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arXiv 2207.02808stat.MLcs.LG
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改进的保形分位数回归

Improved conformalized quantile regression

University of Aveiro(阿威罗大学)

Martim Sousa, Ana Maria Tomé, José Moreira

AI总结:

针对保形分位数回归单一保形步骤缺乏自适应性的问题,提出基于排列重要性加权解释变量的优化k-means聚类并执行k个保形步骤,在开放数据集上验证其更适应异方差且优于经典方法。

摘要:

保形分位数回归是一种继承了保形预测和分位数回归优点的程序。也就是说,我们使用分位数回归来估计真实的条件分位数,然后在校准集上应用一个保形步骤,以确保边际覆盖率。通过这种方式,我们得到了能够解释异方差性的自适应预测区间。然而,如(Romano等人,2019)所述,上述保形步骤缺乏自适应性。为了克服这一局限,我们不再在用分位数回归估计条件分位数之后应用单一保形步骤,而是提出用优化的k-means对按其排列重要性加权的解释变量进行聚类,并应用k个保形步骤。为了证明这一改进版本优于经典版本的保形分位数回归,并且对异方差性具有更强的自适应性,我们在开放数据集上广泛比较了两者的预测区间。

英文摘要:

Conformalized quantile regression is a procedure that inherits the advantages of conformal prediction and quantile regression. That is, we use quantile regression to estimate the true conditional quantile and then apply a conformal step on a calibration set to ensure marginal coverage. In this way, we get adaptive prediction intervals that account for heteroscedasticity. However, the aforementioned conformal step lacks adaptiveness as described in (Romano et al., 2019). To overcome this limitation, instead of applying a single conformal step after estimating conditional quantiles with quantile regression, we propose to cluster the explanatory variables weighted by their permutation importance with an optimized k-means and apply k conformal steps. To show that this improved version outperforms the classic version of conformalized quantile regression and is more adaptive to heteroscedasticity, we extensively compare the prediction intervals of both in open datasets.

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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