Recently, a myriad of conditional image generation and editing models have been developed to serve different downstream tasks, including text-to-image generation, text-guided image editing, subject-driven image generation, control-guided image generation, etc. However, we observe huge inconsistencies in experimental conditions: datasets, inference, and evaluation metrics - render fair comparisons difficult. This paper proposes ImagenHub, which is a one-stop library to standardize the inference and evaluation of all the conditional image generation models. Firstly, we define seven prominent tasks and curate high-quality evaluation datasets for them. Secondly, we built a unified inference pipeline to ensure fair comparison. Thirdly, we design two human evaluation scores, i.e. Semantic Consistency and Perceptual Quality, along with comprehensive guidelines to evaluate generated images. We train expert raters to evaluate the model outputs based on the proposed metrics. Our human evaluation achieves a high inter-worker agreement of Krippendorff's alpha on 76% models with a value higher than 0.4. We comprehensively evaluated a total of around 30 models and observed three key takeaways: (1) the existing models' performance is generally unsatisfying except for Text-guided Image Generation and Subject-driven Image Generation, with 74% models achieving an overall score lower than 0.5. (2) we examined the claims from published papers and found 83% of them hold with a few exceptions. (3) None of the existing automatic metrics has a Spearman's correlation higher than 0.2 except subject-driven image generation. Moving forward, we will continue our efforts to evaluate newly published models and update our leaderboard to keep track of the progress in conditional image generation.

翻译：近期，大量条件图像生成与编辑模型被开发用于服务不同的下游任务，包括文本到图像生成、文本引导图像编辑、主体驱动图像生成、控制引导图像生成等。然而，我们观察到实验条件存在巨大不一致性：数据集、推理和评估指标——使得公平对比变得困难。本文提出ImagenHub，这是一个一站式库，旨在标准化所有条件图像生成模型的推理与评估。首先，我们定义了七个重要任务并为其策划了高质量的评估数据集。其次，我们构建了统一的推理管线以确保公平对比。第三，我们设计了两个人类评估分数，即语义一致性和感知质量，并配套了全面的生成图像评估指南。我们训练专业评估员基于所提指标对模型输出进行评分。我们的人类评估在76%的模型上达到了Krippendorff's alpha高于0.4的高评分者间一致性。我们对总计约30个模型进行了综合评估，并观察到三个关键结论：（1）除文本引导图像生成和主体驱动图像生成外，现有模型的性能普遍不尽如人意，74%的模型总体得分低于0.5。（2）我们核查了已发表论文中的声称，发现其中83%成立，仅少数例外。（3）除主体驱动图像生成外，所有现有自动指标与人类评分的Spearman相关系数均未超过0.2。未来，我们将持续评估新发表的模型并更新排行榜，以跟踪条件图像生成领域的进展。