FID score for MR image reconstruction

To use: python FID_case.py --gpu 0 --batch-size 4 --case-folder '/content/drive/My Drive/0_ResearchWork/recon_MR_GAN/Knee'

To use:

1. install sewar: `pip install sewar'
2. 'python VIF_case.py --case-folder PATH_TO_FOLDER'