test(checkpoint): expand parity metrics and phase coverage by yuhezhang-ai · Pull Request #3567 · NVIDIA-NeMo/Automodel

yuhezhang-ai · 2026-08-17T20:34:36Z

What does this PR do?

Expand checkpoint-robustness coverage and replace per-model max-KL tuning with stable, profile-based full-logit metrics.

Changelog

Make phases 0-4 and process isolation the default for enabled LLM/VLM checkpoint-robustness tests; keep cross-TP as optional phase 5.
Stop writing an unused final distributed checkpoint after Phase 4 has restored state and completed its validation trajectory.
Clarify the lifecycle: source parity, train/save/reference, AutoModel reload, HF export reload, native resume, and optional cross-TP.
Add bounded-memory mean, p95, and max KL; cosine similarity; and mean/max absolute logit-difference reporting.
Gate mean KL, p95 KL, and cosine with strict, standard, and relaxed profiles. Keep one optional structured parity_threshold_overrides mapping for measured exceptions across source_load, automodel_reload, hf_reload, and cross_tp; omitted metrics inherit the selected profile. Step uses only its AutoModel-reload mean/cosine entries. Max KL remains diagnostic and is not overridable.
Run each loaded HF reference twice and report hf_source_self_repeat / hf_export_self_repeat, so an unstable reference is distinguishable from cross-framework drift.
Keep phase load/forward smoke and metrics available when only a proven-unreliable numerical gate is informational (skip_source_load_logit_parity, skip_automodel_reload_logit_parity, skip_hf_reload_logit_parity).
Use a frozen, SHA-256-protected 6,000+ word document; tokenize 2,048 unique long-form tokens by default and support configurable 1K-4K lengths without repetition.
Resize PP stage activation buffers to the configured parity length.
Fix source-path resolution and consolidated-reload retargeting for config-based recipes.
Make an explicit trust_remote_code: false override a recipe default of true.
Support a documented per-config HF-reload waiter timeout for very large CPU-offloaded references.
Remove legacy max-KL and flat numeric threshold fields after migrating live recipes to profiles plus the optional structured override mapping.
Migrate retrieval checkpoint robustness to the shared standard profile and default-on HF reload/native-resume phases; structured cosine overrides remain available only if a measured exception appears.
Add first-time checkpoint-robustness coverage for DeepSeek-V4-Flash, Qwen3.8-27B, Kimi-Linear-48B-A3B, and GLM-4.7-Flash.
Add unit coverage and checkpoint-robustness configuration documentation.
Make shared-trajectory runs guarantee enough epochs to reach their checkpoint boundary and continuation while suppressing unrelated epoch-boundary saves.
Export Nemotron-H PEFT weights and target-module metadata through the checkpoint's remote-code backbone.* or native Transformers model.* namespace.

Phase contract

Phase	Name	What it loads or does	Required metric/check
0	Source load	Load the original HF checkpoint with vanilla HF and AutoModel.	Full-logit mean KL, p95 KL, and cosine; tied-weight checks.
1	Train/save reference	Train AutoModel; save the consolidated HF checkpoint and native DCP checkpoint; capture reference logits.	Training/save succeeds; reference logits and resume artifacts are finite and complete.
2	AutoModel reload	A new AutoModel process loads the consolidated HF checkpoint. PEFT reloads the AutoModel model/adapter checkpoint.	Full-logit mean KL, p95 KL, and cosine against Phase 1; exact PEFT trainable-weight fingerprints.
3	HF reload	Vanilla HF loads the consolidated HF checkpoint. PEFT loads the exported adapter.	Full-logit mean KL, p95 KL, and cosine against Phase 1; exact adapter fingerprints.
4	Native resume	Load the native DCP checkpoint, including model, optimizer, scheduler, RNG, and data position, then resume training for three additional optimizer steps on the same batches as the uninterrupted run.	Exact scheduler/RNG/optimizer metadata and first-pre-update per-rank model/optimizer tensors; identical batch and LR; loss within the resume profile for all three steps.
5	Cross-TP reload	AutoModel with a different TP size loads the consolidated HF checkpoint.	Full-logit mean KL, p95 KL, and cosine against Phase 1.

