How to get the PSNR of every frame in VSR task in MMagic?

[xjy646]

I'm trying to deploy BasicVSR with REDS dataset and change the model to see what will happen if I use different aligment method but I cant find any way to measure the PSNR of every frame as the original paper did
([1]K. C. K. Chan, X. Wang, K. Yu, C. Dong, and C. C. Loy, “BasicVSR: The Search for Essential Components in Video Super-Resolution and Beyond,” in 2021 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), Nashville, TN, USA, Jun. 2021. doi: 10.1109/cvpr46437.2021.00491.)

I follow the test procedure in
https://github.com/open-mmlab/mmagic/blob/0a560bba9b79ebe78574e1d4cbbdd0e798e63568/configs/basicvsr/README.md
only get average PSNR of every segment ({"REDS4-BIx4-RGB/PSNR": 29.570118925306996, "REDS4-BIx4-RGB/SSIM": 0.8419322136227184, "data_time": 13.38919848203659, "time": 16.937591195106506})

anyone have any idea?