Staged Bottleneck Localization in Compressed Text Generation
July 26, 2026
A study using a hierarchical VQ-VAE-2 and masked discrete diffusion generator (MDLM) isolates failures in short-text compression. Findings show that codec reconstruction alone can increase median external perplexity from 15.17 to 27.36, identifying the codec as a primary quality bottleneck.
HOW THIS AFFECTS YOU
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builderUse staged validation to determine if your generation quality issues stem from the codec or the latent generator.
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researcherThis provides a controlled framework for decoupling reconstruction fidelity from semantic generation quality.