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Bi-Semantic Reconstructing Generative Network for Zero-shot Learning

Many recent methods of zero-shot learning (ZSL) attempt to utilize generative model to generate the unseen visual samples from semantic descriptions and random noise. Therefore, the ZSL problem becomes a traditional supervised classification problem. However, most of the existing methods based on the generative model only focus on the quality of synthesized samples at the training stage, and ignore the importance of the zero-shot recognition stage. In this paper, we consider both the above two points and propose a novel approach. Specially, we select the Generative Adversarial Network (GAN) as our generative model. In order to improve the quality of synthesized samples, considering the internal relation of the semantic description in the semantic space as well as the fact that the seen and unseen visual information belong to different domains, we propose a bi-semantic reconstructing (BSR) component which contain two different semantic reconstructing regressors to lead the training of GAN. Since the semantic descriptions are available during the training stage, to further improve the ability of classifier, we combine the visual samples and semantic descriptions to train a classifier. At the recognition stage, we naturally utilize the BSR component to transfer the visual features and semantic descriptions, and concatenate them for classification. Experimental results show that our method outperforms the state of the art on several ZSL benchmark datasets with significant improvements.

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