Closed-loop speculative-decoding-as-a-service orchestrator -- a self-hosted analog of Fireworks FireOptimizer's adaptive speculative execution. Composes the per-phase skills into one profile-matched loop: profile live traffic (inference-workload-profile) -> hit-rate-matched corpus -> train a draft (inference-spec-decode-train) -> in-engine acceptance + same-node TPOT A/B vs the standing config -> promote ONLY on a measured win (standing config stays otherwise) -> publish. It is Phase 6 of inference-model-optimize run as a profile-matched closed loop instead of one-shot. Defines a service-state.json contract + a --mode oneshot|controller flag so it can later graduate to a deployed in-cluster controller without a rewrite. Triggers on "spec-dec as a service", "adaptive speculative decoding service", "fireoptimizer equivalent", "auto-train a draft", "close the spec-decode loop", "stand up the spec-dec service", or any combination of "service / loop / adaptive" with "spec-decode / speculative / draft".
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SKILL.md
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name
inference-spec-decode-service
last_validated
"2026-06-01T00:00:00.000Z"
description
Closed-loop speculative-decoding-as-a-service orchestrator -- a self-hosted analog of Fireworks FireOptimizer's adaptive speculative execution. Composes the per-phase skills into one profile-matched loop: profile live traffic (inference-workload-profile) -> hit-rate-matched corpus -> train a draft (inference-spec-decode-train) -> in-engine acceptance + same-node TPOT A/B vs the standing config -> promote ONLY on a measured win (standing config stays otherwise) -> publish. It is Phase 6 of inference-model-optimize run as a profile-matched closed loop instead of one-shot. Defines a service-state.json contract + a --mode oneshot|controller flag so it can later graduate to a deployed in-cluster controller without a rewrite. Triggers on "spec-dec as a service", "adaptive speculative decoding service", "fireoptimizer equivalent", "auto-train a draft", "close the spec-decode loop", "stand up the spec-dec service", or any combination of "service / loop / adaptive" with "spec-decode / speculative / draft".
One orchestrator for "give a served model a draft tailored to its OWN traffic, and
keep the standing config unless the tailored draft measurably wins." It does not
re-implement any phase -- it sequences the mature per-phase skills behind a single,
gate-driven, profile-matched loop and one evidence bundle, so an operator drives the
whole profile -> corpus -> train -> A/B -> promote -> publish loop without
hand-stitching skills together.
It is a self-hosted analog of Fireworks FireOptimizer's "adaptive speculative
execution": the differentiator is operational, not algorithmic -- the draft is trained
on a corpus matched to the measured workload profile (the documented source of the
higher draft hit-rate), and it is promoted only on a measured acceptance + TPOT win.
This is the closed-loop framing of
inference-model-optimize Phase 6/7: that
orchestrator trains a draft on a generic corpus one-shot. This one matches the corpus to
traffic and is structured to run repeatedly.
Implementation (v1 oneshot). The loop is driven by specdec-loop.sh, which
EXECUTES C3-C5 behind --i-understand-this-uses-the-cluster (DRY by default), with
companions specdec-decide.py (the variance-controlled GO/NO-GO gate),
canary-arm.yaml (the parameterized experiment-prefixed A/B arm), and specdec-presets.sh. The
Workflow phases below map 1:1 to its C1..C5 + publish. --mode controller (drift-triggered
re-adaptation) remains the v2 seam - see "Mode: controller" below.
When to use
A served model has a latency ceiling you want to beat with a draft tailored to its
actual traffic (not a generic UltraChat+ShareGPT draft).
You want the "spec-dec as a service" capability: profile -> matched draft ->
measured promote, as one workflow.
You are standing up the loop now and want it architected to later become a deployed
controller (continuous re-adaptation to traffic drift).
Do not use this skill for:
A one-shot draft on a generic corpus with no workload profiling -- use
inference-spec-decode-train directly.
The full new-model bring-up (deploy/profile/tune/quantize/...) -- that is
inference-model-optimize. This skill is its
spec-dec sub-loop, made adaptive + repeatable.
deepseek_mtp / ngram / Predicted-Outputs methods -- there is nothing to train
(built-in head / prompt-driven / per-request reference text). Set the config and run
only the acceptance A/B (Phase 4 below).
Example prompts
"Stand up the spec-dec service for GLM-5.1 matched to our AA-shape traffic."
"Auto-train a draft for this model's workload and promote it only if it wins."
