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Dynamic Speculation Lookahead Accelerates Speculative Decoding of Large Language Models

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arxiv 2405.04304 v5 pith:GBPHB5LS submitted 2024-05-07 cs.CL

classification cs.CL
keywords lookaheadspeculationdecodingdiscodynamiclanguagelargemodels
verification ladder T0 review T1 audit T2 compute T3 formal
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Speculative decoding is commonly used for reducing the inference latency of large language models. Its effectiveness depends highly on the speculation lookahead (SL)-the number of tokens generated by the draft model at each iteration. In this work we show that the common practice of using the same SL for all iterations (static SL) is suboptimal. We introduce DISCO (DynamIc SpeCulation lookahead Optimization), a novel method for dynamically selecting the SL. Our experiments with four datasets show that DISCO reaches an average speedup of 10% compared to the best static SL baseline, while generating the exact same text.

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Cited by 9 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. TAPS: Target-Aware Prefix Tree Selection for Diffusion-Drafted Speculative Decoding

    cs.AI 2026-05 unverdicted novelty 7.0 of 10

    TAPS converts diffusion marginal probabilities into path-conditioned acceptance estimates to select prefix-closed subtrees under a fixed verification budget, achieving up to 7.9x end-to-end speedup over autoregressive...

  2. Draft Less, Retrieve More: Hybrid Tree Construction for Speculative Decoding

    cs.LG 2026-05 unverdicted novelty 7.0 of 10

    Graft combines pruning and retrieval in a sequential mechanism to build hybrid draft trees for speculative decoding, delivering up to 5.41× speedup and 21.8% better average speedup than EAGLE-3 on large models.

  3. A Sparse Glimpse of the Whole: Train-Free Self-Speculative Decoding

    cs.CL 2026-07 conditional novelty 6.0 of 10

    A training-free self-speculative decoding system with a recallable sparse KV cache and entropy-guided adaptive speculation achieves up to 2.79× speedup while preserving the target distribution.

  4. An Interpretable Latency Model for Speculative Decoding in LLM Serving

    cs.LG 2026-05 unverdicted novelty 6.0 of 10

    The paper presents an interpretable latency model for speculative decoding that infers effective batch size via Little's Law and decomposes demand to predict and explain performance across serving loads, validated on ...

  5. Performance-Driven Policy Optimization for Speculative Decoding with Adaptive Windowing

    cs.CL 2026-05 unverdicted novelty 6.0 of 10

    PPOW uses window-level RL with cost-aware speedup and proximity rewards plus adaptive divergence-aware windowing to reach 6.29-6.52 acceptance lengths and 3.39-4.36x speedups in speculative decoding.

  6. SMART: When is it Actually Worth Expanding a Speculative Tree?

    cs.DC 2026-04 unverdicted novelty 6.0 of 10

    SMART uses marginal benefit-cost analysis to dynamically build efficient speculative trees, achieving 15-20% additional speedup in LLM and MLLM inference.

  7. AdaptiveSD A Stability-Aware, Runtime-Adaptive Speculative Decoding Framework with Multi-Policy Orchestration for CPU-Constrained LLM Inference

    cs.LG 2026-07 conditional novelty 5.5 of 10

    A runtime-adaptive speculative decoder with an 11-rule hierarchy and multi-policy engine keeps wasted draft compute under ~32% and bounds latency variance on CPU-constrained GGUF inference.

  8. AngelSpec: Towards Real-World High Performance Inference with Speculative Decoding

    cs.CL 2026-07 conditional novelty 5.0 of 10

    AngelSpec + DFly pair a chat MTP drafter with a code/math block-diffusion drafter and load-aware verification pruning, reaching up to 2.4x AR throughput on Hy3-A21B.

  9. SMART: When is it Actually Worth Expanding a Speculative Tree?

    cs.DC 2026-04 unverdicted novelty 5.0 of 10

    SMART expands speculative decoding trees only when a node's marginal benefit-cost ratio exceeds current tree-level speedup, claiming ~15–20% extra wall-clock speedup without quality loss.

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