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Holistic Evaluation of Vision Language Models (VHELM): Extending the HELM Framework to VLMs

Holistic Evaluation of Vision Language Models (VHELM): Extending the HELM Framework to VLMs

Challenges in Evaluating Vision-Language Models (VLMs)

Evaluating Vision-Language Models (VLMs) is difficult due to the lack of comprehensive benchmarks. Most current evaluations focus on narrow tasks like visual perception or question answering, ignoring important factors such as fairness, multilingualism, bias, robustness, and safety. This limited approach can lead to models performing well in some areas but failing in critical real-world applications. A standardized and complete evaluation is essential to ensure VLMs are robust, fair, and safe in various environments.

Current Evaluation Methods

Current evaluation methods for VLMs include isolated tasks like image captioning and visual question answering (VQA). Benchmarks like A-OKVQA and VizWiz focus on specific tasks and do not assess the overall capabilities of the models. These methods often overlook important aspects such as bias related to sensitive attributes and performance across different languages, limiting effective judgment of a model’s readiness for deployment.

Introducing VHELM

Researchers from various institutions have proposed VHELM (Holistic Evaluation of Vision-Language Models) to address these gaps. VHELM integrates multiple datasets to evaluate nine critical aspects: visual perception, knowledge, reasoning, bias, fairness, multilingualism, robustness, toxicity, and safety. It standardizes evaluation procedures, allowing for fair comparisons across models, and is designed to be affordable and fast.

Key Features of VHELM

  • Evaluates 22 prominent VLMs using 21 datasets.
  • Uses standardized metrics like ‘Exact Match’ and Prometheus Vision for accurate assessments.
  • Employs zero-shot prompting to simulate real-world scenarios.
  • Analyzes over 915,000 instances for statistically significant results.

Findings from VHELM Evaluation

The evaluation of 22 VLMs across nine dimensions shows that no model excels in all areas, indicating performance trade-offs. For example, Claude 3 Haiku has bias issues compared to Claude 3 Opus, while GPT-4o shows strong robustness but struggles with bias and safety. Models with closed APIs generally perform better in reasoning and knowledge but have gaps in fairness and multilingualism. Overall, VHELM highlights the strengths and weaknesses of each model, emphasizing the need for a holistic evaluation system.

Conclusion

VHELM significantly enhances the assessment of Vision-Language Models by providing a comprehensive framework that evaluates performance across nine essential dimensions. This standardized approach allows for a complete understanding of a model’s robustness, fairness, and safety, paving the way for reliable and ethical AI applications in the future.

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