seniorModel Evaluation
What is Fréchet Inception Distance (FID) and how is it evaluated?
Updated May 17, 2026
Short answer
FID measures distance between feature distributions of real and generated images.
Deep explanation
FID computes statistics (mean and covariance) of embeddings extracted from a pretrained Inception network for real and generated images. It assumes embeddings follow a Gaussian distribution and computes Fréchet distance between them. Lower FID indicates better generative quality and diversity.
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