GAPNET: GENERIC-ATTRIBUTE-POSE NETWORK FOR FINE-GRAINED VISUAL CATEGORIZATION USING MULTI-ATTRIBUTE ATTENTION MODULE

This paper proposes a multi-task learning framework for fine-grained visual categorization (FGVC) referred to as Generic-Attribute-Pose Network (GAPNet) that is capable of attending discriminating parts depending on the pose and part-attribute of an object using multi-attribute attention. FGVC is a challenging task that involves categorical data with small inter-class variation and large intra-class varia- tion. Multi-Attribute Attention Module (MAAM) guides the GAPNet to focus on multiple parts of the image feature by emphasizing appropriate feature channels given both pose and part-attribute features. Experiments on Caltech-UCSD Birds and NABirds datasets demonstrate that GAPNet is competitive with other state-of-the-art methods, and ablation study on GAPNet conditioned on pose and part-attribute fea- ture shows that GAPNet performs best when conditioned on both pose and part-attribute features.