NAM56R Megatron translation

The public story here is not that NAM56RQuick term guideNAM56RA concrete MegaCpp hybrid family name whose meaning lives in the launch pattern, feature placement, and runtime constraints rather than in one marketing label.GroundingAbout: MegaCpp model glossary Example: NAM56R Megatron plan sample already has a fully native MegatronQuick term guideMegatronWhy lifting a hybrid attention/Mamba/MoE stack into Megatron-Core is a multi-adapter exercise: base config mapping, layer specs, mixer protocol, and…GroundingPorting To Megatron-Core Is Harder Than It Looks What Megatron Can and Cannot Split equivalent. It does not.

The useful thing to publish is the translation contract: which symbols map cleanly, which ones stay custom, and where the translation has to fail closed instead of pretending the pattern is more native than it really is.

The glossary-first checkpoint is this: the public NAM56RQuick term guideNAM56RA concrete MegaCpp hybrid family name whose meaning lives in the launch pattern, feature placement, and runtime constraints rather than in one marketing label.GroundingAbout: MegaCpp model glossary Example: NAM56R Megatron plan sample recipe family uses the pattern AEMEAEMEAEMRQuick term guideAEMEAEMEAEMRA concrete NAM56R-style hybrid pattern string that encodes the ordered A/M/E/R block mix.GroundingAbout: MegaCpp model glossary Example: NAM56R Megatron plan sample Example: NAM56R pattern composition sample at depth 52. Translation only makes sense if those letters stay meaningful while the pattern is lowered into a MegatronQuick term guideMegatronWhy lifting a hybrid attention/Mamba/MoE stack into Megatron-Core is a multi-adapter exercise: base config mapping, layer specs, mixer protocol, and…GroundingPorting To Megatron-Core Is Harder Than It Looks What Megatron Can and Cannot Split-facing surface.

For first touch, a translation plan is the intermediate artifact between the authored recipe and the final CLI. A fail-closed translation plan maps the supported subset and keeps every unsupported seam visible instead of inventing a fake analogue. That is exactly what the checked-in translation samples do.

That is why the checked-in examples keep R visible and keep M marked as a custom seam instead of flattening the whole pattern into one cleaner-looking string. If the unresolved pieces disappear too early, the migration story gets less honest, not more.

If you need the naming side before the migration side, read MegaCpp model glossary first and keep NAM56R launch policy beside this article. The translation story only stays honest when the glossary and operator story agree.

Glossary checkpoint: which letters lower cleanly

The local plan and args surfaces make the lowering boundary legible:

• NAM56R Megatron plan sample keeps the plan explicit before shell flags exist.
• Fail-closed pattern translation sample shows the refusal rule itself: supported tokens map, unsupported ones raise.
• Megatron args sample emits the native CLI subset and keeps custom notes for everything that still is not native.

The last sample is especially useful for first touch because it shows concrete native flags, not just symbolic translation.

That is the core rule for A/M/E/RQuick term guideA / M / E / RMegaCpp shorthand for the four main block families: attention, Mamba/state-space, expert/MoE, and recurrent tail layers.GroundingAbout: SLM architecture Example: hybrid layout notes Example: block taxonomy sample in this article:

Why this translation layer matters

Pattern translation is easy to oversell. A translated string is not enough by itself. It still has to carry feature placement, MTP suffix policy, and the set of seams that remain non-native.

A fail-closed plan sits between the authored recipe and the emitted args bundle. NAM56R Megatron plan sample keeps the expanded roles visible before shell flags exist, and Megatron args sample emits the native bundle with custom_notes for the seams that are still not native. That is the honest public contract.

Publishing the translation plan as a public example makes the contract honest: the reader can see exactly which parts of NAM56RQuick term guideNAM56RA concrete MegaCpp hybrid family name whose meaning lives in the launch pattern, feature placement, and runtime constraints rather than in one marketing label.GroundingAbout: MegaCpp model glossary Example: NAM56R Megatron plan sample are native today and which parts still depend on custom MegatronQuick term guideMegatronWhy lifting a hybrid attention/Mamba/MoE stack into Megatron-Core is a multi-adapter exercise: base config mapping, layer specs, mixer protocol, and…GroundingPorting To Megatron-Core Is Harder Than It Looks What Megatron Can and Cannot Split integration. That is also why it belongs next to How to express a Nemotron-style recipe as pure Megatron CLI and Porting to Megatron friction: one article explains what can be lowered, while the others show how the remaining runtime seams stay explicit.

Example -> article -> upstream docs

• example: NAM56R Megatron recipe near-copy
• related article: How to express a Nemotron-style recipe as pure Megatron CLI
• upstream docs: Megatron CoreQuick term guideMegatron CoreThe NVIDIA framework surface MegaCpp ports into through narrow adapters, layer specs, and runtime ownership bridges.GroundingAbout: Porting to Megatron friction About: Nemotron-style recipe as pure Megatron CLI Example: Mamba3 TP mixer sample user guide and MegatronQuick term guideMegatronWhy lifting a hybrid attention/Mamba/MoE stack into Megatron-Core is a multi-adapter exercise: base config mapping, layer specs, mixer protocol, and…GroundingPorting To Megatron-Core Is Harder Than It Looks What Megatron Can and Cannot Split-LM repository context