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arXiv 2008.12442cs.LGstat.ML
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基于EM算法的半监督学习:非结构化和结构化预测的比较研究

Semi-supervised Learning with the EM Algorithm: A Comparative Study between Unstructured and Structured Prediction

University of Alabama(阿拉巴马大学)

Wenchong He, Zhe Jiang

摘要:

半监督学习旨在从标记和未标记的样本中学习预测模型。在这一领域进行了广泛的研究。在现有的工作中,期望最大化(EM)生成混合模型是一个流行的方法,由于明确的统计性质。然而,现有的基于EM的半监督学习的文献主要集中在非结构化预测,假设样本是独立和同分布的。基于EM的半监督方法在结构化预测中的研究有限。本文旨在通过对基于EM的半监督学习中的非结构化和结构化方法的比较研究来填补这一空白。具体来说,我们比较了它们的理论性质,发现这两种方法都可以被认为是一种泛化的自训练与软类分配的未标记的样本,但结构化的方法还考虑结构约束的软类分配。我们进行了一个案例研究,对现实世界的洪水映射数据集,比较这两种方法。结果表明,结构化EM是更强大的类混淆所造成的噪声和障碍的特点,在洪水映射应用程序的上下文中。

英文摘要:

Semi-supervised learning aims to learn prediction models from both labeled and unlabeled samples. There has been extensive research in this area. Among existing work, generative mixture models with Expectation-Maximization (EM) is a popular method due to clear statistical properties. However, existing literature on EM-based semi-supervised learning largely focuses on unstructured prediction, assuming that samples are independent and identically distributed. Studies on EM-based semi-supervised approach in structured prediction is limited. This paper aims to fill the gap through a comparative study between unstructured and structured methods in EM-based semi-supervised learning. Specifically, we compare their theoretical properties and find that both methods can be considered as a generalization of self-training with soft class assignment of unlabeled samples, but the structured method additionally considers structural constraint in soft class assignment. We conducted a case study on real-world flood mapping datasets to compare the two methods. Results show that structured EM is more robust to class confusion caused by noise and obstacles in features in the context of the flood mapping application.

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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