ResearchResearch paperReinforcement Learning · Training & Scaling1 source · Oct 19, 2026

ActTime: Action-Conditioned World Modeling for Time Series

We introduce ActTime, an action-conditioned world model for time series.

Key points

  • Time-series models increasingly condition on known future inputs.
  • In controlled systems, some of these inputs are actions that can be changed, compared, and optimized before execution.
  • Over the observed history, ActTime updates variable-specific latent states through an action-conditioned transition and corrects them using observations.
  • We construct a simulator-grounded evaluation suite across building energy, traffic, greenhouse climate, and inventory management, covering factual prediction, intervention-effect prediction, offline decision making, and closed-loop planning.

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  6. Oct 16, 2026ORD-WM: Learning Object-Centric Rigid Dynamics for 3D World Modeling in Robotic Manipulation

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