API

piqa.utils	Miscellaneous tools and general purpose components
piqa.tv	Total Variation (TV)
piqa.psnr	Peak Signal-to-Noise Ratio (PSNR)
piqa.ssim	Structural Similarity (SSIM) and Multi-Scale Structural Similarity (MS-SSIM)
piqa.lpips	Learned Perceptual Image Patch Similarity (LPIPS)
piqa.gmsd	Gradient Magnitude Similarity Deviation (GMSD) and Multi-Scale Gradient Magnitude Similarity Deviation (MS-GMSD)
piqa.mdsi	Mean Deviation Similarity Index (MDSI)
piqa.haarpsi	Haar Perceptual Similarity Index (HaarPSI)
piqa.vsi	Visual Saliency-based Index (VSI)
piqa.fsim	Feature Similarity (FSIM)
piqa.fid	Fréchet Inception Distance (FID)