sc-layout-models

ONNX exports of Armaggheddon/yolo26-document-layout (MIT), used as the default layout detector by sc_toolkit's hybrid PDF parser.

Exported with tools/export_layout_onnx.py from the sc_toolkit repo: imgsz=1280, opset=17, simplified, names class metadata embedded. Served through onnxruntime (MIT); ultralytics is used at export time only and is not required to run these files.

file	variant	size
yolo26m_doc_layout.onnx	m — the sc_toolkit default	~82 MB
yolo26n_doc_layout.onnx	n — the cheap option (HYBRID_LAYOUT_MODEL=superchaintech/sc-layout-models#yolo26n_doc_layout.onnx)	~10 MB

Known deviation from the source weights (measured, sc_toolkit repo, docs/layout-model-comparison-2026-08.md): the ONNX decode agrees with the ultralytics runtime on ~98% of regions at IoU≥0.5 and can differ on the rest.