Challenge: Existing metrics for conditional image generation are opaque and lack explainability . evaluators of these metrics have limited ability to evaluate image synthesis tasks .
Approach: They propose a Visual Instruction-guided Explainable metric for evaluating conditional image models.
Outcome: The proposed model achieves a high Spearman correlation with human evaluations, but is weaker than GPT-4o and GPT-v in evaluating synthetic images.

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Challenge: Existing MLLMs rely on commercial models such as GPT-4o for evaluations, but they are not universally accessible.
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Challenge: Conditional image generation is a popular and personalization-oriented task, but there are challenges in developing task-agnostic, reliable, and explainable evaluation metrics.
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Challenge: Existing methods to evaluate the quality of language generation do not provide explicit explanation of their verdicts.
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Challenge: Existing studies on explainable evaluation metrics generate explanations without standardized criteria and the overall quality of the generated explanations remains unverified.
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Challenge: Existing learning metrics are limited to tasks where large human ratings are available.
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Challenge: Existing image captioning evaluation metrics do not provide an explanation for the assigned numerical score.
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Challenge: Existing learned metrics perform unsatisfactory across text generation tasks or require human annotations for training on specific tasks.
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Challenge: Large Language Models (LLMs) lack the capacity to handle multimodal inputs effectively.
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Challenge: Several softwares for text evaluation are available that do not provide detailed examples.
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