Paper page - ActionSplice: In-Flight Action Editing for Interactive World Models

Source: https://huggingface.co/papers/2609.08230 Published on Sep 8

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Submitted byhttps://huggingface.co/PardisTaghavi

pardison Sep 14

Abstract

ActionSplice introduces counterfactual state transport to splice revised actions into chunk-autoregressive video world models without replaying completed evaluations, improving fidelity and speed.

Chunk-autoregressive video world modelstypically condition each generated chunk on one action. An action received during sampling must therefore wait for the next chunk, condition future solver evaluations on a state produced under the previous action, or trigger rollback that repeats completed evaluations. We introduceActionSplice, an inference framework that formulates this problem asCounterfactual State Transport(CST). A lightweightcorrectortransports the interruptedbackbone-native representationtoward the matched state induced by the revised action at the same solver step. The world model and sampler remain frozen, and sampling resumes without replaying completed evaluations. The retargeting variant CST*{R} updates the entire active chunk, while the temporal-splicing variant CST*{T} preserves a temporal prefix and updates only the suffix. Across minWM-Wan Action2V and HY-WM1.5, CST*{R} reduces rollback-relativeLPIPSby 61.5% and 75.9% relative to direct condition swapping. CST*{T} reduces suffixLPIPSby 56.1% and 77.5%, respectively, while providing 2.73times and 1.69times pixel-ready speedups over waiting. Under the HY-WorldPlay protocol, CST_{R} obtains aPSNRof 25.66 dB, anSSIMof 0.6902, and anLPIPSof 0.1337 against the original rollout.

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