融合地点影响力的兴趣点推荐算法

为解决兴趣点（POI）推荐不准确和效率低的问题，深入分析社交因素和地理位置因素的影响，提出了一种融合地点影响力的POI推荐算法。首先，为了解决签到数据稀疏的问题，将2-度好友引入协同过滤算法中构建了社交影响模型，通过计算经历和好友相似度获取2-度好友对用户的社交影响；其次，深入考虑地理位置因素对POI推荐影响，在对社交网络分析的基础上构造了地点影响力模型，通过PageRank算法发现用户影响力，结合POI被签到次数计算地点影响力，获取准确的整体位置偏好，并使用核密度估计方法对用户签到行为建模和获取个性化地理位置特征；最后，融合社交模型和地理位置模型提高推荐准确性，并通过构造POI推荐候选集来提高推荐效率。在Gowalla和Yelp签到数据集上实验，结果表明所提算法能够快速完成POI推荐，在准确率和召回率指标上明显优于融合时间因素的位置推荐（LRT）和融合地理社交因素的个性化位置推荐（iGSLR）算法。

Point-of-Interest recommendation algorithm combining location influence

Focused on the issue that Point-Of-Interest (POI) recommendation has low recommendation accuracy and efficiency, with deep analysis of the influence of social factors and geographical factors in POI recommendation, a POI recommendation algorithm combining location influence was presented. Firstly, in order to solve the sparseness of sign-in data, the 2-degree friends were introduced into the collaborative filtering algorithm to construct a social influence model, and the social influence of the 2-degree friends on the users were obtained by calculating experience and friend similarity. Secondly, by deep consideration of the influence of geographical factors on POI, a location influence model was constructed based on the analysis of social networks. The users' influences were discovered through the PageRank algorithm, and the location influences were calculated by the POI sign-in frequency, obtaining overall geographical preference. Moreover, kernel density estimation method was used to model the users' sign-in behaviors and obtain the personalized geographical features. Finally, the social model and the geographic model were combined to improve the recommendation accuracy, and the recommendation efficiency was improved by constructing the candidate POI recommendation set. Experiments on Gowalla and Yelp sign-in datasets show that the proposed algorithm can quickly recommend POIs for users, and has high accuracy and recall rate than Location Recommendation with Temporal effects (LRT) algorithm and iGSLR (Personalized Geo-Social Location Recommendation) algorithm.