"Close the speculative-decoding loop: profile, match, train, A/B, publish."
The skill fails closed if any of these are not satisfied.
A representative traffic sample (OpenAI-style access JSONL) OR a named bench-shape
set (e.g. the inference-aa-workload shapes) to use as the profile.
The target base checkpoint (BF16/FP8 -- NOT the NVFP4 serving copy) staged on a
shared FS/PVC the Slurm trainer can read (the inference-spec-decode-train prereq).
The standing served deploy + its current --speculative-config (the A/B baseline).
Serving-A/B cluster access. The canary runs on EITHER plain K8s
(schedulerName: default-scheduler + nvidia.com/gpu) OR Slurm-on-K8s (the Slurm
schedulerName + the slurm.example.com/lock toleration). The loop
AUTO-DETECTS which (Slurm-on-K8s = a Slurm control plane + the lock taint) and --scheduler default|slurm overrides. For a TRAINED method (eagle3/dflash), also sbatch access to the
SpecForge Slurm trainer (C3 is Slurm-native in BOTH cases). An idle GPU node confirmed BEFORE
any GPU phase (Slurm-on-K8s: pin-node.sh-verified). Training never preempts serving. (The no-train
deepseek_mtp/ngram path needs only the serving cluster.)
For a --mode controller run only: a writable service-state.json location.
Interaction style
Iterative + gate-driven, modeled on
inference-model-optimize: run one phase, report
the gate verdict + the headline number (DRAFT unless promoted), then ask before
advancing. Never auto-advance past a red gate. The operator may start at any phase
(--start-phase) or skip the train phases for a non-trained method.
service-state.json is the graduation seam to a deployed controller: it records the
last profile hash, current champion draft, and last A/B verdict so a future controller
Deployment can decide "has the workload drifted enough to retrain?" without re-deriving
state. Report the scaffolded paths. Ask before any GPU phase.
Phase 1: profile the workload (WS-C1)
Hand off to inference-workload-profile:
emit workload-profile.json (length distributions, content-class mix, ISL/OSL bench
shapes, recommended_spec_decode.method). For an AA-shape profile source, use the
AA-shape adapter (workload-profile.py --aa-shapes ...) so the three AA shapes
(1k/10k/100k) become the profile. Record last_profile_sha256 in service-state.
Gate: a profile with a method recommendation. If the recommendation is
predicted_outputs (rewrite-heavy traffic), skip to Phase 4 with the per-request
prediction path -- there is no draft to train.
Phase 2: build the hit-rate-matched corpus (WS-C2)
Run profile-to-corpus.py (in the inference-workload-profile skill dir): mode (b)
converts a redacted traffic JSONL directly to the SpecForge conversations schema,
mode (a) emits a weighted prepare_data.py plan matched to the content-class mix +
length distribution. The corpus is the DATA_PATH for the trainer. Gate: a corpus that
renders cleanly through the target chat template (a bad loss-mask shows up as
training loss stuck at zero).
Phase 3: train the matched draft (WS-C3)
Hand off to inference-spec-decode-train
with the Phase-2 corpus as DATA_PATH. The capture-correctness probe
(--probe-logits) MUST pass before any full re-capture/retrain -- a broken
hidden-state capture trains a head that serves at ~0% acceptance and wastes days
of GPU time. Submit-and-queue on idle Slurm nodes. Never babysit, never preempt serving.
Gate: non-degenerate training acc_0 / loss.
Phase 4: acceptance + TPOT A/B (WS-C4, the gate that matters)
Serve the trained draft via --speculative-config on an experiment-prefixed canary and
measure in-engine acceptance (dflash_vllm_eval.py + vLLM spec_decode_*
counters) on a same-node A/B vs the standing config, under cudagraph, >=3
trials (DRAFT->VERDICT). Gate: an acceptance-length win AND a median-TPOT win. A draft
that loses is do-not-ship. Record last_ab_verdict.
Phase 5: promote on a win (WS-C5) + publish
On a measured win, flip the experiment-prefixed canary's --speculative-config
(specdec-presets.sh renders the line). Set champion_draft in service-state. On a
loss, keep the standing config and report why. Either way, publish the campaign:
perf_tune_report_campaign_init --experiment-id <run-id> --focus latency ->
cell_run (at the profile's bench_shapes) -> atlas_aggregate ->
dcgm_correlate (raises sol_rigor to L3) -> report_render -> publish_to_lake.
Record campaign=<id> + s3://perf-lake/... in SOURCE.md/summary.md.
