7 Appendix

Friends and family members often visit aPOI together. If the interval is larger than 6 hours, the trajectory will be cut into two clips. Since the outputs from the trajectory forecasting auxiliary task are predicted coordinates (Eq.(9)) instead of probabilities of POIs, it cannot be directly used for predicting the nextPOI. Compared toRNN, DeepMoveis slightly slower due to the introduced attention calculation in the input history trajectory. IfwecompareV1againstV0,itcanbeseenthat incorporating the semantic context is efficient enough (with a marginal cost increment only).