Why is L_upper in Eq. (9) implemented as a cross-entropy function?

[tgyy1995]

Thank you for your great work.Not sure if I understand correctly , why is L_upper in Eq. (9) implemented as a cross-entropy function?

[lynlynlyn]

L_upper (Eq. 6) can be considered as adjusting the output logits (by adding a covariance term). Note that the covariance term of the positive term is zero.

[tgyy1995]

I am still a little confused, can you tell me where is the code to calculate the second term of the denominator in Eq. (6)( (z_i)^TAz_i )? Thank you!

[tgyy1995]

I understand, thank you!