I-BERT: expected str, bytes or os.PathLike object, not NoneType
Hi, I have an issue when running this code provided by the HF documentation:
>>> from transformers import RobertaTokenizer, IBertForTokenClassification
>>> import torch

>>> tokenizer = RobertaTokenizer.from_pretrained('kssteven/ibert-roberta-base')

When running this i get the following error for the tokenizer:
TypeError: expected str, bytes or os.PathLike object, not NoneType
Hi! I believe this checkpoint does not have a slow tokenizer, only a fast tokenizer. Can you try with:

```py
from transformers import RobertaTokenizerFast
tokenizer = RobertaTokenizerFast.from_pretrained('kssteven/ibert-roberta-base')
```<|||||>Thank you! It loaded the tokenizer without showing an error.