Parallelize speculative decoding with P-EAGLE on Amazon SageMaker AI | Amazon Web Services
As large language models (LLMs) grow in size and complexity, maximizing inference throughput while minimizing latency remains a critical challenge for enterprise production deployments. Speculative decoding is one effective strategy to address this, utilizing a lightweight draft model to guess future tokens which are then verified by the target LLM in a single forward pass. While state-of-the-art frameworks like Extrapolation Algorithm for Greater Language-model Efficiency (EAGLE) have achieved impressive speedups, they encounter a hidden architectural ceiling: their draft tokens are generated autoregressively. Because each draft token depends on the output of the previous one, producing K candidates requires K sequential forward passes through the draft head, creating a latency cost that grows linearly with speculation depth. EAGLE-3, the latest iteration, improved upon earlier versions by predicting tokens directly rather than features and by combining representations from multiple layers of the target model, boosting draft accuracy and allowing the method to...
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