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README.md
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---
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license: mit
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tags: [document-layout, yolo26, onnx, doclaynet]
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---
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# sc-layout-models
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ONNX exports of [Armaggheddon/yolo26-document-layout](https://huggingface.co/Armaggheddon/yolo26-document-layout)
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(MIT), used as the default layout detector by `sc_toolkit`'s hybrid PDF parser.
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Exported with `tools/export_layout_onnx.py` from the sc_toolkit repo:
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imgsz=1280, opset=17, simplified, `names` class metadata embedded. Served
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through `onnxruntime` (MIT); `ultralytics` is used at export time only and is
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not required to run these files.
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| file | variant | size |
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|---|---|---|
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| `yolo26m_doc_layout.onnx` | m — the sc_toolkit default | ~82 MB |
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| `yolo26n_doc_layout.onnx` | n — the cheap option (`HYBRID_LAYOUT_MODEL=superchaintech/sc-layout-models#yolo26n_doc_layout.onnx`) | ~10 MB |
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Known deviation from the source weights (measured, sc_toolkit repo,
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`docs/layout-model-comparison-2026-08.md`): the ONNX decode agrees with the
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ultralytics runtime on ~98% of regions at IoU≥0.5 and can differ on the rest.
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