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Fine-Grained Dynamic Head for Object Detection

Lin Song · Yanwei Li · Zhengkai Jiang · Zeming Li · Hongbin Sun · Jian Sun · Nanning Zheng

Poster Session 2 #743

Keywords: [ Brain Imaging ] [ Neuroscience and Cognitive Science ] [ Applications -> Computational Biology and Bioinformatics; Applications -> Health; Applications ] [ Time Series Analysis; Neurosc ]


The Feature Pyramid Network (FPN) presents a remarkable approach to alleviate the scale variance in object representation by performing instance-level assignments. Nevertheless, this strategy ignores the distinct characteristics of different sub-regions in an instance. To this end, we propose a fine-grained dynamic head to conditionally select a pixel-level combination of FPN features from different scales for each instance, which further releases the ability of multi-scale feature representation. Moreover, we design a spatial gate with the new activation function to reduce computational complexity dramatically through spatially sparse convolutions. Extensive experiments demonstrate the effectiveness and efficiency of the proposed method on several state-of-the-art detection benchmarks. Code is available at

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