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arXiv · 2604.18367

EAST: Early Action Prediction Sampling Strategy with Token Masking

Iva Sović·Ivan Martinović·Marin Oršić
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Abstract

Early action prediction seeks to anticipate an action before it fully unfolds, but limited visual evidence makes this task especially challenging. We introduce EAST, a simple and efficient framework that enables a model to reason about incomplete observations. In our empirical study, we identify key components when training early action prediction models. Our key contribution is a randomized training strategy that samples a time step separating observed and unobserved video frames, enabling a single model to generalize seamlessly across all test-time observation ratios. We further show that joint learning on both observed and future (oracle) representations significantly boosts performance, even allowing an encoder-only model to excel. To improve scalability, we propose a token masking procedure that cuts memory usage in half and accelerates training by 2x with negligible accuracy loss. Combined with a forecasting decoder, EAST sets a new state of the art on NTU60, SSv2, and UCF101, surpassing previous best work by 10.1, 7.7, and 3.9 percentage points, respectively.

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Iva Sović, Ivan Martinović, Marin Oršić. 2026-04-20. EAST: Early Action Prediction Sampling Strategy with Token Masking. https://arxiv.org/abs/2604.18367

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