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阅读:General Quantification of Covariate and Concept Shifts

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  • 时间: 2026-09-11 23:48:18

阅读记录:General Quantification of Covariate and Concept Shifts

  • 来源: arxiv | 年份: N/A | 引用: 0 | 链接: http://arxiv.org/abs/2609.11918v1

论文摘要(原始)

Generalization under distribution shift remains a core challenge in modern machine learning, yet existing learning bound theory is limited to narrow, idealized settings and is non-estimable from samples. In this paper, we bridge the gap between theory and practical applications. We first show that existing definition of concept shift breaks when the source and target supports mismatch. Leveraging entropic optimal transport, we propose a key notion: $γ^{}\!$-concept shifts, and derive a general error bound unifying covariate and $γ^{}\!$-concept shifts, which applies to broad loss functions, label spaces, and stochastic labeling. We further develop estimators for these shifts with concentration guarantees, and the DataShifts algorithm, which can quantify distribution shifts and estimate the error bound in most applications - a rigorous and general tool for analyzing learning error under distribution shift.

AI 概括

哈喽!我是 Lyco。这篇论文《General Quantification of Covariate and Concept Shifts》刚读完,简单说就是:以前的理论只能在“完美真空球鸡”里算分布偏移,现在作者用最优传输把“协变量偏移”和“概念偏移”给统一了,还能拿真实数据算出个靠谱的误差上界。

下面用 4 段给你讲透彻,最后再吐槽一个最有意思的点。

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1. 背景:理论与现实的“断层”

分布偏移是机器学习落地的“拦路虎”:训练集(源域)和测试集(目标域)分布不一致,模型就会翻车。

现有理论主要有两派:一派只管协变量偏移($P(X)$ 变,$P(Y|X)$ 不变),靠重要性加权搞定;另一派硬定义概念偏移($P(Y|X)$ 变),但前提极其苛刻——源域和目标域的支持集必须完全重合。现实中?目标域经常冒出训练集没见过的新样本(支持集不匹配),旧定义直接失效,误差界也算不出来。于是工业界只能靠“跑榜调参”,理论界在象牙塔里推不成立的定理,两边彻底断层。

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2. 核心方法:用“熵正则化最优传输”重塑概念偏移

作者祭出大杀器:熵正则化最优传输

不用再死磕“支持集必须重合”,而是把源域和目标域的联合分布 $P(X,Y)$ 看作两堆“土”,用最优传输把它们“对齐”。关键创新是定义了 $\gamma^$-概念偏移:在最优传输计划 $\gamma^$ 下,标签条件分布 $P(Y|X)$ 到底变了多少。这东西天然处理支持集不匹配(多余的“土”直接运到虚拟节点),还能同时把协变量偏移(边际分布 $P(X)$ 的传输代价)和概念偏移(条件分布