Config controls: Phase 0 — skip_source_load_parity, skip_source_load_logit_parity; Phase 2 — skip_automodel_reload_logit_parity; Phase 3 — skip_hf_reload, skip_hf_reload_logit_parity; Phase 4 — skip_resume; Phase 5 — cross_tp_size.

Phases 0-4 are the default core coverage. A phase is skipped only for a documented capability/reference limitation; an observed mismatch alone remains blocking.

Numerical profiles

Profile	Same implementation mean / p95 / cosine	Cross-topology mean / p95 / cosine	Cross-framework mean / p95 / cosine
`strict`	`1e-7` / `1e-6` / `0.999999`	`1e-6` / `1e-5` / `0.99999`	`1e-4` / `1e-3` / `0.9999`
`standard` (default)	`3e-3` / `1.2e-2` / `0.999`	`6e-3` / `3e-2` / `0.998`	`6e-3` / `3e-2` / `0.998`
`relaxed`	`2e-2` / `5e-2` / `0.995`	`2e-2` / `5e-2` / `0.995`	`2.5e-2` / `1e-1` / `0.99`

The ordering is monotonic: changing topology is never stricter than the same implementation. standard is the default for dense and stable-MoE paths, while relaxed is reserved for measured distributed or low-precision drift. Neither model size nor TP/PP alone justifies a looser profile. A measured exception uses parity_threshold_overrides for only the exceeded gate(s), with every unspecified profile gate retained.

Max KL remains diagnostic because sparse outliers can be large while distribution-level metrics remain stable; for example, Qwen3-MoE HF reload reached max KL 1.406 with mean/p95 0.00228 / 0.00597 and cosine 0.99879.

Scoped-CI calibration

Settled-head 20-job calibration: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63229114
Latest Step3.7 resume validation: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63229651
Final-profile 20-job rerun: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63311388

Earlier 20-model calibration established the profile boundaries and kept unexplained correctness/load failures blocking. The rebased active-LLM repair cohort 63498589 then completed 23 jobs: 15 passed and 8 failed for classified reasons. Follow-up pipeline 63504152 passed all four GPT-OSS Customizer variants and both Nemotron Flash variants without skipping a phase or changing a profile definition; pipeline 63510378 passed the repaired Nano 4B PEFT export reload.

Final routed-MoE regression pipeline 63512263 ran eight exact jobs from SHA f041b88e733f9d8162b3387348371d705304e7d5: all four GPT-OSS variants, Qwen3 MoE, Nemotron Nano Customizer full SFT, and Nano 4B PEFT passed. The Nemotron chat variant restored model/buffers/optimizer/scheduler/RNG exactly and passed steps 5-6, but its step-7 loss differed by 0.021995 (0.497%) versus the standard 0.013853 allowance. Its non-chat sibling passed standard with 0.000277 step-7 drift.

The existing relaxed resume profile allows 0.043201 for the measured chat loss, so final SHA 10812cb4102322dac731c55e25142e80cfe75593 selects it only for that routed hybrid-MoE chat config. Logit gates remain standard, no numeric override or skip was added, and the non-chat sibling remains standard. Exact one-job pipeline 63517674 passed all phases. Its step-7 drift was 0.005666, smaller than the calibration run and well inside the shared profile; exact restored state passed again.

