Similar issue like #1091 in Blenderbot
Tokenizer and model are not in sync. I am using "facebook/blenderbot-400M-distill" 

Tokenizer has 8009 base tokens where as model has 8008. 

Could you please help me with this?

`from transformers import BlenderbotTokenizer, BlenderbotForConditionalGeneration

mname = "facebook/blenderbot-400M-distill"

model = BlenderbotForConditionalGeneration.from_pretrained(mname)
tokenizer = BlenderbotTokenizer.from_pretrained(mname, local_files_only=True)

print(len(tokenizer))
print(model.config.to_dict()['vocab_size'])`

Here is the output that I get.
8009
8008


## Environment info

- `transformers` version: 4.3.2
- Platform: Windows-10-10.0.18362-SP0
- Python version: 3.8.6
- PyTorch version (GPU?): 1.7.1+cpu (False)
- Tensorflow version (GPU?): 2.3.1 (False)
- Using GPU in script?: <fill in>
- Using distributed or parallel set-up in script?: <fill in>

- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj



Do you encounter any errors because of the mismatch in length?<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.