Attention Inspiring Receptive-Fields Network for Learning Invariant Representations.

In this paper, we describe a simple and highly efficient module for image classification, which we term the "Attention Inspiring Receptive-fields" (Air) module. We effectively convert the spatial attention mechanism into a plug-in module. In addition, we reveal the relationship between the spatial attention mechanism and the receptive fields, indicating that the proper use of the spatial attention mechanism can effectively increase the receptive fields of the module, which is able to enhance translation invariance and scale invariance of the network. By integrating the Air module into advanced convolutional neural networks (such as ResNet and ResNeXt), we can construct AirNet architectures for learning invariant representations and gain significant improvements on challenging data sets. We present extensive experiments on CIFAR and ImageNet data sets to verify the effectiveness and feature invariance of the Air module and explore more concise and efficient designs of the proposed module. On ImageNet classification, our AirNet-50 and AirNet-101 (ResNet-50/101 with Air module) achieve 1.69% and 1.50% top-1 accuracy improvement with a small amount of extra computation and parameters compared with the original ResNet. We make models and code public available https://github.com/soeaver/AirNet-PyTorch. We further demonstrate that AirNet has a good ability for transfer learning and measure the performance on Microsoft Common Objects in Context object detection, instance segmentation, and pose estimation.