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name: post-training-rl-and-multimodal description: "Route optional Megatron ModelOpt, RL/GRPO, VLM, and multimodal/MIMO workflows with explicit dependency and hardware limits." metadata: disco-role: operating disable-model-invocation: true license: NOASSERTION

post-training-rl-and-multimodal

Use this sub-skill for ModelOpt quantization/pruning/distillation/export, Megatron RL/GRPO, VLM, audio/video, and MIMO workflows. These surfaces are optional and usually need more than the minimal Megatron Core install.

Read first

• For ModelOpt and post-training operations, read references/post-training-workflows.md.
• For RL/GRPO concepts, rollout/inference handles, packed data, and configs, read references/rl-workflows.md.
• For VLM/multimodal/MIMO data and model-provider boundaries, read references/multimodal-workflows.md.
• For missing optional packages, data/checkpoint mismatch, GPU memory, and config failures, read references/troubleshooting.md.

Route by task

Task	Route
Quantize/prune/export a model	Confirm ModelOpt install, checkpoint/model compatibility, and target artifact before running.
Run GRPO/RL post-training	Confirm reward/environment configs, rollout backend, packed sequence schema, and GPU topology.
Train a VLM/MIMO model	Confirm media manifest/schema, encoder/model-provider, tokenizer, and heterogeneous topology.
Only run a standard GPT pretrain	Route to ../training-cli-and-data/SKILL.md.
Missing ModelOpt/vision/audio dependency	Route to ../install-and-environment/SKILL.md for a minimal extra install; do not install all dev deps blindly.

Safety

• Do not start long RL training, model conversion, or server processes as a probe.
• Use --help, import checks, and tiny mock fixtures first.
• Treat external reward services, HF tokens, media datasets, and model checkpoints as user-provided resources; never embed credentials.
• Expect H100/Blackwell and large-memory assumptions for many current examples; document unverified hardware rather than substituting a CPU check.

Boundaries

• Core model/topology decisions belong to ../core-models-and-parallelism/SKILL.md.
• Generic environment and optional dependency installation belongs to ../install-and-environment/SKILL.md.
• Checkpoint format/conversion belongs to ../checkpointing-and-conversion/SKILL.md.