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arXiv · 2310.06641

How (not) to ensemble LVLMs for VQA

Lisa Alazraki·Lluis Castrejon·Mostafa Dehghani·Fantine Huot·Jasper Uijlings·Thomas Mensink
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Abstract

This paper studies ensembling in the era of Large Vision-Language Models (LVLMs). Ensembling is a classical method to combine different models to get increased performance. In the recent work on Encyclopedic-VQA the authors examine a wide variety of models to solve their task: from vanilla LVLMs, to models including the caption as extra context, to models augmented with Lens-based retrieval of Wikipedia pages. Intuitively these models are highly complementary, which should make them ideal for ensembling. Indeed, an oracle experiment shows potential gains from 48.8% accuracy (the best single model) all the way up to 67% (best possible ensemble). So it is a trivial exercise to create an ensemble with substantial real gains. Or is it?

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Lisa Alazraki, Lluis Castrejon, Mostafa Dehghani, Fantine Huot, Jasper Uijlings, Thomas Mensink. 2023-12-07. How (not) to ensemble LVLMs for VQA. https://arxiv.org/abs/2310.06641

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