Mobility Inference on Long-Tailed Sparse Trajectory

Lei Shi, Yuankai Luo, Shuai Ma, Hanghang Tong, Zhetao Li, Xiatian Zhang, Zhiguang Shan

Research output: Contribution to journalArticlepeer-review

Abstract

Analyzing the urban trajectory in cities has become an important topic in data mining. How can we model the human mobility consisting of stay and travel states from the raw trajectory data? How can we infer these mobility states from a single user's trajectory information? How can we further generalize the mobility inference to the real-world trajectory data that span multiple users and are sparsely sampled over time?In this article, based on formal and rigid definitions of the stay/travel mobility, we propose a single trajectory inference algorithm that utilizes a generic long-tailed sparsity pattern in the large-scale trajectory data. The algorithm guarantees a 100% precision in the stay/travel inference with a provable lower bound in the recall metric. Furthermore, we design a transformer-like deep learning architecture on the problem of mobility inference from multiple sparse trajectories. Several adaptations from the standard transformer network structure are introduced, including the singleton design to avoid the negative effect of sparse labels in the decoder side, the customized space-time embedding on features of location records, and the mask apparatus at the output side for loss function correction. Evaluations on three trajectory datasets of 40 million urban users validate the performance guarantees of the proposed inference algorithm and demonstrate the superiority of our deep learning model, in comparison to sequence learning methods in the literature. On extremely sparse trajectories, the deep learning model improves from the single trajectory inference algorithm with more than two times of overall and F1 accuracy. The model also generalizes to large-scale trajectory data from different sources with good scalability.

Original languageEnglish (US)
Article number18
JournalACM Transactions on Intelligent Systems and Technology
Volume14
Issue number1
DOIs
StatePublished - Jan 27 2023

Keywords

  • Urban data
  • trajectory inference
  • transformer

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Artificial Intelligence

Fingerprint

Dive into the research topics of 'Mobility Inference on Long-Tailed Sparse Trajectory'. Together they form a unique fingerprint.

Cite this