• Pytorch >= 1.0
• Pytorch-transformer == 1.2.0 pip install pytorch-transformers==1.2.0

Download the SemEval dataset on http://alt.qcri.org/semeval2014/task4/index.php?id=data-and-tools

XML files are converted to text files, where each input sentence follows the format below:

Sentence: "$T$ is super fast , around anywhere from 35 seconds to 1 minute ."
Target word in place of $T$: "Boot time"
Polarity: 1

For exampled output, please find files in datasets/semeval14

The command to train LCFS-BERT with context dynamic weight and SRD threshold = 4:

python train.py --model_name lcfs_bert --dataset restaurant \
 --pretrained_bert_name bert-base-cased \
 --batch_size 32 --local_context_focus cdw --SRD 4

Some important scripts to note:

• datasets/semeval14/*.seg: Preprocessed training and testing sentences in SemEval2014.
• models/lcfs_bert.py: the source code of LCFS_BERT model.
• data_utils.py/ABSADataSet class: preprocess the tokens and calculates the shortest distance to target words via the syntax tree.

You can find the source code of CSAE model in the google drive link. https://drive.google.com/file/d/122lax53-4jDfHtQSvz-rINMSkodGK9uG/view?usp=sharing

Please run the script src/run_ae.py as:

python run_ae.py \ --bert_model roberta-base --do_train --do_valid \ --max_seq_length 100 --train_batch_size 32 --learning_rate 3e-5 --num_train_epochs 20 \ --output_dir LAPTOP_OUT_DIR --data_dir ../ae/laptop To validate: python eval/evaluate.py --pred LAPTOP_OUT_DIR/prediction.json --target data/laptop/laptops--test.gold.xml

The CSAE model is the class RobertaPOSClassificationHead in model.py. It uses the dependency-word embedding in "/ae/emb.npy".

Those are some basic usage about the model.

We have based our model development on https://github.com/songyouwei/ABSA-PyTorch. Thanks for their contribution.

If you found this repository is helpful, please cite our paper:

@inproceedings{phan2020modelling,
  title={Modelling Context and Syntactical Features for Aspect-based Sentiment Analysis},
  author={Phan, Minh Hieu and Ogunbona, Philip O},
  booktitle={Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics},
  pages={3211--3220},
  year={2020}
}