VisualGPTScore: Visio-Linguistic Reasoning with Multimodal Generative
  Pre-Training Scores
Authors: name: Zhiqiu Lin; name: Xinyue Chen; name: Deepak Pathak; name: Pengchuan Zhang; name: Deva Ramanan
Published: 2023-06-02 19:19:43

Abstract: Vision-language models (VLMs) discriminatively pre-trained with contrastive
image-text matching losses such as P(match|text, image)
have been criticized for lacking compositional understanding. This means they
might output similar scores even if the original caption is rearranged into a
different semantic statement. To address this, we propose to use the {bf
V}isual {bf G}enerative {bf P}re-{bf T}raining Score ({bf
VisualGPTScore}) of P(text|image), a multimodal
generative score that captures the likelihood of a text caption conditioned
on an image using an image-conditioned language model. Contrary to the belief
that VLMs are mere bag-of-words models, our off-the-shelf VisualGPTScore
demonstrates top-tier performance on recently proposed image-text retrieval
benchmarks like ARO and Crepe that assess compositional reasoning. Furthermore,
we factorize VisualGPTScore into a product of the marginal P(text)
and the Pointwise Mutual Information (PMI). This helps to (a)
diagnose datasets with strong language bias, and (b) debias results on other
benchmarks like Winoground using an information-theoretic framework.
VisualGPTScore provides valuable insights and serves as a strong baseline for
future evaluation of visio-linguistic compositionality.