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arXiv 2204.04580cs.CL
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对可解释的NLP的人类注释的重新审视

Re-Examining Human Annotations for Interpretable NLP

National Taiwan University(台湾大学)

Cheng-Han Chiang, Hung-yi Lee

摘要:

可解释NLP中的解释方法通常通过从支持决策的输入文本中提取证据(理由)来解释模型的决策。已经发布了基本原理的基准数据集,以评价基本原理的良好程度。这些数据集中的地面真实原理通常是通过众包网站获得的人类注释。尽管这些数据集很有价值,但关于如何获得这些人类注释的细节往往没有明确规定。我们使用众包网站对可解释NLP中两个广泛使用的数据集进行了全面的对照实验,以了解这些未说的细节如何影响注释结果。具体来说,我们比较了从招聘满足不同资格水平的工人获得的注释结果。我们还为高素质的员工提供不同的指令,以完成相同的底层任务。结果表明,标注质量受标注人员资质的影响较大,标注人员可以通过说明书进行标注。我们进一步表明,具体的解释方法进行更好的评价时,使用特定指令获得的地面真理的理由。基于这些观察,我们强调了提供注释过程的完整细节的重要性,并呼吁对使用这些注释获得的任何实验结果进行仔细解释。

英文摘要:

Explanation methods in Interpretable NLP often explain the model's decision by extracting evidence (rationale) from the input texts supporting the decision. Benchmark datasets for rationales have been released to evaluate how good the rationale is. The ground truth rationales in these datasets are often human annotations obtained via crowd-sourced websites. Valuable as these datasets are, the details on how those human annotations are obtained are often not clearly specified. We conduct comprehensive controlled experiments using crowd-sourced websites on two widely used datasets in Interpretable NLP to understand how those unsaid details can affect the annotation results. Specifically, we compare the annotation results obtained from recruiting workers satisfying different levels of qualification. We also provide high-quality workers with different instructions for completing the same underlying tasks. Our results reveal that the annotation quality is highly subject to the workers' qualification, and workers can be guided to provide certain annotations by the instructions. We further show that specific explanation methods perform better when evaluated using the ground truth rationales obtained by particular instructions. Based on these observations, we highlight the importance of providing complete details of the annotation process and call for careful interpretation of any experiment results obtained using those annotations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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