MPPM: A Mobile-Efficient Part Model for Object re-ID

Abstract

Object re-identification (re-ID) is one of the core technologies in Multi-Object Tracking (MOT) that requires real-time decision-making. A Neural Processing Unit (NPU) is a low-power device that is dedicated to deploying neural network-based algorithms and has become one of the most important devices in today's mobile onboard systems. However, the current mainstream re-ID methods rarely consider the NPU characteristics, which makes it difficult for these methods to achieve both high onboard frame rates and high accuracies on an NPU. To address this problem, this paper focuses on designing a re-ID algorithm suitable for NPU deployment. The model of the object re-ID can be divided into two parts: the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">encoder</i> ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">backbone</i> ) and the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">decoder</i> . In this article, a Mobile-efficient Pure Part Model (MPPM) is presented for re-ID task. First, for the <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">backbone</i> of re-ID, we propose an efficient structure GogglesNet, which is composed of traditional convolutions. GogglesNet performs well on the re-ID task and can be comparable to lightweight networks on ImageNet with regard to accuracy and is faster on NPU. We then revisit the architectures of Pure Part Model (PPM) in person re-ID, including PCB and MGN, and propose a mobile-efficient <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">decoder</i> Dual Pattern Network (DPN) for re-ID. The proposed MPPM achieves comparable performance with MGN on five re-ID datasets Market-1501, DukeMTMC-reID, MSMT17, VeRi-776, and VehicleID, while the proposed parameter amount is only 10.2% of it, and the speed on NPU is more than eight times higher.