NeuronAI-2B / fertility_large_20260825.md
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NeuronAI-2B large tokenizer fertility evaluation

Generated: 2026-08-24T19:25:09+00:00

Fertility is the number of tokenizer tokens per whitespace-delimited word; lower is better. The confidence interval is a paired 5,000-replicate bootstrap over 1,000 deterministic document buckets.

Corpus Domain status Documents Words NeuronAI-2B Qwen3.5-2B Token reduction (95% CI)
OSCAR Uzbek held-out web source 100,000 7,618,770 2.0304 3.3639 39.64% (39.57%–39.71%)
Uzbek legal corpus held-out legal source/domain 18,832 2,534,566 2.3747 2.9705 20.06% (19.55%–20.57%)
uz-crawl control training-source control 100,000 20,825,680 2.3206 3.3224 30.15% (30.02%–30.30%)

Interpretation

  • The 2B and 4B evaluated tokenizer pairs are byte-identical, so their token counts are exactly identical. SHA-256 fingerprints are recorded in the JSON result.
  • The held-out-source corpora are the fairness readout; the training-source corpus is retained only as a control.
  • Exact web overlap cannot be ruled out for OSCAR because both corpora ultimately derive from public web data.
  • OSCAR was checked in a post-hoc weak-token coverage analysis but contributed no tokenizer-training rows.
  • The legal corpus is absent from the tokenizer and CPT source manifests and is the cleanest source-and-domain holdout in this run.
  • Results use raw source text without apostrophe normalization or other model-specific preprocessing.