Current decisions

Model	Profile / gate decision	Current outcome or follow-up
Qwen3 MoE 30B LoRA	`standard`	Clean source/reloads and exact resume state.
Nemotron Super V3 PEFT	`relaxed`; resume re-enabled	Distributed reload/resume drift is inside the shared relaxed envelopes; legacy max override removed.
MiniMax M2.7 LoRA	Failed — blocking	Very large HF mismatch and later resume drift (AMINT-286).
GPT-OSS 20B PEFT	`relaxed`; resume enabled	Final-head source/reloads pass; restored state and all three continuation losses pass, with PEFT and packing trajectories bitwise exact.
DeepSeek V4 Flash	`relaxed`; failed — blocking	AutoModel reload fits relaxed; HF `layer_types` load failure and 40 resume-buffer mismatches remain under AM-202.
Qwen3 MoE 30B TE/DeepEP	`standard`; resume re-enabled	Clean mean/p95/cosine; legacy source/HF max overrides removed.
Nemotron Flash 1B	`standard` logits, relaxed resume	Full and PEFT variants pass source, AutoModel reload, repaired vanilla-HF export reload, and native resume.
Nemotron Nano V3	`standard`	Rebased-head checkpoint-robustness job passes after the bounded timeout increase.
Nemotron Nano Customizer	`standard` logits; chat-only `relaxed` resume	Non-chat passes standard; chat restores exact state and only its measured third continuation loss needs the shared routed-MoE envelope.
Nemotron Nano 4B PEFT	`standard`; documented Mamba resume skip	Repaired remote-code PEFT export passes source, AutoModel reload, and vanilla-HF reload on the final harness SHA.
Nemotron Nano 9B PEFT	Failed — blocking	TP2 exact PEFT reload changes replicated Mamba LoRA state on TP-rank 1; AMINT-291. No skip or threshold workaround.
Llama 3.2 1B	`standard`	Source, reloads, cross-TP, and resume fit.
Customizer Llama 3.1 8B TP	`standard`; no resume skip	Current-main rerun passes all phases: restored state, gradients, and post-step state match exactly; AMINT-289 closed as no longer reproducible.
Kimi Linear 48B-A3B	Failed — blocking	AM reload/resume fit; the remote Transformers `OutputRecorder` import failure is tracked by AMINT-288.
GPT-OSS 20B	`standard`	Rebased-head checkpoint-robustness job passes after the bounded timeout increase.
GLM 4.7 Flash	Failed — blocking	Large, repeatable HF mismatch (AMINT-287).
ERNIE 4.5 21B-A3B	`standard`	Legacy max-only failure; distribution metrics and resume fit.
Step3.7 200B	`relaxed` + Phase 2 mean `0.04` / cosine `0.99`; only HF gates informational	AutoModel reload and native-resume gates remain enforced; only the repeatable Phase 2 routed-MoE mean/cosine need targeted overrides, while relaxed p95 stays active. Final-head rerun awaits 8-node capacity.
Qwen3.8 27B	`standard`	Cross-framework comparisons and resume fit; HF source self-repeat anomaly remains visible.
Qwen3.5 35B-A3B	`standard`	Comparisons and resume fit; HF export self-repeat anomaly remains visible.
Qwen3-VL MoE 30B	`standard`	Source, both reloads, and resume fit.
Mistral4	`relaxed`	Clean BF16 HF-export drift anchors the relaxed cross-framework profile.
Gemma4 26B-A4B	only HF gates informational	AutoModel reload and native resume are bitwise exact and remain enforced; HF source/export are demonstrably non-repeatable.

Final routed-MoE regression metrics

Each parity cell is mean / p95 / max KL; cosine. Resume is the absolute loss difference at steps 5/6/7. The chat row records the calibration run; its independent final-SHA rerun passed with resume differences 0.002103 / 0.000127 / 0.005666.

