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Missing Pattern Recognized Diffusion Imputation Model for Missing Not At Random
[Submitted on 25 May 2026] · 2026-05-26 · via cs.LG updates on arXiv.org

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Abstract:Missing data frequently arises across diverse domains, including time-series and image domains. In the real world, missing occurrences often depend on the unobservable values themselves, which are referred to as Missing Not at Random (MNAR). In this work, we introduce the Missing Pattern Recognized Diffusion Imputation Model (PRDIM), a novel framework that explicitly captures the missing pattern and precisely imputes unobserved values. PRDIM iteratively maximizes the likelihood of the joint distribution for observed values and missing mask under an Expectation-Maximization (EM) algorithm. In this sense, we first employ a pattern recognizer, which approximates the underlying missing pattern and provides guidance during every inference toward more plausible imputations with respect to the missing information. Through extensive experiments, we demonstrate that PRDIM consistently achieves strong imputation performance under MNAR settings across multiple data modalities.

Submission history

From: Gyuwon Sim [view email]
[v1] Mon, 25 May 2026 05:29:59 UTC (8,420 KB)

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