V4D:4D Convolutional Neural Networks for Video-level Representation Learning

• URL: http://arxiv.org/abs/2002.07442v1
• Date: Tue, 18 Feb 2020 09:27:41 GMT
• Title: V4D:4D Convolutional Neural Networks for Video-level Representation Learning
• Authors: Shiwen Zhang and Sheng Guo and Weilin Huang and Matthew R. Scott and Limin Wang
• Abstract summary: Most 3D CNNs for video representation learning are clip-based, and thus do not consider video-temporal evolution of features. We propose Video-level 4D Conal Neural Networks, or V4D, to model long-range representation with 4D convolutions. V4D achieves excellent results, surpassing recent 3D CNNs by a large margin.
• Score: 58.548331848942865
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Most existing 3D CNNs for video representation learning are clip-based methods, and thus do not consider video-level temporal evolution of spatio-temporal features. In this paper, we propose Video-level 4D Convolutional Neural Networks, referred as V4D, to model the evolution of long-range spatio-temporal representation with 4D convolutions, and at the same time, to preserve strong 3D spatio-temporal representation with residual connections. Specifically, we design a new 4D residual block able to capture inter-clip interactions, which could enhance the representation power of the original clip-level 3D CNNs. The 4D residual blocks can be easily integrated into the existing 3D CNNs to perform long-range modeling hierarchically. We further introduce the training and inference methods for the proposed V4D. Extensive experiments are conducted on three video recognition benchmarks, where V4D achieves excellent results, surpassing recent 3D CNNs by a large margin.

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