Revisiting Text-to-Image Evaluation with Gecko: On Metrics, Prompts, and Human Ratings

Olivia Wiles; Chuhan Zhang; Isabela Albuquerque; Ivana Kajić; Su Wang; Emanuele Bugliarello; Yasumasa Onoe; Pinelopi Papalampidi; Ira Ktena; Chris Knutsen; Cyrus Rashtchian; Anant Nawalgaria; Jordi Pont-Tuset; Aida Nematzadeh

arXiv · 2404.16820

Revisiting Text-to-Image Evaluation with Gecko: On Metrics, Prompts, and Human Ratings

Olivia Wiles·Chuhan Zhang·Isabela Albuquerque·Ivana Kajić·Su Wang·Emanuele Bugliarello·Yasumasa Onoe·Pinelopi Papalampidi·Ira Ktena·Chris Knutsen·Cyrus Rashtchian·Anant Nawalgaria·Jordi Pont-Tuset·Aida Nematzadeh

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Abstract

While text-to-image (T2I) generative models have become ubiquitous, they do not necessarily generate images that align with a given prompt. While previous work has evaluated T2I alignment by proposing metrics, benchmarks, and templates for collecting human judgements, the quality of these components is not systematically measured. Human-rated prompt sets are generally small and the reliability of the ratings -- and thereby the prompt set used to compare models -- is not evaluated. We address this gap by performing an extensive study evaluating auto-eval metrics and human templates. We provide three main contributions: (1) We introduce a comprehensive skills-based benchmark that can discriminate models across different human templates. This skills-based benchmark categorises prompts into sub-skills, allowing a practitioner to pinpoint not only which skills are challenging, but at what level of complexity a skill becomes challenging. (2) We gather human ratings across four templates and four T2I models for a total of >100K annotations. This allows us to understand where differences arise due to inherent ambiguity in the prompt and where they arise due to differences in metric and model quality. (3) Finally, we introduce a new QA-based auto-eval metric that is better correlated with human ratings than existing metrics for our new dataset, across different human templates, and on TIFA160.

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Olivia Wiles, Chuhan Zhang, Isabela Albuquerque, Ivana Kajić, Su Wang, Emanuele Bugliarello, Yasumasa Onoe, Pinelopi Papalampidi, Ira Ktena, Chris Knutsen, Cyrus Rashtchian, Anant Nawalgaria, Jordi Pont-Tuset, Aida Nematzadeh. 2025-03-17. Revisiting Text-to-Image Evaluation with Gecko: On Metrics, Prompts, and Human Ratings. https://arxiv.org/abs/2404.16820

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