run_ner.py example fails
I am trying to run the run_ner.py example described here: (https://huggingface.co/transformers/examples.html#named-entity-recognition)

When running the example I get the following exception:
```
I1217 09:36:10.744300 14416 file_utils.py:40] PyTorch version 1.3.1 available.
W1217 09:36:11.329299 14416 run_ner.py:422] Process rank: -1, device: cuda, n_gpu: 1, distributed training: False, 16-bits training: False
I1217 09:36:11.863193 14416 configuration_utils.py:160] loading configuration file https://s3.amazonaws.com/models.huggingface.co/bert/bert_base_uncased/config.json from cache at s3_cache\67674340071d93960fbc3eb74cf1d0b51de232689bfc75d63e3f4ab1c9a052f9
Traceback (most recent call last):
  File ".\run_ner.py", line 531, in <module>
    main()
  File ".\run_ner.py", line 441, in main
    cache_dir=args.cache_dir if args.cache_dir else None)
  File "C:\Program Files\Python\Python37\lib\site-packages\transformers\configuration_utils.py", line 163, in from_pretrained
    config = cls.from_json_file(resolved_config_file)
  File "C:\Program Files\Python\Python37\lib\site-packages\transformers\configuration_utils.py", line 196, in from_json_file
    return cls.from_dict(json.loads(text))
  File "C:\Program Files\Python\Python37\lib\json\__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "C:\Program Files\Python\Python37\lib\json\decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "C:\Program Files\Python\Python37\lib\json\decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
```
A JSON files does not seemed to be found. Can someone tell me which file this is?


A few questions (the ones asked in the issue templates...):
- which version/branch of `transformers` are you using?
- which exact command line are you running?<|||||>Hi,
sorry, my bad.

I am calling run_ner.py with
```
 python .\run_ner.py --data_dir ./ --model_type bert --labels .\labels.txt --model_name_or_path bert_base_uncased --output_dir pytorch_ner --max_seq_length 75 --n
um_train_epochs 5 --per_gpu_train_batch_size 12 --save_steps 750 --seed 4711 --do_train --do_eval --do_predict --cache_dir s3_cache
```
I am using transformers 2.2.2<|||||>The JSON file the Python script is trying to use is the configuration of BERT model (`config.json`)?

> I am trying to run the run_ner.py example described here: (https://huggingface.co/transformers/examples.html#named-entity-recognition)
> 
> When running the example I get the following exception:
> 
> ```
> I1217 09:36:10.744300 14416 file_utils.py:40] PyTorch version 1.3.1 available.
> W1217 09:36:11.329299 14416 run_ner.py:422] Process rank: -1, device: cuda, n_gpu: 1, distributed training: False, 16-bits training: False
> I1217 09:36:11.863193 14416 configuration_utils.py:160] loading configuration file https://s3.amazonaws.com/models.huggingface.co/bert/bert_base_uncased/config.json from cache at s3_cache\67674340071d93960fbc3eb74cf1d0b51de232689bfc75d63e3f4ab1c9a052f9
> Traceback (most recent call last):
>   File ".\run_ner.py", line 531, in <module>
>     main()
>   File ".\run_ner.py", line 441, in main
>     cache_dir=args.cache_dir if args.cache_dir else None)
>   File "C:\Program Files\Python\Python37\lib\site-packages\transformers\configuration_utils.py", line 163, in from_pretrained
>     config = cls.from_json_file(resolved_config_file)
>   File "C:\Program Files\Python\Python37\lib\site-packages\transformers\configuration_utils.py", line 196, in from_json_file
>     return cls.from_dict(json.loads(text))
>   File "C:\Program Files\Python\Python37\lib\json\__init__.py", line 348, in loads
>     return _default_decoder.decode(s)
>   File "C:\Program Files\Python\Python37\lib\json\decoder.py", line 337, in decode
>     obj, end = self.raw_decode(s, idx=_w(s, 0).end())
>   File "C:\Program Files\Python\Python37\lib\json\decoder.py", line 355, in raw_decode
>     raise JSONDecodeError("Expecting value", s, err.value) from None
> json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
> ```
> 
> A JSON files does not seemed to be found. Can someone tell me which file this is?<|||||>Do I have to retrieve the file from somewhere ? I assumed everything is retrieved automatically by the script?<|||||>Reminds me of this isse: https://github.com/huggingface/transformers/issues/2154<|||||>Well, the `bert_base_uncased` for the `model_name_or_path` option is not correct. Just use: `bert-base-uncased` :)<|||||>Yes, the `bert_base_uncased` should be `bert-base-uncased`.

I've improved these error messages on the master with #2164 by the way, it should be more explicit now that the configuration file can't be found.<|||||>@Horsmann Additionally, if you want to use an uncased model, make sure that you pass `--do_lower_case` to the `run_ner.py` script!<|||||>Thanks! It is working now. The exception looked like I am missing a file so I didn't checked for the model name.