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arXiv 1904.09552cs.CL
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理解医学概念嵌入的稳定性

Understanding the Stability of Medical Concept Embeddings

Nanyang Technological University(南洋理工大学)

Grace E. Lee, Aixin Sun

AI总结:

本文分析医学概念嵌入稳定性,发现低频概念同样高度稳定,并提出上下文词噪声程度这一与频率无关的影响因素。

摘要:

频率是训练高质量词嵌入的主要因素之一。近期已有若干研究讨论了通用领域中词嵌入的稳定性,并提出了影响稳定性的因素。在本研究中,我们对医学领域中概念嵌入的稳定性进行了详细分析,尤其是其与概念频率之间的关系。分析揭示了低频概念令人惊讶的高稳定性:低频(<100)概念具有与高频(>1000)概念相同的高稳定性。为了更深入地理解这一发现,我们提出了一个新的因素,即上下文词的噪声程度,该因素会影响医学概念嵌入的稳定性,且与频率无关。我们通过展示该因素与医学概念嵌入稳定性之间的线性相关性,对所提出的因素进行评估。这种相关性在不同医学概念组中都清晰且一致。基于这些线性关系,我们就如何调整上下文词的噪声程度以提升稳定性提出建议。最后,我们证明所提出的因素也可推广到通用领域中的词嵌入稳定性。

英文摘要:

Frequency is one of the major factors for training quality word embeddings. Several work has recently discussed the stability of word embeddings in general domain and suggested factors influencing the stability. In this work, we conduct a detailed analysis on the stability of concept embeddings in medical domain, particularly the relation with concept frequency. The analysis reveals the surprising high stability of low-frequency concepts: low-frequency (<100) concepts have the same high stability as high-frequency (>1000) concepts. To develop a deeper understanding of this finding, we propose a new factor, the noisiness of context words, which influences the stability of medical concept embeddings, regardless of frequency. We evaluate the proposed factor by showing the linear correlation with the stability of medical concept embeddings. The correlations are clear and consistent with various groups of medical concepts. Based on the linear relations, we make suggestions on ways to adjust the noisiness of context words for the improvement of stability. Finally, we demonstrate that the proposed factor extends to the word embedding stability in general domain.

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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