This repo contains code for our ACL'2021 paper: Cascaded Head-colliding Attention. We use Fairseq codebase for our machine translation and language modeling experiments.

Please ensure that:

• PyTorch version >= 1.5.0
• Python version >= 3.6

To install our codebase:

git clone https://github.com/LZhengisme/CODA
cd CODA
pip install --editable ./

Please refer to the official repository in Fairseq for preparation details.

• For IWSLT-14 de-en dataset, we follow here to pre-process and binarize data.
• For WMT-14 en-de dataset, follow here to prepare for data; note that you need to first download the preprocessed data provided by Google.
• For Wikitext-103, follow here to pre-process and binarize data.

We provide a series of scripts (located at experiments folder) for training or evaluating models on both machine translation and language modeling. Further details and hyper-parameter settings can be found either in these scripts or our paper.

Taking IWSLT-14 dataset as an example, the following command would train our CODA model with default settings:

bash experiments/iwslt14-train.sh GPUS=0,1,2,3 BG=1

• Assuming there are 4 GPUs available, and
• BG=1 indicates that the script will run in background (via nohup). All of checkpoints and the training log will be saved in checkpoints/coda-iwslt14-de-en-<current time> folder.

To evaluate the trained model:

bash experiments/iwslt14-eval.sh -p checkpoints/coda-iwslt14-de-en-<current time> -g 0

• -p must be specified as the path where your checkpoints are saved, and
• -g (optional) is used for selection GPUs (default selecting GPU 0).

If everything goes smoothly, you should get a decent BLEU score (~35.7) after training 100 epochs.

Please cite our paper as:

@inproceedings{zheng-etal-2021-cascaded,
    title = "Cascaded Head-colliding Attention",
    author = "Zheng, Lin  and
      Wu, Zhiyong  and
      Kong, Lingpeng",
    booktitle = "ACL-IJCNLP",
    year = "2021",
    url = "https://aclanthology.org/2021.acl-long.45",
    doi = "10.18653/v1/2021.acl-long.45",
}

Our code is based on Fairseq. To cite Fairseq:

@inproceedings{ott2019fairseq,
  title = {fairseq: A Fast, Extensible Toolkit for Sequence Modeling},
  author = {Myle Ott and Sergey Edunov and Alexei Baevski and Angela Fan and Sam Gross and Nathan Ng and David Grangier and Michael Auli},
  booktitle = {Proceedings of NAACL-HLT 2019: Demonstrations},
  year = {2019},
}