Frozen video diffusion models, probed at optimal depth and noise levels, produce representations competitive with discriminative encoders across semantic and geometric video tasks in a single forward pass.
14 A Mutualk-NN alignment metric We describe the Mutual k-Nearest Neighbours (MkNN) alignment metric used throughout the paper, following [Huh et al., 2024, Zhu et al., 2026]
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Gen4U: Unifying Video Generation and Understanding via Diffusion
Frozen video diffusion models, probed at optimal depth and noise levels, produce representations competitive with discriminative encoders across semantic and geometric video tasks in a single forward pass.