GitLab

Summary:
Before this fix, the EMA GAN model will have inf min_val/max_val when converting QAT models to int8 torchscript model (as shown in f290518237).

https://pxl.cl/1MNx0

Reviewed By: yc-fb

Differential Revision: D23387923

fbshipit-source-id: 5c2119e2c5170e30c6059e7374c22e367fcd2b26