在t-SNE的scikit-learn实现中 https://github.com/scikit-learn/scikit-learn/blob/f0ab589f1541b1ca4570177d93fd7979613497e3/sklearn/manifold/_utils.pyx
有人可以解释为什么在第98行中按如下方式计算熵吗？
Date1, Student1, Student2, Student3, Student4, School1, School2, School3, School4, Time1, Time2, Time3, Time4
Date2, Student1, Student2, Student3, Student4, School1, School2, School3, School4, Time1, Time2, Time3, Time4
Date3, Student1, Student2, Student3, Student4, School1, School2, School3, School4, Time1, Time2, Time3, Time4
Date4, Student1, Student2, Student3, Student4, School1, School2, School3, School4, Time1, Time2, Time3, Time4