Combining Different V1 Brain Model Variants to Improve Robustness to Image Corruptions in CNNsDownload PDF

12 Oct 2021, 16:13 (modified: 07 Dec 2021, 23:28)SVRHM 2021 PosterReaders: Everyone
Keywords: object recognition, primary visual cortex, biologically-constrained neural network, robustness, common corruptions
TL;DR: We develop robust CNNs using ensembling and distillation techniques that take advantage of biologically-constrained V1 front-ends
Abstract: While some convolutional neural networks (CNNs) have surpassed human visual abilities in object classification, they often struggle to recognize objects in images corrupted with different types of common noise patterns, highlighting a major limitation of this family of models. Recently, it has been shown that simulating a primary visual cortex (V1) at the front of CNNs leads to small improvements in robustness to these image perturbations. In this study, we start with the observation that different variants of the V1 model show gains for specific corruption types. We then build a new model using an ensembling technique, which combines multiple individual models with different V1 front-end variants. The model ensemble leverages the strengths of each individual model, leading to significant improvements in robustness across all corruption categories and outperforming the base model by 38% on average. Finally, we show that using distillation it is possible to partially compress the knowledge in the ensemble model into a single model with a V1 front-end. While the ensembling and distillation techniques used here are hardly biologically-plausible, the results presented here demonstrate that by combining the specific strengths of different neuronal circuits in V1 it is possible to improve the robustness of CNNs for a wide range of perturbations.
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