heb-diac-plane-1.0

heb-diac-plane-1.0 — nikud plane-factorized diacritization (on-device frontier)

First Hebrew plane model: the Arabic run-018 recipe applied unchanged
(ByT5-small-class byte-level encoder, no decoder; nikud-plane embedding;
135 order-preserving classes; K=2 mask-predict; parallel forwards, no
KV cache). One self-contained int8 ONNX graph per the plane zip
contract (metadata.yaml with member sha256s + plane.onnx +
classes.json), loadable by interscript[ml] PlaneModel.from_zip.

Nakdimon test, greedy, seq2seq_der (the exact heb-diac-1.1 protocol):

• Total DER 12.48% — the shipped seq2seq student scores 16.44 (−3.96pp,
  24% relative error reduction) at 219 MB-class on-device economics
• Median per-example DER 9.8%; 223,872 scored positions

Provenance: interscript-train run-021 (rababa_hebrew_plane), v4 combined
corpus (nakdimon + sefaria + distilled v1/v2 + expanded_v2; 50,303
units, 2 epochs), checkpoint classes=135. Verdict note: the first
reported number (32.64%) was a window-stitching harness bug; see the
interscript-models RESULTS ledger for the disclosed correction.
License: BSD-3-Clause.