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• W3101478412 abstract "Recent work has shown the importance of adaptation of broad-coverage contextualised embedding models on the domain of the target task of interest. Current self-supervised adaptation methods are simplistic, as the training signal comes from a small percentage of emph{randomly} masked-out tokens. In this paper, we show that careful masking strategies can bridge the knowledge gap of masked language models (MLMs) about the domains more effectively by allocating self-supervision where it is needed. Furthermore, we propose an effective training strategy by adversarially masking out those tokens which are harder to reconstruct by the underlying MLM. The adversarial objective leads to a challenging combinatorial optimisation problem over emph{subsets} of tokens, which we tackle efficiently through relaxation to a variational lowerbound and dynamic programming. On six unsupervised domain adaptation tasks involving named entity recognition, our method strongly outperforms the random masking strategy and achieves up to +1.64 F1 score improvements." @default.
• W3101478412 created "2020-11-23" @default.
• W3101478412 creator A5036447132 @default.
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• W3101478412 date "2020-10-05" @default.
• W3101478412 modified "2023-09-26" @default.
• W3101478412 title "Effective Unsupervised Domain Adaptation with Adversarially Trained Language Models" @default.
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• W3101478412 hasPublicationYear "2020" @default.
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