ChartLens enhances multimodal language models with fine-grained visual attributions, improving the accuracy of chart understanding by 26-66%.
The growing capabilities of multimodal large language models (MLLMs) have
advanced tasks like chart understanding. However, these models often suffer
from hallucinations, where generated text sequences conflict with the provided
visual data. To address this, we introduce Post-Hoc Visual Attribution for
Charts, which identifies fine-grained chart elements that validate a given
chart-associated response. We propose ChartLens, a novel chart attribution
algorithm that uses segmentation-based techniques to identify chart objects and
employs set-of-marks prompting with MLLMs for fine-grained visual attribution.
Additionally, we present ChartVA-Eval, a benchmark with synthetic and
real-world charts from diverse domains like finance, policy, and economics,
featuring fine-grained attribution annotations. Our evaluations show that
ChartLens improves fine-grained attributions by 26-66%.
