Revisiting Lossy Verification in Speculative Decoding: Mechanisms, Trade-offs, and Failure Modes

Researchers analyzed lossy verification in speculative decoding and classified existing methods into truncation-based and collaborative approaches.

The study shows that some verification schemes can change the decoding distribution, not just speed up inference.

These distortions may reduce output quality and alter sampling behavior in large language models.

The paper clarifies when lossy verification is safe and when it can seriously harm generation reliability.