Privacy-Preserving Multimodal Pedestrian Trajectory Predictio Scheme for Large Model Pre-Training

WEI Jian-hao; ZHOU Ting-sen; LI Chuang; WEN Yan-hua; LI Ke-qin

doi:10.12263/DZXB.20250638

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Privacy-Preserving Multimodal Pedestrian Trajectory Predictio Scheme for Large Model Pre-Training

PAPERS | 更新时间：2026-04-24

- Privacy-Preserving Multimodal Pedestrian Trajectory Predictio Scheme for Large Model Pre-Training
- ACTA ELECTRONICA SINICA Vol. 53, Issue 12, Pages: 4376-4393(2025)
- 作者机构：
  
  1.湖南工商大学前沿交叉学院，湖南长沙 410205
  2.湖南工商大学计算机学院，湖南长沙 410205
  3.湖南大学信息科学与工程学院，湖南长沙 410082
  4.纽约州立大学计算机学院，美国纽约 12561
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(62402177);Natural Science Foundation of Hunan Province(2023JJ40237);Outstanding Youth Project of Hunan Provincial Education Department(22B0648);Major Program Project of Xiangjiang Laboratory(23XJ01002;24XJJCYJ01003;22XJ01001)
- DOI：10.12263/DZXB.20250638
  CLC： TP183;
- Received：21 July 2025，
  
  Accepted：01 December 2025，
  
  Published：25 December 2025
- 稿件说明：
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魏建好, 周渟森, 李闯, 等. 面向大模型预训练的多模态行人轨迹预测隐私保护方案[J]. 电子学报, 2025, 53(12): 4376-4393.

WEI Jian-hao, ZHOU Ting-sen, LI Chuang, et al. Privacy-Preserving Multimodal Pedestrian Trajectory Predictio Scheme for Large Model Pre-Training[J]. Acta Electronica Sinica, 2025, 53(12): 4376-4393.
魏建好, 周渟森, 李闯, 等. 面向大模型预训练的多模态行人轨迹预测隐私保护方案[J]. 电子学报, 2025, 53(12): 4376-4393. DOI：10.12263/DZXB.20250638

WEI Jian-hao, ZHOU Ting-sen, LI Chuang, et al. Privacy-Preserving Multimodal Pedestrian Trajectory Predictio Scheme for Large Model Pre-Training[J]. Acta Electronica Sinica, 2025, 53(12): 4376-4393. DOI：10.12263/DZXB.20250638

摘要

在城市级交通大模型应用中，稀疏、异构及强时空关联的多模态行人轨迹数据面临大模型预训练的隐私安全问题.然而，现有大模型隐私保护方法主要关注单一图像、文本或轨迹模态进行隐私保护，忽视了多模态之间在融合空间中的高维相关结构以及梯度中隐含的跨模态语义泄露风险，容易在模型反推或重构攻击下暴露用户真实轨迹模式和行为偏好，难以有效保护多模态融合数据和模型梯度关联性隐私.此外，现有大模型注意力机制主要针对密集数据，难以高效处理稀疏的多模态交通数据，导致模型预测精度不高.因此，本文提出了一种面向大模型预训练的多模态行人轨迹预测隐私保护方案（Privacy-preserving Multimodal Pedestrian Trajectory prediction scheme for Large model pre-training，PMPTL），实现了多模态数据和预训练模型的双重高效保护和高精度预测.具体而言，创新的设计基于Transformer与Mamba相结合的多模态稀疏轨迹流融合方法（Multimodal Sparse trajectory flow fusion method based on a combination of Transformer and Mamba，MSTM），采用Transformer机制对行人轨迹序列进行全局依赖建模，引入Mamba机制降低长序列建模的复杂度，高效融合稀疏时空特征.其次，提出基于分辨率网格划分的自适应加权差分隐私方法（Resolution-aware Grid partitioning-based Adaptive weighted Differential Privacy method，RGADP），根据网格分辨率和网格轨迹特征密度动态分配隐私预算，高可用保护融合特征隐私.接着，提出基于双分支自适应稀疏自注意力机制的多模态特征增强算法（Dual-Branch Adaptive Sparse self-attention mechanism，DBAS），设计双分支自注意力机制，动态调整权重以增强稀疏数据特征表征，确保大模型在稀疏场景下高效表征稀疏轨迹的关键特征，提升预训练效率.同时，采用自适应时空Top-K稀疏化的高效抖动量化隐私保护方法（Adaptive Spatiotemporal Top-K sparsification with Dithering Quantization method，ASDQ），减少梯度冗余，确保大模型预训练安全性.最后，基于自适应加权聚合的多模态稀疏行人轨迹预测优化方法（Adaptive Weighted aggregation-based Multimodal sparse Trajectory prediction method，AWMT），对不同模型参数进行动态加权，平衡隐私保护强度与行人轨迹预测精度，以实现高精度轨迹预测.通过理论分析论证了本文方案满足

