This is a pytorch implementation of the TrajCL paper:

@inproceedings{chang2023contrastive,
  title={Contrastive Trajectory Similarity Learning with Dual-Feature Attention},
  author={Chang, Yanchuan and Qi, Jianzhong and Liang, Yuxuan and Tanin, Egemen},
  booktitle={2023 IEEE 39th International Conference on Data Engineering (ICDE)},
  pages={2933--2945},
  year={2023},
  organization={IEEE}
}

• Ubuntu 20.04 LTS with Python 3.7.7
• pip install -r requirements.txt
• Datasets can be downloaded from here, and tar -zxvf TrajCL_dataset.tar.gz -C ./data/

To train TrajCL and test it as a standalone trajectory measure (cf. Section V.B in paper):

python train.py --dataset porto

To fine-tune the pre-trained TrajCL to learn to approximate existing heuristic trajectory similarity measures (cf. Section V.F in paper):

(Prerequisites: a pre-trained TrajCL model, in other words, make sure you ran the last command once.)

python train_trajsimi.py --dataset porto --trajsimi_measure_fn_name hausdorff

It may occur failure while installing torch-geometric related packages, including torch-scatter, torch-sparse, torch-cluster and torch-spline-conv, when you use pip install xxx to install them directly. That is a commom issue for the older PyTorch versions. A solution can be found here. Simply speaking, these package need to be installed from wheels. For example, pip install torch-scatter==2.0.7 -f https://pytorch-geometric.com/whl/torch-1.8.1+cu102.html.

To use your own datasets, you may need to create your own pre-processing script like ./utils/preprocessing_porto.py. Also, the MBR of the space is required to fill into config.py. (See ./utils/preprocessing_porto.py and config.py for more details.)

Email [email protected] if you have any queries.