arXiv Machine Learning By Jo\~ao A. C\^andido Ramos, Lionel Blond\'e, Hugues Vinzant, Jacopo Castellini, Alexandros Kalousis

FOCUS: First-Order Control Using Optimal Transport Supervision for Imitation from Observations

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FOCUS is a new imitation‑learning method that learns from state‑only demonstrations without temporal alignment. It uses local optimal‑transport alignment to match short agent rollouts with sampled expert segments, creating differentiable imitation rewards. A learned critic then bootstraps value beyond the rollout horizon, improving sample efficiency and training stability on contact‑rich locomotion tasks.

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