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NAOMI: Non-Autoregressive Multiresolution Sequence Imputation

Liu, Yukai and Yu, Rose and Zheng, Stephan and Zhan, Eric and Yue, Yisong (2019) NAOMI: Non-Autoregressive Multiresolution Sequence Imputation. . (Submitted)

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Missing value imputation is a fundamental problem in modeling spatiotemporal sequences, from motion tracking to the dynamics of physical systems. In this paper, we take a non-autoregressive approach and propose a novel deep generative model: Non-AutOregressive Multiresolution Imputation (NAOMI) for imputing long-range spatiotemporal sequences given arbitrary missing patterns. In particular, NAOMI exploits the multiresolution structure of spatiotemporal data to interpolate recursively from coarse to fine-grained resolutions. We further enhance our model with adversarial training using an imitation learning objective. When trained on billiards and basketball trajectories, NAOMI demonstrates significant improvement in imputation accuracy (reducing average prediction error by 60% compared to autoregressive counterparts) and generalization capability for long range trajectories in systems of both deterministic and stochastic dynamics.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Record Number:CaltechAUTHORS:20190205-100357088
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92657
Deposited By: Tony Diaz
Deposited On:05 Feb 2019 18:11
Last Modified:03 Oct 2019 20:46

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