HAda: Hyper-Adaptive Parameter-efficient Learning for Multi-view ConvNets

Recent years have witnessed a great success of multi-view learning empowered by deep ConvNets, leveraging a large number of network parameters. Nevertheless, there is an ongoing consideration regarding the essentiality of all these parameters in multi-view ConvNets. As we know, hypernetworks offer a promising solution to reduce the number of parameters by learning a concise network to generate weights for the larger target network, illustrating the presence of redundant information within network parameters. However, how to leverage hypernetworks for learning parameter-efficient multi-view ConvNets remains underexplored. In this paper, we present a lightweight multi-layer shared Hyper-Adaptive network (HAda), aiming to simultaneously generate adaptive weights for different views and convolutional layers of deep multi-view ConvNets. The adaptability inherent in HAda not only contributes to a substantial reduction in parameter redundancy but also enables the modeling of intricate view-aware and layer-wise information. This capability ensures the maintenance of high performance, ultimately achieving parameter-efficient learning. Specifically, we design a multi-view shared module in HAda to capture information common across views. This module incorporates a shared global gated interpolation strategy, which generates layer-wise gating factors. These factors facilitate adaptive interpolation of global contextual information into the weights. Meanwhile, we put forward a tailored weight-calibrated adapter for each view that facilitates the conveyance of view-specific information. These adapters generate view-adaptive weight scaling calibrators, allowing the selective emphasis of personalized information for each view without introducing excessive parameters. Extensive experiments on six publicly available datasets demonstrate the effectiveness of the proposed method. In particular, HAda can serve as a flexible plug-in strategy to work well with existing multi-view methods for both image classification and image clustering tasks.