Research Article
Location-Aware POI Recommendation for Indoor Space by Exploiting WiFi Logs
Algorithm 2
The proposed two-stage approach for indoor POI recommendation.
Require: () User set , POI set , and user’s indoor spatial-temporal | trajectory ; () Target user | Ensure: POI recommendation list of user . | () Stage 1: Relation graph construction and inference. | () for do | () Calculate initial User-POI relation strength according to Equation (4); | () Calculate initial User-User relation strength according to Equation (5); | () end for | () Construct relation graph ; | () Obtain transition probability matrix according to Equation (9); | () Perform random walk with start over to infer User-User relation; | () Stage 2: POI online recommendation | () Obtain the unvisited POIs set of target user | () for do | () Calculate User-POI relation strength according to Equation (10). | () end for | () Rank according to . | () return Select top-K POIs as the recommendation list of . |
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