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Top1. Introduction
Due to the development of Internet technology, more and more people communicate through the Internet. People gradually establish social relationships between people in the network, which forms a network of social relationships. As a result, social networking service platforms have emerged to serve people to better connect on the network. Early social networking sites quickly emerged, such as Renren.com, the intranet, and quickly networked a large number of users. With the development of social networking, various of social networks emerge. The network is the mapping of people's real life networks., and the way people communicate has presented a new model. Because the network has narrowed the distance between people and even ignored people’s geographical space distance, some people also put forward the concept of global village. Because of the relationship between people in the network, it breaks through the geographical restrictions of people's communication.
There are more and more people using social networks around the world. A new virtual society is forming in the network, and relevant researchers have also proposed a small-world theory. With the rapid development of the Internet, more and more people use the Internet to search and learn information, conduct entertainment activities, and learn online. The Internet has become an indispensable part of people's lives. At the same time, people’s communication methods have also undergone tremendous changes, and they have also facilitated and enriched people’s leisure life and helped people understand the world better (Chen, Chen & Wu, 2016; Van, Pool & Van Paassen, 2017).
In recent years, more and more scholars have used users’ check-in data to study the laws of human movement. When using a location-based social network, the user is more concerned with the person or thing they are interested in. This requires the service system to filter out unrelated people or things, and find out what people with common interests, or help users find out where they may be interested. To achieve these functions, we need to analyze the user's behavior trajectory to find users with similar user behavior trajectories. After exploring what the people are interested or where they may go, they can better serve the users and help people understand the world around them better (Wang, Zhang & Yi, 2017).
A trajectory tracking method of online learning network user location based on neighbor propagation clustering is proposed by X. L et al., (2017). The method simplifies the joint probability data association algorithm by using linear programming adaptive iterative solution for m optimal joint events. On this basis, the distance matrix between the positional trajectories of online learning network users is predicted based on Kalman (Kalman filter) filtering and extrapolation. The association analysis is performed on the online learning network user location trajectory segment based on the neighbor propagation clustering method, and finally the online learning network user location trajectory tracking prediction is implemented according to the association analysis result.
A Markov chain-based trajectory prediction method of online learning network user location is proposed by (Wen, 2017; Liu, Fu & Deng, 2013). Firstly, the ARIMA model (time series model) is integrated to predict the geographic location of the online learning network user at the next moment, and obtain the cumulative retention time prediction value of the user. Then calculate the mean square error between the real value and the predicted value of the online learning network user position, and finally get the accumulated learning time of the online learning network user movement. In addition, the Markov chain principle is integrated to calculate the probability distribution of online learning network users reaching all locations, and the position tracking prediction of online learning network users is realized.