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Open Spell — Evaluation Dataset

A small, hand-curated set of misspelled / corrected pairs used to validate the Open Spell correction kit across four categories: plain spell, grammar (segmentation), phonetic, and domain.

Not a training set. SymSpell is non-parametric and does not need one. This dataset is for regression testing and reporting top-1 accuracy.

Schema

Each line of samples.jsonl is one example:

{
  "id": "spell-001",
  "category": "spell",
  "original": "I lik aples",
  "corrected": "I like apples",
  "domain_terms": []
}
Field Type Description
id string {category}-{index}
category enum spell, grammar, phonetic, or domain
original string Input text with errors
corrected string Expected output
domain_terms string[] Vocabulary to load before correcting (domain category only)

Loading

import json
from pathlib import Path

samples = [json.loads(l) for l in Path("samples.jsonl").read_text().splitlines()]

Or with datasets:

from datasets import load_dataset
ds = load_dataset("json", data_files="samples.jsonl")

Categories

Category Count What it tests
spell 15 Single-word typos, capitalization, trailing punctuation
grammar 15 Missing spaces, extra spaces, compound segmentation
phonetic 10 Sounds-like substitutions (fonephone)
domain 10 Words only correctable with injected custom vocabulary

License

MIT. Examples written from scratch — no scraped or copyrighted material.

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