We leverage cross-language data expansion and retraining to enhance neural Event Detection (abbr., ED) on the English ACE corpus. Machine translation is utilized for expanding the English training set of ED from that of Chinese. However, experimental results illustrate that such strategy actually results in performance degradation. The survey of translations suggests that the mistakenly-aligned triggers in the expanded data negatively influence the retraining process. We refer this phenomenon to “trigger falsification”. To overcome the issue, we apply heuristic rules for regulating the expanded data and fixing the distracting samples that contain the
falsified triggers. The supplementary experiments show that the rule-based regulation is beneficial, yielding the improvement of about 1.6% F1 score for ED. We additionally prove that, instead of transfer learning from the translated ED data, the straight data combination by random pouring surprisingly performs better.

Unregulated Chinese-to-English Data Expansion Does NOT Work for Neural Event Detection

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Zhongqiu Li

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Unregulated Chinese-to-English Data Expansion Does NOT Work for Neural Event Detection

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