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• W3096304594 abstract "Recently, invariant risk minimization (IRM) was proposed as a promising solution to address out-of-distribution (OOD) generalization. However, it is unclear when IRM should be preferred over the widely-employed empirical risk minimization (ERM) framework. In this work, we analyze both these frameworks from the perspective of sample complexity, thus taking a firm step towards answering this important question. We find that depending on the type of data generation mechanism, the two approaches might have very different finite sample and asymptotic behavior. For example, in the covariate shift setting we see that the two approaches not only arrive at the same asymptotic solution, but also have similar finite sample behavior with no clear winner. For other distribution shifts such as those involving confounders or anti-causal variables, however, the two approaches arrive at different asymptotic solutions where IRM is guaranteed to be close to the desired OOD solutions in the finite sample regime, while ERM is biased even asymptotically. We further investigate how different factors -- the number of environments, complexity of the model, and IRM penalty weight -- impact the sample complexity of IRM in relation to its distance from the OOD solutions" @default.
• W3096304594 created "2020-11-09" @default.
• W3096304594 creator A5015286159 @default.
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• W3096304594 date "2020-10-30" @default.
• W3096304594 modified "2023-09-27" @default.
• W3096304594 title "Empirical or Invariant Risk Minimization? A Sample Complexity Perspective" @default.
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• W3096304594 hasPublicationYear "2020" @default.
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