Why the term about Q(ci) in eqn.(4) in the paper is a constant?

[Tristan-Liu-13]

I don't understand that you have Q(ci) = p(ci;xi, \theta), then why \sigma Q(ci) log Q(ci) is a constant?
Looking forward to your reply.

[Volibear1234]

I have the same question, i can not understand here.