In the SemEval dataset, the tweets with one of the three indication hashtags #not, #sarcasm, and #irony, are collected and human-annotated as one of four types: verbal irony by means of a polarity contrast, other verbal irony, situational irony, and non-ironic.
the false-alarm tweets, i.e., the non-ironic tweets with indication hashtags, are distinguished from the real ironic tweets in this dataset.