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1.43933344

2.28600001

-差分隐私保护.在真实数据集上的实验结果表明，本文方案的预测误差较现有先进方法降低10%，通信效率提升18.43%.

Abstract

Multimodal pedestrian trajectory prediction in city-scale traffic models faces critical challenges including sparse heterogeneous data with strong spatiotemporal correlations and privacy risks during large model pre-training. However

existing privacy-preserving methods for large models predominantly focus on protecting a single modality

such as images

text

or trajectories

while neglecting the high-dimensional correlation structures among modalities in the fusion space and the risk of cross-modal semantic leakage embedded in the gradients. As a result

these methods are vulnerable to model inversion and reconstruction attacks that can expose users’ real trajectory patterns and behavioral preferences

and they fail to effectively protect the privacy of both multimodal fused data and gradient correlations. Moreover

conventional attention mechanisms designed for dense data struggle to efficiently process sparse multimodal traffic features

resulting in suboptimal prediction accuracy. To address these issues

this paper proposes a privacy-preserving multimodal pedestrian trajectory prediction scheme for large model pre-training (PMPTL)

achieving dual-efficient protection for both multimodal data and pre-trained models

along with high-accuracy prediction. Specifically

we design an innovative multimodal sparse trajectory flow fusion method based on a combination of Transformer and Mamba (MSTM)

where the Transformer mechanism models global dependencies in pedestrian trajectory sequences and the Mamba mechanism is introduced to reduce the complexity of long-sequence modeling

thereby enabling efficient fusion of sparse spatiotemporal features. Secondly

we propose a resolution-aware grid partitioning-based adaptive weighted differential privacy (RGADP) method

which dynamically allocates privacy budgets according to grid resolution and the density of grid-level trajectory features

thereby achieving high-utility protection of fused feature privacy. Next

we propose a m

ultimodal feature enhancement algorithm based on a dual-branch adaptive sparse self-attention mechanism (DBAS). By designing a dual-branch self-attention structure that dynamically adjusts weights to strengthen the representation of sparse data features

DBAS enables the large model to efficiently capture key characteristics of sparse trajectories in sparse scenarios and thereby improves pre-training efficiency. Additionally

an adaptive spatiotemporal Top-K sparsification with dithering quantization (ASDQ) method is introduced to reduce gradient redundancy and ensure secure model training. Finally

we propose an adaptive weighted aggregation-based multimodal sparse trajectory prediction framework (AWMT)

which dynamically re-weights different model parameters to balance the strength of privacy protection and the accuracy of pedestrian trajectory prediction

thereby achieving high-precision trajectory forecasting. Theoretical analysis demonstrates that our scheme satisfies

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1.43933344

2.28600001

-DP protection. Experimental results on two real-world datasets show that our scheme reduces prediction error by 10% compared to state-of-the-art approaches and improves communication efficiency by 18.43%.

关键词

Keywords

references

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