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Phase 2 · Engine Core
Speculative Decoding
Free tokens, provably distribution-preserving.
0/4 · 470 XP
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Tasks
min(1, p/q) acceptance + residual resampling. Interviews test whether you can prove exactness.
EAGLE-3 is the shipping default in vLLM/SGLang/TRT-LLM. Also note MTP in DeepSeek-V3 as built-in speculation.
Implement the greedy draft-verify loop (draft k, verify in ONE target call, accept prefix, rollback, bonus token) against the harness's target + noisy draft. Graded on exact equality with pure target decoding and ≥1.5 tokens per verify call.
build+250 XPauto-verifiedAcceptance math, expected tokens/step, when speculation hurts. 75% to pass.
drill+80 XPauto-verified