BIGbench: A Unified Benchmark for Social Bias in Text-to-Image Generative Models Based on Multi-modal LLM

Text-to-Image (T2I) generative models are becoming more crucial in terms of their ability to generate complex and high-quality images, which also raises concerns about the social biases in their outputs, especially in human generation. Sociological research has established systematic classifications of bias; however, existing research of T2I models often conflates different types of bias, hindering the progress of these methods. In this paper, we introduce BIGbench, a unified benchmark for Biases of Image Generation with a well-designed dataset. In contrast to existing benchmarks, BIGbench classifies and evaluates complex biases into four dimensions: manifestation of bias, visibility of bias, acquired attributes, and protected attributes. Additionally, BIGbench applies advanced multi-modal LLMs (MLLM), achieving fully automated evaluation while maintaining high accuracy. We apply BIGbench to evaluate eight recent general T2I models and three debiased methods. We also conduct human evaluation, whose results demonstrated the effectiveness of BIGbench in aligning images and identifying various biases. Besides, our study also revealed new research directions about biases, including the side-effect of irrelevant protected attributes and distillation. Our dataset and benchmark is openly accessible to the research community to ensure the reproducibility.