CaST-POI: Candidate-Conditioned Spatiotemporal Modeling for Next POI Recommendation

CaST-POI is a next‑point‑of‑interest recommender that conditions the user representation on each candidate location by adding bucketised biases for visit recency and geographic distance to the candidate. Unlike prior models that treat all candidates uniformly, CaST-POI lets each candidate read the trajectory with different attention weights grounded in real distance. Experiments on NYC, TKY, and CA datasets show significant MRR gains over seven baselines, with ablation revealing the importance of the revisit gate and spatial bias.

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