---
title: Sphragis Leaderboard
emoji: 🥇
colorFrom: green
colorTo: indigo
sdk: static
app_file: index.html
pinned: true
license: apache-2.0
short_description: Leaderboard for Ancient Greek author attribution
fullWidth: true
datasets:
- Urdatorn/sphragis
tags:
- leaderboard
- authorship-attribution
- ancient-greek
---

# Sphragis Leaderboard

A statically generated SvelteKit + TypeScript leaderboard for the current
Sphragis Ancient Greek authorship-attribution benchmarks. The UI uses Svelte 5
runes and runs without Python, CPU, or GPU Space hardware.

The rebuilt leaderboard's typed task catalog in `src/lib/data.ts` covers:

- Sphragis `sentence_{1,5,10,50}`
- Sphragis `source_held_out_{1,5,10,50}`
- Sphragis-Metre `verse_{1,5,10,50}`

Published contenders include OLMo-1B authorial language models, character
n-grams, end-to-end and frozen GreBERTa, lemma TF-IDF, Burrows lemma z-scores,
syntax feature rates, and (for Sphragis-Metre) metrical line features. All
applicable feature orders and dimensions are selected independently for every
task using validation macro-F1. Scores, per-author accuracies, and confusion
matrices come from the same saved held-out predictions as the reported score.

Install and run locally:

```bash
npm ci
npm run dev
```

The table interaction and visual architecture adapt patterns from the
Apache-2.0-licensed
[`embeddings-benchmark/leaderboard-frontend`](https://github.com/embeddings-benchmark/leaderboard-frontend).
See `NOTICE` for attribution.