Job	Source HF → AM	AutoModel reload	HF export reload	Resume loss differences
GPT-OSS full	`.007554/.028003/.554645; .999144`	`0/0/0; 1`	`.008223/.034005/.790934; .999154`	`0/.002969/.002026`
GPT-OSS full chat	`.007554/.028003/.554645; .999144`	`0/0/0; 1`	`.005849/.016791/1.754057; .999422`	`0/.004654/.002209`
GPT-OSS PEFT	`.005401/.019350/.611482; .999410`	`0/0/0; 1`	`.007292/.021927/2.030980; .999182`	`0/0/0`
GPT-OSS PEFT packing	`.006386/.018244/.862887; .999233`	`0/0/0; 1`	`.006193/.022491/.814642; .999356`	`0/0/0`
Nemotron Customizer full	`.002541/.010453/.239663; .999287`	`.002245/.008229/.080814; .999355`	`.002588/.009124/.249942; .999291`	`.001315/.001557/.000277`
Nemotron Customizer chat	`.002594/.010720/.232123; .999278`	`.000576/.002029/.030139; .999849`	`.002881/.011180/.305111; .999207`	`.001347/.003246/.021995`
Qwen3 MoE	`.002598/.009486/.271365; .998172`	`0/0/0; 1`	`.001871/.005224/.662879; .999021`	`0/0/0`
Nano 4B PEFT	`.000459/.001849/.009560; .999925`	`.000495/.001915/.010723; .999923`	`.000500/.001897/.006943; .999922`	documented Mamba skip

Outstanding model issues

AMINT-286: MiniMax M2.7 catastrophic HF parity and later resume drift.
AMINT-287: GLM-4.7-Flash cross-framework parity.
AMINT-288: Kimi Linear / Transformers OutputRecorder compatibility.
AMINT-289 (resolved): the prior Customizer Llama optimizer mismatch no longer reproduces on current main; fresh Phase 4 diagnostics are exact.
AM-202: DeepSeek V4 evidence updated with missing layer_types and 40 router-buffer mismatches.
AMINT-290 (low-priority CI follow-up): wrappers can remain running while Slurm accounting is temporarily unavailable, delaying propagation of terminal job state.
AMINT-291: Nano 9B TP2 PEFT reload changes replicated Mamba LoRA state on TP-rank 1.

Full 20-model metric table

Each comparison cell is mean / p95 / max KL; c cosine; d mean / max absolute logit difference. 0 means bitwise-identical logits. Metrics are from pipeline 63229114 except the marked Step source/AM/resume values, which use the newer pipeline 63229651.

