feat(engine): Engine training API#2556

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huiyingl/feat/tinker-datum

Commits on Jun 14, 2026

feat(training): add Datum/ModelOutput typed data contract

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feat(engine): add Engine orchestration class (additive, recipe untouched)

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feat(engine): doc-aligned LossFn contract + engine-owned RL normalization

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feat(engine): PackedBatch pass-through door; prove verl integration end-to-end

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feat(engine): RL role semantics — trainable / output_head / hooks / disable_adapters

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refactor(engine): drop RL-role config; Engine stays model-agnostic

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feat(engine): save_state / load_state for training resume (Phase 5 ckpt)

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fix(engine): guard duck-typed output extraction against HF OrderedDict outputs
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feat(engine): multi-microbatch PackedBatch pass-through (verl grad accum)
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feat(engine): tolerate None loss from a forward-only closure (RL inference)
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Commits on Jun 15, 2026