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Title	Spatial-Temporal Contrasting For Fine-Grained Urban Flow Inference
ID_Doc	52510
Authors	Xu X.; Wang Z.; Gao Q.; Zhong T.; Hui B.; Zhou F.; Trajcevski G.
Year	2023
Published	IEEE Transactions on Big Data, 9, 6
DOI	http://dx.doi.org/10.1109/TBDATA.2023.3316471
Abstract	Fine-grained urban flow inference (FUFI) problem aims to infer the fine-grained flow maps from coarse-grained ones, benefiting various smart-city applications by reducing electricity, maintenance, and operation costs. Existing models use techniques from image super-resolution and achieve good performance in FUFI. However, they often rely on supervised learning with a large amount of training data, and often lack generalization capability and face overfitting. We present a new solution: Spatial-Temporal Contrasting for Fine-Grained Urban Flow Inference (STCF). It consists of (i) two pre-training networks for spatial-temporal contrasting between flow maps; and (ii) one coupled fine-tuning network for fusing learned features. By attracting spatial-temporally similar flow maps while distancing dissimilar ones within the representation space, STCF enhances efficiency and performance. Comprehensive experiments on two large-scale, real-world urban flow datasets reveal that STCF reduces inference error by up to 13.5%, requiring significantly fewer data and model parameters than prior arts. © 2023 IEEE.
Author Keywords	Contrastive learning; traffic management; urban computing; urban flow inference

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