Funding for this research was provided by:
National Natural Science Foundation of China (No.61771410)
2016 Key base of tourism and scientific research of Sichuan Provincial Tourism Administration (NO.ZHZ16-02)
2017 Artificial Intelligence Key Laboratory of Sichuan Prov-ince (No.2017RYY05)
2017 Horizontal Project (No. HX2017134)
2015 Teaching Reform Project (No. B11605035)
Postgraduate Innovation Fund Project by Southwest University of Science and Technology (18ycx115)
Article History
First Online: 5 July 2018