Deep Clustering via Weighted $k$-Subspace Network
Weitian Huang, Ming Qiang Yin, Jianzhong Li, Shengli Xie · IEEE Signal Processing Letters · 2019
Subspace clustering aims to separate the data into clusters under the hypothesis that the samples within the same cluster will lie in the same low-dimensional subspace. Due to the tough pairwise constraints, k-subspace clustering is sensitive to outliers and initialization. In this letter, we present a novel deep architecture for k-subspace clustering to address this issue, called as Deep Weighted k-Subspace Clustering (DWSC). Specifically, our framework consists of autoencoder and weighted k-subsapce network. We first use the autoencoder to non-linearly compress the samples into the low-dimensional latent space. In the weighted k-subspace network, we feed the latent representation into the assignment network to output soft assignments which represent the probability of data belonging to the according subspace. Subsequently, the optimal k subspaces are identified by minimizing the projection residuals of the latent representations to all subspaces, using the learned soft assignments as a weighting vector. Finally, we jointly optimize the representation learning and clustering in a unified framework. Experimental results show that our approach outperforms the state-of-the-art subspace clustering methods on two benchmark datasets.