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Fréchet Inception Distance (FID) compares feature statistics from generated and real images using Inception-v3 features.
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A lower value indicates closer estimated feature distributions under the metric, not a complete judgment of image quality.
FID extracts Inception features from real and generated images, approximates each feature distribution as a multivariate Gaussian, and compares the means and covariance matrices. Finite-sample estimates can be biased and protocol-sensitive. Diffusion Models Beat GANs reports ImageNet FID with 50,000 generated samples; that is specific to its benchmark. KID applies a kernel maximum mean discrepancy estimator to Inception features and has an unbiased estimator under its formulation. The original FID work notes that Inception Score does not compare generated features with real-image features. KID uses kernel maximum mean discrepancy over Inception features and has an unbiased finite-sample estimator; it can be useful with smaller samples, while estimates still have uncertainty.
The original FID paper introduced a feature-distribution distance for generative-model evaluation.
Diffusion Models Beat GANs reports ImageNet FID with 50,000 generated samples as its benchmark protocol.
Finite-sample estimators can be biased, so comparisons should match sample counts and preprocessing.
Kernel Inception Distance (KID) uses an MMD estimator over Inception features as an alternative metric.
Alternative metrics include KID and precision/recall-style measures. Evaluate the chosen feature extractor and metric against the target task and human judgments; no single score captures all image quality dimensions.
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Fréchet Inception Distance (FID) compares feature statistics from generated and real images using Inception-v3 features. A lower value indicates closer estimated feature distributions under the metric, not a complete judgment of image quality.
FID mengukur jarak antara taburan ciri sebenar dan terjana, jadi nilai yang lebih rendah bermakna set yang dijana lebih hampir sepadan dengan data sebenar dalam kesetiaan dan kepelbagaian.
FID menghantar imej melalui rangkaian Inception-v3 terlatih dan menggunakan ciri lapisan pengumpulan 2048 dimensi untuk kedua-dua imej sebenar dan terjana.
Setiap set ciri dimodelkan sebagai Gaussian multivariate, dan FID mengira jarak Fréchet (2-Wasserstein) antara dua Gaussian.
Skor Permulaan hanya menilai imej yang dijana secara berasingan; FID menambah baiknya dengan membandingkan secara langsung taburan imej yang dijana dan sebenar.
FID compares both feature means and covariance matrices. Reduced feature diversity can create a covariance mismatch and contribute to a higher distance; it is not a diagnostic guarantee.
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