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metadata
language:
  - af
  - ar
  - bg
  - ca
  - cs
  - da
  - de
  - el
  - en
  - es
  - et
  - eu
  - fa
  - fi
  - fr
  - ga
  - he
  - hi
  - hr
  - hu
  - hy
  - id
  - it
  - ja
  - ko
  - lt
  - lv
  - mr
  - nl
  - 'no'
  - pl
  - pt
  - ro
  - ru
  - sa
  - sk
  - sl
  - sr
  - sv
  - ta
  - te
  - tr
  - uk
  - ur
  - vi
license: mit
pretty_name: Multilingual Tokenizer Wikipedia Benchmark
dataset_info:
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        dtype: string
      - name: split_text
        sequence: string
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        num_bytes: 3685585608
        num_examples: 1288680
      - name: clean
        num_bytes: 3669872935.086358
        num_examples: 1283186
    download_size: 2646807342
    dataset_size: 7355458543.086358
  - config_name: zh
    features:
      - name: id
        dtype: string
      - name: url
        dtype: string
      - name: title
        dtype: string
      - name: text
        dtype: string
      - name: split_text
        sequence: string
    splits:
      - name: train
        num_bytes: 7820979602
        num_examples: 1384748
      - name: clean
        num_bytes: 7781957954.689285
        num_examples: 1377839
    download_size: 6540517932
    dataset_size: 15602937556.689285
configs:
  - config_name: af
    data_files:
      - split: train
        path: af/train-*
      - split: clean
        path: af/clean-*
  - config_name: ar
    data_files:
      - split: train
        path: ar/train-*
      - split: clean
        path: ar/clean-*
  - config_name: bg
    data_files:
      - split: train
        path: bg/train-*
      - split: clean
        path: bg/clean-*
  - config_name: ca
    data_files:
      - split: train
        path: ca/train-*
      - split: clean
        path: ca/clean-*
  - config_name: cs
    data_files:
      - split: train
        path: cs/train-*
      - split: clean
        path: cs/clean-*
  - config_name: da
    data_files:
      - split: train
        path: da/train-*
      - split: clean
        path: da/clean-*
  - config_name: de
    data_files:
      - split: train
        path: de/train-*
      - split: clean
        path: de/clean-*
  - config_name: el
    data_files:
      - split: train
        path: el/train-*
      - split: clean
        path: el/clean-*
  - config_name: en
    data_files:
      - split: train
        path: en/train-*
      - split: clean
        path: en/clean-*
  - config_name: es
    data_files:
      - split: train
        path: es/train-*
      - split: clean
        path: es/clean-*
  - config_name: et
    data_files:
      - split: train
        path: et/train-*
      - split: clean
        path: et/clean-*
  - config_name: eu
    data_files:
      - split: train
        path: eu/train-*
      - split: clean
        path: eu/clean-*
  - config_name: fa
    data_files:
      - split: train
        path: fa/train-*
      - split: clean
        path: fa/clean-*
  - config_name: fi
    data_files:
      - split: train
        path: fi/train-*
      - split: clean
        path: fi/clean-*
  - config_name: fr
    data_files:
      - split: train
        path: fr/train-*
      - split: clean
        path: fr/clean-*
  - config_name: ga
    data_files:
      - split: train
        path: ga/train-*
      - split: clean
        path: ga/clean-*
  - config_name: he
    data_files:
      - split: train
        path: he/train-*
      - split: clean
        path: he/clean-*
  - config_name: hi
    data_files:
      - split: train
        path: hi/train-*
      - split: clean
        path: hi/clean-*
  - config_name: hr
    data_files:
      - split: train
        path: hr/train-*
      - split: clean
        path: hr/clean-*
  - config_name: hu
    data_files:
      - split: train
        path: hu/train-*
      - split: clean
        path: hu/clean-*
  - config_name: hy
    data_files:
      - split: train
        path: hy/train-*
      - split: clean
        path: hy/clean-*
  - config_name: id
    data_files:
      - split: train
        path: id/train-*
      - split: clean
        path: id/clean-*
  - config_name: it
    data_files:
      - split: train
        path: it/train-*
      - split: clean
        path: it/clean-*
  - config_name: ja
    data_files:
      - split: train
        path: ja/train-*
      - split: clean
        path: ja/clean-*
  - config_name: ko
    data_files:
      - split: train
        path: ko/train-*
      - split: clean
        path: ko/clean-*
  - config_name: lt
    data_files:
      - split: train
        path: lt/train-*
      - split: clean
        path: lt/clean-*
  - config_name: lv
    data_files:
      - split: train
        path: lv/train-*
      - split: clean
        path: lv/clean-*
  - config_name: mr
    data_files:
      - split: train
        path: mr/train-*
      - split: clean
        path: mr/clean-*
  - config_name: nl
    data_files:
      - split: train
        path: nl/train-*
      - split: clean
        path: nl/clean-*
  - config_name: 'no'
    data_files:
      - split: train
        path: no/train-*
      - split: clean
        path: no/clean-*
  - config_name: pl
    data_files:
      - split: train
        path: pl/train-*
      - split: clean
        path: pl/clean-*
  - config_name: pt
    data_files:
      - split: train
        path: pt/train-*
      - split: clean
        path: pt/clean-*
  - config_name: ro
    data_files:
      - split: train
        path: ro/train-*
      - split: clean
        path: ro/clean-*
  - config_name: ru
    data_files:
      - split: train
        path: ru/train-*
      - split: clean
        path: ru/clean-*
  - config_name: sa
    data_files:
      - split: train
        path: sa/train-*
      - split: clean
        path: sa/clean-*
  - config_name: sk
    data_files:
      - split: train
        path: sk/train-*
      - split: clean
        path: sk/clean-*
  - config_name: sl
    data_files:
      - split: train
        path: sl/train-*
      - split: clean
        path: sl/clean-*
  - config_name: sr
    data_files:
      - split: train
        path: sr/train-*
      - split: clean
        path: sr/clean-*
  - config_name: sv
    data_files:
      - split: train
        path: sv/train-*
      - split: clean
        path: sv/clean-*
  - config_name: ta
    data_files:
      - split: train
        path: ta/train-*
      - split: clean
        path: ta/clean-*
  - config_name: te
    data_files:
      - split: train
        path: te/train-*
      - split: clean
        path: te/clean-*
  - config_name: tr
    data_files:
      - split: train
        path: tr/train-*
      - split: clean
        path: tr/clean-*
  - config_name: uk
    data_files:
      - split: train
        path: uk/train-*
      - split: clean
        path: uk/clean-*
  - config_name: ur
    data_files:
      - split: train
        path: ur/train-*
      - split: clean
        path: ur/clean-*
  - config_name: vi
    data_files:
      - split: train
        path: vi/train-*
      - split: clean
        path: vi/clean-*
  - config_name: zh
    data_files:
      - split: train
        path: zh/train-*
      - split: clean
        path: zh/clean-*

