---
license: cc-by-4.0
language:
- uk
- en
tags:
- tokenizer
- fertility
- multilingual
- legal
- subword-analysis
- arxiv:2605.14890
size_categories:
- n<1K
task_categories:
- text-classification
- arxiv:2605.24718
---

# Tokenizer Fertility Map

**Paper:** [The Tokenizer Tax Across 25 European Languages: Domain Invariance, Cross-Lingual Few-Shot Effects, and the Ukrainian Penalty](https://arxiv.org/abs/2605.24718)

Cross-model tokenizer fertility measurements for Ukrainian legal text and subword analysis.

## Description

Fertility measures how many tokens a tokenizer produces per character of input text. Lower fertility = more efficient tokenization. This dataset compares fertility across major LLM tokenizers on Ukrainian legal text from the EDRSR corpus.

## Configs

- **fertility** (156 rows): per-model fertility scores across languages and domains
- **subword_analysis** (72 rows): subword segmentation patterns for Ukrainian legal terms

## Related

- [Tokenizer Fertility Paper (arXiv:2605.14890)](https://arxiv.org/abs/2605.14890)
- [EDRSR Court Decisions Dataset](https://huggingface.co/datasets/overthelex/ukrainian-court-decisions)