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        <name type="personal">
            <namePart type="given">Ronghang</namePart>
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    <abstract>Phrase grounding (PG) is a multimodal task that grounds language in images. PG systems are evaluated on well-known benchmarks, using Intersection over Union (IoU) as evaluation metric. This work highlights a disconcerting bias in the evaluation of grounded plural phrases, which arises from representing sets of objects as a union box covering all component bounding boxes, in conjunction with the IoU metric. We detect, analyze and quantify an evaluation bias in the grounding of plural phrases and define a novel metric, c-IoU, based on a union box‘s component boxes. We experimentally show that our new metric greatly alleviates this bias and recommend using it for fairer evaluation of plural phrases in PG tasks.</abstract>
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%0 Conference Proceedings
%T Grounding Plural Phrases: Countering Evaluation Biases by Individuation
%A Suter, Julia
%A Parcalabescu, Letitia
%A Frank, Anette
%Y Hu, Ronghang
%Y Hudson, Drew
%Y Fu, Tsu-Jui
%Y Rohrbach, Marcus
%Y Fried, Daniel
%E Xin
%S Proceedings of the Second Workshop on Advances in Language and Vision Research
%D 2021
%8 June
%I Association for Computational Linguistics
%C Online
%F suter-etal-2021-grounding
%X Phrase grounding (PG) is a multimodal task that grounds language in images. PG systems are evaluated on well-known benchmarks, using Intersection over Union (IoU) as evaluation metric. This work highlights a disconcerting bias in the evaluation of grounded plural phrases, which arises from representing sets of objects as a union box covering all component bounding boxes, in conjunction with the IoU metric. We detect, analyze and quantify an evaluation bias in the grounding of plural phrases and define a novel metric, c-IoU, based on a union box‘s component boxes. We experimentally show that our new metric greatly alleviates this bias and recommend using it for fairer evaluation of plural phrases in PG tasks.
%R 10.18653/v1/2021.alvr-1.4
%U https://aclanthology.org/2021.alvr-1.4/
%U https://doi.org/10.18653/v1/2021.alvr-1.4
%P 22-28

Markdown (Informal)

[Grounding Plural Phrases: Countering Evaluation Biases by Individuation](https://aclanthology.org/2021.alvr-1.4/) (Suter et al., ALVR 2021)

• Grounding Plural Phrases: Countering Evaluation Biases by Individuation (Suter et al., ALVR 2021)

ACL

• Julia Suter, Letitia Parcalabescu, and Anette Frank. 2021. Grounding Plural Phrases: Countering Evaluation Biases by Individuation. In Proceedings of the Second Workshop on Advances in Language and Vision Research, pages 22–28, Online. Association for Computational Linguistics.