Learning Alternating Deep-Layer Cascaded Representation

We propose an alternating deep-layer cascade (A-DLC) architecture for representation learning in the context of image classification. The merits of the proposed model are threefold. First, A-DLC is the first-ever method that alternatively cascades the sparse and collaborative representations using the class-discriminant softmax vector representation at the interface of each cascade section so that the sparsity and collaborativity can simultaneously be considered. Second, A-DLC inherits the hierarchy learning capability that effectively extends the traditional shallow sparse coding to a multi-layer learning model, thus enabling a full exploitation of the inherent latent discriminative information. Third, the simulation results show a significant amelioration in the classification accuracy, compared to earlier one-step single-layer classification algorithms. The Matlab code of this paper is available at https://github.com/chenzhe207/A-DLC.