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Improved Text Classification Via Contrastive Adversarial Training

Lin Pan, Chung-Wei Hang, Avirup Sil, Saloni Potdar . Proceedings of the AAAI Conference on Artificial Intelligence 2022 – 68 citations

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AAAI Datasets Evaluation Fine Tuning Model Architecture Security Training Techniques

We propose a simple and general method to regularize the fine-tuning of Transformer-based encoders for text classification tasks. Specifically, during fine-tuning we generate adversarial examples by perturbing the word embeddings of the model and perform contrastive learning on clean and adversarial examples in order to teach the model to learn noise-invariant representations. By training on both clean and adversarial examples along with the additional contrastive objective, we observe consistent improvement over standard fine-tuning on clean examples. On several GLUE benchmark tasks, our fine-tuned BERT Large model outperforms BERT Large baseline by 1.7% on average, and our fine-tuned RoBERTa Large improves over RoBERTa Large baseline by 1.3%. We additionally validate our method in different domains using three intent classification datasets, where our fine-tuned RoBERTa Large outperforms RoBERTa Large baseline by 1-2% on average.

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