Model	HF source self	Source HF → AM	AM reload	HF export self	HF export → AM	Resume
Qwen3 MoE LoRA	`0; c 1; d 0`	`.002598/.009486/.2714; c .99817; d .1293/8.805`	`0; c 1; d 0`	`0; c 1; d 0`	`.001649/.005984/.03904; c .99905; d .08808/8.906`	`0; state exact`
Nemotron Super V3 PEFT	`0; c 1; d 0`	`.005637/.029114/.06446; c .99987; d .2813/16.5`	`0; c 1; d 0`	`0; c 1; d 0`	`.005842/.028533/.08861; c .99986; d .2889/13.25`	`not run; now enabled`
MiniMax M2.7 LoRA	`0; c 1; d 0`	`13.139/22.326/36.013; c .02378; d 4.132/41.5`	`0; c 1; d 0`	`0; c 1; d 0`	`6.248/11.409/18.178; c .01950; d 4.167/43.03`	`.003000; state exact`
GPT-OSS 20B PEFT	`0; c 1; d 0`	`.005909/.019362/1.368; c .99933; d .08169/14.0`	`.006648/.022910/.8930; c .99930; d .08942/7.398`	`0; c 1; d 0`	`.007906/.021799/1.482; c .99910; d .09503/17.69`	`not run; now enabled`
DeepSeek V4 Flash	`—; HF load failed`	`—; HF load failed`	`.005166/.021667/.3463; c .99816; d .2250/15.44`	`—`	`—; HF load failed`	`.00431; params/optimizer exact; 40 buffers differ`
Qwen3 MoE TE/DeepEP	`0; c 1; d 0`	`.002598/.009486/.2714; c .99817; d .1293/8.805`	`0; c 1; d 0`	`0; c 1; d 0`	`.002278/.005972/1.406; c .99879; d .08868/15.52`	`not run; now enabled`
Nemotron Flash 1B	`0; c 1; d 0`	`.000861/.002358/.00789; c .99990; d .03762/.4375`	`.001095/.003079/.00973; c .99987; d .04348/.5313`	`—; unsupported HF reload`	`—; unsupported HF reload`	`.008243; state exact`
Nemotron Nano V3	`0; c 1; d 0`	`.002570/.010360/.1663; c .99924; d .08407/6.236`	`—; timeout`	`—; timeout`	`—; timeout`	`—; timeout`
Llama 3.2 1B	`0; c 1; d 0`	`.000542/.001872/.01721; c .99990; d .02540/.9766`	`0; c 1; d 0`	`0; c 1; d 0`	`.000515/.001794/.01643; c .99990; d .02484/1.25`	`.000627; state exact`
Customizer Llama 3.1 8B TP	`0; c 1; d 0`	`.000584/.001993/.00969; c .99984; d .02947/1.531`	`.000518/.001898/.01021; c .99984; d .02802/3.25`	`0; c 1; d 0`	`.000565/.001947/.02115; c .99983; d .02932/1.844`	`steps 5-6 exact; step 7 .001261; all restored/gradient/post-step digests exact`
Kimi Linear 48B-A3B	`—; remote import failed`	`—; remote import failed`	`.002363/.009074/.06528; c .99934; d .09521/8.652`	`—; remote import failed`	`—; remote import failed`	`.000847; state exact`
GPT-OSS 20B	`0; c 1; d 0`	`.004814/.016797/.5545; c .99944; d .08023/12.88`	`—; timeout`	`—; timeout`	`—; timeout`	`—; timeout`
GLM 4.7 Flash	`0; c 1; d 0`	`.2909/.6578/30.334; c .97475; d 4.668/234`	`0; c 1; d 0`	`0; c 1; d 0`	`.05680/.04250/18.737; c .99818; d 2.539/76`	`0; state exact`
ERNIE 4.5 21B-A3B	`0; c 1; d 0`	`.000957/.003744/.07851; c .99967; d .05159/9.156`	`0; c 1; d 0`	`0; c 1; d 0`	`.000913/.003166/.1424; c .99976; d .04806/4.281`	`.003327; state exact`
Step3.7 200B	`1.892/5.616/17.622; c .76583; d 1.407/21.46`*	`2.599/13.498/39.303; c .80205; d 1.308/42.66`*	`.004473/.012207/.9024; c .99579; d .1383/15.63`*	`1.948/4.726/14.480; c .80724; d 1.188/26.63`	`.7678/2.704/23.179; c .85263; d 1.109/32.81`	`.006711; pre-state and first forward exact`*
Qwen3.8 27B	`.04461/.16181/5.390; c .98238; d .3101/14.31`	`.000498/.001997/.01446; c .99922; d .03549/11.82`	`0; c 1; d 0`	`0; c 1; d 0`	`.000472/.001946/.01296; c .99937; d .03363/11.05`	`.000460; state exact`
Qwen3.5 35B-A3B	`0; c 1; d 0`	`.002063/.007866/.09401; c .99854; d .08786/7.891`	`0; c 1; d 0`	`.05982/.23924/6.741; c .98483; d .3052/12.16`	`.001870/.007141/.1011; c .99832; d .08810/10.66`	`.000761; state exact`
Qwen3-VL MoE 30B	`0; c 1; d 0`	`.002077/.007950/.2456; c .99870; d .1019/9.633`	`.001397/.004856/.1208; c .99928; d .06816/6.188`	`0; c 1; d 0`	`.001393/.004739/.1531; c .99919; d .07135/8.188`	`.000554; state exact`
Mistral4	`0; c 1; d 0`	`.003163/.011946/.6453; c .99851; d .1272/11.0`	`.001104/.004206/.03141; c .99943; d .07178/13.31`	`0; c 1; d 0`	`.02053/.08288/1.519; c .99223; d .3168/15.15`	`.000414; state exact`
Gemma4 26B-A4B	`11.133/19.072/27.995; c .46537; d 5.931/43.13`	`11.846/19.370/28.673; c .45972; d 5.936/44.63`	`0; c 1; d 0`	`.5665/2.322/10.673; c .86457; d 2.477/27.94`	`.07024/.29182/5.345; c .98810; d .6554/22.17`	`0; state exact`

