Before revision: Recent work has demonstrated the vulnerability of modern text classifiers to universal adversarial attacks, which are input-agnostic sequence of words added to any input instance . Despite being highly successful, the word sequences produced in these attacks are often unnatural, do not carry much semantic meaning, and can be easily distinguished from natural text.
After revision: Recent work has demonstrated the vulnerability of modern text classifiers to universal adversarial attacks, which are input-agnostic sequence of words added to any input instance . Despite being highly successful, the word sequences produced in these attacks are often ungrammatical and can be easily distinguished from natural text.