I. Introduction
With the rapid development of society and the increasing improvement of people’s living standards, users have installed a large number of mobile applications (referred to as Apps) on their mobile phones, and one of the important indicators of user experience degree is response speed. Trinh et al [1] collected data on users' use of Apps and concluded that there is a pattern in users' behaviour in using Apps on their mobile phones, so forecast in advance which one users will use next Further, by improving the user experience, the user experience of digital services [2] can be fundamentally improved.