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About this paper

Yiming Cui, Ting Liu, Wanxiang Che, Zhigang Chen, Shijin Wang

A new benchmark, ExpMRC, is introduced for evaluating the explainability of Machine Reading Comprehension (MRC) systems across English and Chinese, and both span-extraction and multi-choice tasks. The benchmark, which focuses on unsupervised evidence extraction, reveals that current state-of-the-art models are still significantly below human performance in generating explanations.

Key insights

  • Current state-of-the-art MRC models are significantly behind human performance in providing accurate explanations, especially for multi-choice tasks.
  • The effectiveness of evidence extraction methods varies by task type, with token-similarity approaches performing better for span-extraction and pseudo-data training being more suitable for multi-choice tasks.
  • Integrating question context is crucial for identifying relevant evidence, and there is substantial room for improvement in extracting precise, sub-sentence evidence.

Summary by alphaXiv.

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