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Fighting FIRe with FIRE: Assessing the Validity of Text-to-Video Retrieval Benchmarks

2022-10-10 22:45:06
Pedro Rodriguez, Mahmoud Azab, Becka Silvert, Renato Sanchez, Linzy Labson, Hardik Shah, Seungwhan Moon

Abstract

Searching vast troves of videos with textual descriptions is a core multimodal retrieval task. Owing to the lack of a purpose-built dataset for text-to-video retrieval, video captioning datasets have been re-purposed to evaluate models by (1) treating captions as positive matches to their respective videos and (2) all other videos as negatives. However, this methodology leads to a fundamental flaw during evaluation: since captions are marked as relevant only to their original video, many alternate videos also match the caption, which creates false-negative caption-video pairs. We show that when these false negatives are corrected, a recent state-of-the-art model gains 25% recall points -- a difference that threatens the validity of the benchmark itself. To diagnose and mitigate this issue, we annotate and release 683K additional caption-video pairs. Using these, we recompute effectiveness scores for three models on two standard benchmarks (MSR-VTT and MSVD). We find that (1) the recomputed metrics are up to 25% recall points higher for the best models, (2) these benchmarks are nearing saturation for Recall@10, (3) caption length (generality) is related to the number of positives, and (4) annotation costs can be mitigated by choosing evaluation sizes corresponding to desired effect size to detect. We recommend retiring these benchmarks in their current form and make recommendations for future text-to-video retrieval benchmarks.

Abstract (translated)

URL

https://arxiv.org/abs/2210.05038

PDF

https://arxiv.org/pdf/2210.05038.pdf


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