refactor(models): make seq_lens a universal custom-model contract#2971

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hubert-marek wants to merge 11 commits into

feat/rl-multimodal-cpfrom

feat/seq-lens-universal

Commits on Jul 6, 2026

feat(sft): seq_lens as the packed-sample boundary contract

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feat(rl): thread seq_lens through transport, packer, and trainer forward

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feat(sft): multimodal (VLM) SFT

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fix: save processor before tokenizer in weight checkpoints

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fix: freeze vision encoder for text-only training of VLM checkpoints

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fix: fail loudly when renderer produces multimodal data without [model.vlm]

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feat(cp): context parallelism for hybrid + VLM SFT

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feat(rl): pack multimodal samples
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fix: fail loudly when RL micro batches carry multimodal data without [model.vlm]

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feat(rl): multimodal context parallelism

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Commits on Jul 7, 2026

refactor(models): make seq_lens a universal custom-model contract

hubert-marek
and
claude
committed