Funding for this research was provided by:
National Natural Science Foundation of China (U1808215, 11572063, 11802164)
Fundamental Research Funds for the Central Universities (DUT18ZD103)
Overseas Expertise Introduction Project for Discipline Innovation (B14013)
Article History
Received: 16 February 2020
Revised: 28 August 2020
Accepted: 2 October 2020
First Online: 6 November 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The clustering analysis is simply performed by using the function <i>kmeans</i> in Matlab. All the datasets generated in this work and the Matlab codes are available upon reasonable request to the corresponding author.