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Migrate model card from transformers-repo

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Read announcement at https://discuss.huggingface.co/t/announcement-all-model-cards-will-be-migrated-to-hf-co-model-repos/2755
Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/allenai/longformer-base-4096/README.md

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+ # longformer-base-4096
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+ [Longformer](https://arxiv.org/abs/2004.05150) is a transformer model for long documents.
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+ `longformer-base-4096` is a BERT-like model started from the RoBERTa checkpoint and pretrained for MLM on long documents. It supports sequences of length up to 4,096.
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+ Longformer uses a combination of a sliding window (local) attention and global attention. Global attention is user-configured based on the task to allow the model to learn task-specific representations.
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+ Please refer to the examples in `modeling_longformer.py` and the paper for more details on how to set global attention.
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+
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+
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+ ### Citing
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+ If you use `Longformer` in your research, please cite [Longformer: The Long-Document Transformer](https://arxiv.org/abs/2004.05150).
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+ ```
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+ @article{Beltagy2020Longformer,
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+ title={Longformer: The Long-Document Transformer},
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+ author={Iz Beltagy and Matthew E. Peters and Arman Cohan},
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+ journal={arXiv:2004.05150},
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+ year={2020},
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+ }
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+ ```
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+
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+ `Longformer` is an open-source project developed by [the Allen Institute for Artificial Intelligence (AI2)](http://www.allenai.org).
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+ AI2 is a non-profit institute with the mission to contribute to humanity through high-impact AI research and engineering.