论文标题

多视图堆叠中的查看选择:选择元学习者

View selection in multi-view stacking: Choosing the meta-learner

论文作者

van Loon, Wouter, Fokkema, Marjolein, Szabo, Botond, de Rooij, Mark

论文摘要

多视图堆叠是一个框架,用于结合描述相同对象集的不同视图(即不同的功能集)的信息。在此框架中,分别对每个视图对基础学习算法进行了训练,然后通过元学习算法将其预测组合在一起。在先前的研究中,被堆叠的刑法回归(一种多视图堆叠的特殊情况)已被证明可用于识别哪些观点对于预测最重要。在本文中,我们通过考虑将七种不同的算法用作元学习者来扩展这项研究,并评估其在模拟中的观点选择和分类性能以及对实际基因表达数据集的两个应用。我们的结果表明,如果视图选择和分类精度对于手头的研究都很重要,那么非负拉索,非负自适应拉索和非负弹性净网是合适的元学习者。这三个中的哪个恰好取决于研究环境。其余四个元学习者,即非负脊回归,非负向前进选择,稳定性选择和插值预测指标,几乎没有优势,以至于比其他三个更受欢迎。

Multi-view stacking is a framework for combining information from different views (i.e. different feature sets) describing the same set of objects. In this framework, a base-learner algorithm is trained on each view separately, and their predictions are then combined by a meta-learner algorithm. In a previous study, stacked penalized logistic regression, a special case of multi-view stacking, has been shown to be useful in identifying which views are most important for prediction. In this article we expand this research by considering seven different algorithms to use as the meta-learner, and evaluating their view selection and classification performance in simulations and two applications on real gene-expression data sets. Our results suggest that if both view selection and classification accuracy are important to the research at hand, then the nonnegative lasso, nonnegative adaptive lasso and nonnegative elastic net are suitable meta-learners. Exactly which among these three is to be preferred depends on the research context. The remaining four meta-learners, namely nonnegative ridge regression, nonnegative forward selection, stability selection and the interpolating predictor, show little advantages in order to be preferred over the other three.

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