Essay coach

Three small models behind the Labs essay coach page: six analytic writing scores (ELLIPSE), argument parts with effectiveness (PERSUADE 2.0), and a ridge band estimate fitted on human-banded IELTS essays.

runs/scores-v1: deberta-v3-base regression head, MCRMSE 0.446 on the ELLIPSE test split (2,571 essays).
runs/parts-v1: deberta-v3-base token model, BIO over 7 part types plus effectiveness; span F1 0.656 and effectiveness log loss 0.478 on 2,000 held-out PERSUADE essays.
runs/band-v1: band.json, ridge on the six scores + part counts + length; 5-fold CV RMSE 0.79 bands, within half a band 67% of the time on 1,435 essays. An estimate, not a grade.
code/: the training, decoding and serving code as of upload.

Trained on ELLIPSE and PERSUADE 2.0 (both CC BY-NC-SA 4.0), so these weights carry the same licence: share alike, non-commercial. Backbone: microsoft/deberta-v3-base.

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