Title: HybridNet: Classification and Reconstruction Cooperation for Semi-Supervised Learning,
Abstract: In this paper, we introduce a new model for leveraging unlabeled data to
improve generalization performances of image classifiers: a two-branch
encoder-decoder architecture called HybridNet. The first branch receives
supervision signal and is dedicated to the extraction of invariant
class-related representations. The second branch is fully unsupervised and
dedicated to model information discarded by the first branch to reconstruct
input data. To further support the expected behavior of our model, we propose
an original training objective. It favors stability in the discriminative
branch and complementarity between the learned representations in the two
branches. HybridNet is able to outperform state-of-the-art results on CIFAR-10,
SVHN and STL-10 in various semi-supervised settings. In addition,
visualizations and ablation studies validate our contributions and the behavior
of the model on both CIFAR-10 and STL-10 datasets.