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Understanding Latent Diffusability via Fisher Geometry
[Submitted on 3 Apr 2026 (v1), last revised 12 Jun 2026 (this ve · 2026-06-16 · via cs.LG updates on arXiv.org

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Abstract:Diffusion models often degrade in latent spaces, yet the formal causes remain poorly understood. We quantify latent-space diffusability via the rate of change of the Minimum Mean Squared Error (MMSE) along the diffusion trajectory. Our framework decomposes this MMSE rate into contributions from Fisher Information (FI) and Fisher Information Rate (FIR). We demonstrate that while global isometry ensures FI alignment, FIR is governed by the interplay between encoder and data geometries. Our analysis decouples diffusion degradation into four penalties: dimensional compression, tangential distortion, high-frequency encoder curvature, and intrinsic data curvature. We derive theoretical conditions for FIR preservation to ensure stable diffusability. Experiments across diverse autoencoding architectures demonstrate the implications of our theoretical bounds. We establish FI and FIR as a comprehensive analytical framework for understanding latent diffusability.

Submission history

From: Jing Gu [view email]
[v1] Fri, 3 Apr 2026 05:52:09 UTC (4,133 KB)
[v2] Fri, 12 Jun 2026 19:45:24 UTC (3,060 KB)