A question about the adversarial loss.

[lhppom]

Thanks for your implement. It quites help me. But I am confused about the adversarial loss. For the Voice conversion task, it aims to convert the voice from A to speaker B's. And the discriminator trains iteratively to measure the current distribution and the target distribution. And why in the implement the adversarial loss compute the distribution distance between A and B but not B and B' ( I denote the G(A, y_b) as B').
Thank you. Look forward to your reply.