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• W3217604114 abstract "Over the past few years, various word-level textual attack approaches have been proposed to reveal the vulnerability of deep neural networks used in natural language processing. Typically, these approaches involve an important optimization step to determine which substitute to be used for each word in the original input. However, current research on this step is still rather limited, from the perspectives of both problem-understanding and problem-solving. In this paper, we address these issues by uncovering the theoretical properties of the problem and proposing an efficient local search algorithm (LS) to solve it. We establish the <italic xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>first</i> provable approximation guarantee on solving the problem in general cases. Extensive experiments involving 5 NLP tasks, 8 datasets and 26 NLP models show that LS can largely reduce the number of queries usually by an order of magnitude to achieve high attack success rates. Further experiments show that the adversarial examples crafted by LS usually have higher quality, exhibit better transferability, and can bring more robustness improvement to victim models by adversarial training." @default.
• W3217604114 created "2021-12-06" @default.
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• W3217604114 date "2022-01-01" @default.
• W3217604114 modified "2023-09-23" @default.
• W3217604114 title "Efficient Combinatorial Optimization for Word-Level Adversarial Textual Attack" @default.
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• W3217604114 doi "https://doi.org/10.1109/taslp.2021.3130970" @default.
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