Mode: controller (graduation seam -- NOT v1)
--mode controller is a documented stub for the deployed-service evolution: a
long-running loop that periodically re-profiles live traffic, compares
last_profile_sha256 to detect drift, retrains + re-A/Bs on drift, and auto-promotes on
a win -- plus the dynamic runtime fallback (disable spec-dec when the live
spec_decode_* acceptance drops). v1 implements only oneshot, controller reuses
Phases 1-5 verbatim driven by a controller Deployment reading/writing
service-state.json. Implementing the Deployment + fallback engine policy is the
separate "(b) deployed controller" track.
Verdict rigor (DRAFT vs VERDICT)
Training acc_0 is a training-time signal, not a serve verdict. The promote/no-promote
claim is the Phase-4 serve acceptance + TPOT A/B: DRAFT unless same-node + >=3 trials +
metric-isolated (median TPOT/ITL) + matching cudagraph_mode + a
production-representative baseline (the standing config, e.g. MTP K=3 -- never an eager
strawman). The Phase-5 campaign publishes with the honest verdict_tier.
Safety
Scheduling (plain K8s OR Slurm-on-K8s) -- the serving canary is rendered for whichever the loop
detects (override with --scheduler default|slurm): plain K8s uses default-scheduler +
nvidia.com/gpu. Slurm-on-K8s uses the Slurm schedulerName + the slurm.example.com/lock
toleration, same-node-pinned to a pin-node.sh-verified-idle node (a bare nodeSelector to a
non-idle node loops on NodeAffinity under the Slurm scheduler). TRAINED-method Slurm jobs
(eagle3/dflash) submit-and-queue and never preempt serving. Preflight an idle node first.
Standing config stays until a measured win -- the served --speculative-config
is not changed until the Phase-4 A/B shows a real acceptance + TPOT win under cudagraph.
Capture-correctness gate -- never launch a full re-capture/retrain until the
--probe-logits probe passes. A broken capture costs days of wasted training.
Experiment isolation -- canary + draft-staging objects experiment-prefixed +
experiment=<id-slug>. Teardown by label, PV last. Never touch standing deploy names.
Local/fork only -- no upstream PR / external posting without explicit per-turn
operator approval.
Per the methodology canon "Every performance number carries its full context (no bare
numbers)" (docs/METHODOLOGY.md, "Full-context reporting"): every number this
skill emits MUST carry its full measurement-context descriptor, and every comparison MUST be
matched on it. A bare tok/s / TPOT / BW / %SoL / speedup is a defect - it cannot set a
default, ship a config, or appear in a report.
Grounding:%SoL (+ ceiling key from configs/sol-ceilings.yaml - never inline a peak), sol_rigor (L1-L4), trials n (mean±std), same-node, baseline named.
Per-number exact shape (no smoothing): when reporting more than one number, keep EACH with its own exact shape (ISL/OSL, concurrency, dataset, regime) - never normalize a set to one uniform descriptor that hides per-point variation (e.g. c=1 @ ISL1024/OSL256 + c=64 @ ISL4096/OSL512, NOT one shared "random").
If this skill produces a measurement (tok/s, latency, %SoL, speedup), follow the
rigor discipline: capture L1 zymtrace + L3 DCGM (L4 ncu where feasible)
Speed-of-Light and publish --strict. Canonical map: docs/METHODOLOGY.md. Skills that
do not produce measurements are exempt (docs/METHODOLOGY.md "Speed-of-light framing").
Next lever / BREAKTHROUGH (Grind Mandate)
If this skill emits a measured result, its output MUST end by naming the next perf lever,
its expected unlock (direction + rough magnitude), and the gate that proves/refutes it,
per the Grind Mandate (docs/METHODOLOGY.md, "Always be grinding"). A
measured win is the new floor, not the finish -- so do everything we can to find the next
BREAKTHROUGH: the highest-EV unlock toward Speed-of-Light (a new champion / kernel / router /
quant / parallelism / spec-decode win, or an unblocked stack), not just the next micro-lever.
Rank the candidate breakthrough levers by value x cost (the GRIND FRONTIER, perftunereport value_view), pursue the top, bank the rest with evidence. Record WHY a refuted lever loses,
update the standing frontier in the active bundle's HANDOFF.md. Never conclude
"exhausted/optimal/done" without an explicit next-lever frontier (an empty frontier AND a
documented SoL wall only). Delete this section ONLY if the skill produces no measurements.