Step3.7 and Gemma4 HF-reference evidence

Model / comparison	Mean / p95 / max KL	Cosine	Mean / max abs logit diff	Interpretation
Step HF source self-repeat	`1.892 / 5.616 / 17.622`	`0.76583`	`1.407 / 21.46`	HF differs materially from itself in the same loaded reference.
Step source HF → AM	`2.599 / 13.498 / 39.303`	`0.80205`	`1.308 / 42.66`	Cross-framework gap is the same order as HF self-repeat.
Step AM reload	`0.004473 / 0.012207 / 0.9024`	`0.99579`	`0.1383 / 15.63`	Fits relaxed and remains blocking.
Step HF export self-repeat	`1.948 / 4.726 / 14.480`	`0.80724`	`1.188 / 26.63`	Exported HF reference is also non-repeatable.
Gemma HF source self-repeat	`11.133 / 19.072 / 27.995`	`0.46537`	`5.931 / 43.13`	HF source is highly non-repeatable at 2K.
Gemma source HF → AM	`11.846 / 19.370 / 28.673`	`0.45972`	`5.936 / 44.63`	Cross-framework gap closely tracks HF self-repeat.
Gemma AM reload	`0`	`1`	`0`	AutoModel reload is bitwise exact and remains blocking.
Gemma HF export self-repeat	`0.5665 / 2.322 / 10.673`	`0.86457`	`2.477 / 27.94`	Reloaded HF reference remains non-repeatable.

Stable Qwen/ERNIE MoE controls show that MoE/EP/PP alone does not justify a relaxed or skipped gate. Therefore only Step/Gemma's HF-based numerical gates are informational. Their AutoModel reload and native-resume checks remain active. Nemotron Flash's HF export reload is now enabled and passes after applying the same pre-v5 remote-code compatibility setup used for source load.

Validation

204 focused checkpoint-harness, config-resolver, and CI-generator tests pass after the structured-override migration.
All 506 example YAML files linted clean before the schema migration; the changed Step and retrieval recipes lint clean on the final head.
ruff format --check, ruff check, and git diff --check pass.
Every commit is DCO-signed; final-head PR checks are retriggered on the exact SHA below.
Earlier exact 20-model profile calibration: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63311388
Rebased 23-job active-LLM cohort: 15 pass, 8 classified failures: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63498589
GPT-OSS/Nemotron Flash repair cohort: 6/6 pass: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63504152
Nano 4B PEFT namespace repair: pass: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63510378
Final routed-MoE/Nano cohort: 7 pass; one measured chat-only resume profile finding: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63512263
Exact final-SHA Nemotron chat rerun: pass: https://gitlab-master.nvidia.com/dl/JoC/nemo-ci/-/pipelines/63517674

Additional information

The former base PR test(checkpoint): improve resume correctness diagnostics #3562 is merged; this branch targets main directly and includes the latest main updates through a normal merge commit.
Related: AMINT-260, AMINT-268, AMINT-269, AMINT-270, AMINT-278, AMINT-286, AMINT-287, AMINT-288, AMINT-289, AMINT-290, AMINT-291, AM-202

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Base automatically changed from yuhez/test/resume-correctness-diagnostics to main August 18, 2026 17:06

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test(ci): remove legacy checkpoint parity fields

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test(ci): unify checkpoint parity overrides

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test(ci): support per-comparison parity profiles

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test(ci): report Jensen-Shannon checkpoint parity metrics #3620

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test(checkpoint): expand parity metrics and phase coverage - #3567

test(checkpoint): expand parity metrics and phase coverage#3567
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yuhez/test/checkpoint-parity-metrics

yuhezhang-ai commented Aug 17, 2026 •

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What does this PR do?

Changelog

Phase contract

Numerical profiles

Scoped-CI calibration

Current decisions

Final routed-MoE regression metrics

Outstanding model issues

Step3.7 and Gemma4 HF-reference evidence

Validation

Additional information

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yuhezhang-ai commented Aug 17, 2026 •

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