GEC-CL: Grammatical Error Correction with Contrastive Learning in Low Error Density Domains

Hannan Cao, Wenmian Yang, Hwee Tou Ng. Grammatical Error Correction with Contrastive Learning in Low Error Density Domains. In Findings of EMNLP 2021 [paper][code]

Codes in the two directories are the GEC-CL systems for GEC-PD and GEC-BART

Runtime Environment:

This system has been tested in the following environment.

• OS: Ubuntu 18.04.2 LTS 64 bits
• Python version 3.7.11
• Pytorch version 1.7.1
• CUDA Version 10.1

Dataset:

CWEB dataset

For GEC-PD system:

• Go to the gec-pseudo folder and carry out the following instructions

• Download all the required packedges and checkpoints from GEC-PD.

• Go to fairseq folder and install fairseq by:

cd fairseq
pip install --editable .

• Download generated positive and negative samples in data.

• Fine-tune the model for CL using 1 GPU using the train.sh in train-scripts folder, please specify the path to your gec-pseudo folder and path to your binarized data folder.

chmod +x train.sh
./train.sh 0 model/test-cl

• Fine-tune the model for CL- using 1 GPU using the train-.sh in train-scripts folder, please specify the path to your gec-pseudo folder and path to your binarized data folder.

chmod +x train-.sh
./train-.sh 0 model/test-cl-

• Make prediction using predict.sh, for example:

./predict.sh 0 CWEB/data/tokenized/CWEB-G.test.tok.source G_3 model/test-cl/checkpoint3.pt output/test-cl

• Use ERRANT toolkit to obtain the score, you should get the following result

Method	Domain	Annotation	P	R	F0.5
CL-	S	0	41.30	18.53	33.15
CL-	S	1	32.39	17.51	27.68
CL-	G	0	42.23	19.59	34.30
CL-	G	1	33.07	20.57	29.49
CL	S	0	41.48	21.44	34.94
CL	S	1	31.11	19.37	27.74
CL	G	0	42.41	23.01	36.29
CL	G	1	32.00	23.28	29.77

For GEC-BART system:

• Go to the BART-GEC folder and carry out the following instructions

• Download all the required packedges and checkpoints from GEC-BART.

• Follow the instruction from GEC-BART to train the model on BEA first.

• Go to GEC-BART folder and install fairseq by:

pip install --editable .

• Download generated positive and negative samples in data.

• Fine-tune the model for CL using 4 GPUs using the train.sh in train-scripts folder, please specify the path to your BART-GEC folder, path to your trained BART model and path to your binarized data folder.

chmod +x train.sh
./train.sh 0,1,2,3 0.85 0.5 model/4gpu-cweb-0.85-0.5

• Fine-tune the model for CL- using 4 GPUs using the train-.sh in train-scripts folder, please specify the path to your BART-GEC folder, path to your trained BART model and path to your binarized data folder.

chmod +x train-.sh
./train-.sh 0,1,2,3 0.85 0.5 model/4gpu-cweb-0.85-0.5-

• Make prediction using translate-flexible-data.py. For example:

CUDA_VISIBLE_DEVICES=0 python3 translate-flexible-data.py --model_dir=model/4gpu-cweb-0.85-0.5 \
                --input_text=CWEB/data/tokenized/CWEB-S.test.tok.source \
                --output_dir=output/cweb-0.85-0.5-4gpu/S_18.txt \
                --checkpoint_file=checkpoint18.pt \
                --data_path=beam-sample-with-refined-counts/CWEB-3-data-bin

• Use ERRANT toolkit to obtain the score, you should get the following result

Method	Domain	Annotation	P	R	F0.5
CL-	S	0	45.25	14.71	31.98
CL-	S	1	33.24	13.02	25.36
CL-	G	0	47.54	15.54	33.68
CL-	G	1	36.45	15.98	29.02
CL	S	0	46.98	16.26	34.10
CL	S	1	33.33	13.89	26.05
CL	G	0	50.00	16.79	35.82
CL	G	1	37.35	16.82	30.02

Output

Our output result reported in the paper can be found in output folder.

Model Checkpoints

The fine-tuned checkpoints we obtained can be found in GEC-BART-ckpt and GEC-PD-ckpt.

Citation

If you found our paper or code useful, please cite as:

@inproceedings{cao-etal-2021-grammatical-error,
    title = "Grammatical Error Correction with Contrastive Learning in Low Error Density Domains",
    author = "Cao, Hannan  and
      Yang, Wenmian  and
      Ng, Hwee Tou",
    booktitle = "Findings of the Association for Computational Linguistics: EMNLP 2021",
    month = nov,
    year = "2021",
    address = "Punta Cana, Dominican Republic",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/2021.findings-emnlp.419",
    pages = "4867--4874",
}