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LoopSpec: Pipelined Self-Speculative Decoding for Looped Transformers

Research Efficiency & Systems

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TL;DR - LoopSpec is a training-free, self-speculative decoding framework that uses intermediate recurrent states in Looped Transformers to draft tokens while pipelining their generation with verification. It delivers up to 6.83Ă— inference speedup on reasoning and coding benchmarks while preserving exact decoding behavior.

  • Generates draft predictions from early recurrent depths without requiring a separate draft model.
  • Overlaps future-token drafting with current-token verification to reduce decoding latency.
  • Selectively adds a second proposal from a deeper recurrent state to improve draft accuracy with limited compute overhead.
  • Supports lossless greedy and sampling-based decoding, with proposal depths derived in closed form and validated empirically.

Sources (1)

LoopSpec: Pipelined Self-Speculative Decoding for Looped Transformers

arXiv cs.LG SangLyul Cho, Langqing Cui, Sehoon Kim, Dongsu Han, Insu Han 2026-09-15 arXiv:2609.17184
Public signals Hugging Face upvotes 1
Providers: Hugging Face · Upvotes 1 OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-09-25 14:19:27.156533 UTC

TL;DR - LoopSpec is a training-free, self-speculative decoding framework that uses intermediate recurrent states in Looped Transformers to draft tokens while pipelining their generation with verification. It delivers up to 6.83Ă— inference speedup on reasoning and coding benchmarks while preserving exact decoding behavior.

  • Generates draft predictions from early recurrent depths without requiring a separate draft model.
  • Overlaps future-token drafting with current-token verification to reduce decoding latency.
  • Selectively adds a second proposal from a deeper recurrent state to improve draft accuracy with limited compute overhead.
  • Supports lossless greedy and sampling-based decoding, with proposal depths derived in closed form and validated empirically.
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