Longformer model with weight(model.encoder.embed_positions.weight) error

```bash
RuntimeError: Error(s) in loading state_dict for BartModel:
size mismatch for model.encoder.embed_positions.weight: copying a param with shape torch.Size([16386, 768]) from checkpoint, the shape in current model is torch.Size([1026, 768]).
```

I use longformer model called longformer-encdec-base-16384 which is downloaded in https://github.com/allenai/longformer，and use huggingface to load the model，when transformers’ version is 3.1.0， the code can run, but when it is 4.4.2，the error happened.

MeanWhile,when I use the model to proposal pairs of sentences，I found it that the returned token_type_ids values are just zero
without one. how ever,in the model's special_tokens_map.json, it has defined cls_token and sep_token.

Finally, I sincerely hope you would reply me soon. Thanks！