Multilingual Tokenizer Benchmark

This dataset includes pre-processed wikipedia data for tokenizer evaluation in 45 languages. We provide more information on the evaluation task in general this blogpost.

Usage

The dataset allows us to easily calculate tokenizer fertility and the proportion of continued words on any of the supported languages. In the example below we take the Mistral tokenizer and evaluate its performance on Slovak.

from transformers import AutoTokenizer
from datasets import load_dataset
import numpy as np

def calculate_metrics(tokens):
    tmp = np.array([len(y) for y in tokens])
    return {'fertility': np.mean(tmp), 'cont_prop': np.count_nonzero(tmp > 1) / tmp.shape[0]}

tokenizer_name = 'mistralai/Mistral-7B-v0.1'
language = 'sk' #Slovak
tokenizer = AutoTokenizer.from_pretrained(tokenizer_name)
ds = load_dataset('occiglot/tokenizer-wiki-bench', name=language, split='clean')

remove_columns = list(set(ds.column_names) - set(["text"]))
ds = ds.map(lambda x: {'tokens': tokenizer(x['split_text'], add_special_tokens=False)['input_ids']} ,num_proc=256, remove_columns=remove_columns, batched=False)
remove_columns = None#list(set(ds.column_names))
ds = ds.map(lambda x: calculate_metrics(x['tokens']), num_proc=256, remove_columns=remove_columns,  batched=False)
df = ds.to_pandas()

print('Fertility: ', df.fertility.mean())
print('Prop. continued words:', df.cont_prop.mean())

Dataset Creation

We loosely follow the approach of Rust _et al. using the fast UDPipe to pre-split documents into words and subsequently run the tokenizer over isolated words. For all languages we use the respective November 2023 snapshot from Wikipedia. Since Wikipedia, by nature, contains significantly more numbers and dates than other text and most tokenizers split those into single digits, we filtered all lone-standing numbers from the documents. Additionally, we removed any documents that still contained non-parsed HTML code (less than 1%).

Licensing

We release our curated benchmark and any associated code under MIT license. However, depending on your use case, the licensing conditions of the original Wikipedia data and UDPipe may apply.

Supported Languages

This dataset currently contains pre-processed data for the following languages:

Language Code
Afrikaans af
Arabic ar
Armenian hy
Basque eu
Bulgarian bg
Catalan ca
Croatian hr
Czech cs
Danish da
Dutch nl
English en
Estonian et
Finnish fi
French fr
German de
Greek el
Hebrew he
Hindi hi
Hungarian hu
Indonesian id
Irish ga
Italian it
Japanese ja
Korean ko
Latvian lv
Lithuanian lt
Marathi mr
Norwegian no
Persian fa
Polish pl
Portuguese pt
Romanian ro
Russian ru
Sanskrit sa
Serbian sr
Slovak sk
Slovenian sl
Spanish es
Swedish sv
Tamil ta
Telugu te
Turkish tr
Ukrainian uk
Urdu ur
Vietnamese vi