_rate 5e-5 --num_train_epochs 3 --max_seq_length 80 --output_dir models_bert/swag_base --per_gpu_eval_batch_size=16 --per_device_train_batch_size=16 --gradient_accumulation_steps 2 --overwrite_output
/home/admin/Monk/lib/python3.6/site-packages/transformers/training_args.py:332: FutureWarning: The `evaluate_during_training` argument is deprecated in favor of `evaluation_strategy` (which has more options)
  FutureWarning,
11/19/2020 12:22:36 - WARNING - __main__ -   Process rank: -1, device: cuda:0, n_gpu: 4, distributed training: False, 16-bits training: False
Some weights of the model checkpoint at roberta-base were not used when initializing RobertaForMultipleChoice: ['lm_head.bias', 'lm_head.dense.weight', 'lm_head.dense.bias', 'lm_head.layer_norm.weight', 'lm_head.layer_norm.bias', 'lm_head.decoder.weight']
- This IS expected if you are initializing RobertaForMultipleChoice from the checkpoint of a model trained on another taskor with another architecture (e.g. initializing a BertForSequenceClassification model from a BertForPretraining model).
- This IS NOT expected if you are initializing RobertaForMultipleChoice from the checkpoint of a model that you expect to be exactly identical (initializing a BertForSequenceClassification model from a BertForSequenceClassification model).
Some weights of RobertaForMultipleChoice were not initialized from the model checkpoint at roberta-base and are newly initialized: ['classifier.weight', 'classifier.bias']
You should probably TRAIN this model on a down-stream task to be able to use it for predictions and inference.
Traceback (most recent call last):
  File "run_multiple_choice.py", line 237, in <module>
    main()
  File "run_multiple_choice.py", line 171, in main
    if training_args.do_train
  File "/home/admin/Monk/hf_mcq/utils_multiple_choice.py", line 113, in __init__
    with FileLock(lock_path):
  File "/home/admin/Monk/lib/python3.6/site-packages/filelock.py", line 323, in __enter__
    self.acquire()
  File "/home/admin/Monk/lib/python3.6/site-packages/filelock.py", line 271, in acquire
    self._acquire()
  File "/home/admin/Monk/lib/python3.6/site-packages/filelock.py", line 384, in _acquire
    fd = os.open(self._lock_file, open_mode)
FileNotFoundError: [Errno 2] No such file or directory: '/RACE/cached_train_RobertaTokenizer_80_race.lock'
```
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