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What FVD Catches That Averaged Frame-Level FID Cannot
Part of the ML System Design Interview path →
Part of the Generative Vision & Image AI System Design path →
Your evaluation dashboard reports FID and Inception Score, computed per frame and averaged across all frames in each generated video. A new model version shows a meaningfully better averaged FID than the previous version, and the team is ready to ship it as a quality win. Before shipping, a reviewer asks you to also check Fréchet Video Distance (FVD).
- Explain what averaged per-frame FID does and does not measure about a generated video.
- Walk through how FVD is computed, and explain specifically what makes it sensitive to something FID is not.
- Propose a concrete scenario consistent with "averaged FID improved" where FVD could nonetheless get worse, and explain why checking FVD before shipping is the right call.
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