---
language: [ja, en]
license: cdla-sharing-1.0
pretty_name: TinyStories Japanese
task_categories:
  - text-generation
  - translation
tags:
  - tinystories
  - japanese
  - english
  - translation
  - synthetic
size_categories:
  - 1M<n<10M
configs:
  - config_name: default
    data_files:
      - split: train
        path:
          - data/train-00000-of-00004.jsonl
          - data/train-00001-of-00004.jsonl
          - data/train-00002-of-00004.jsonl
          - data/train-00003-of-00004.jsonl
      - split: validation
        path:
          - data/validation-00000-of-00001.jsonl
---

# TinyStories Japanese

This dataset is a Japanese translation of the TinyStories dataset.

The dataset preserves the original TinyStories train/validation split structure and record order. Each record contains the original English story, its SHA-256 hash, and the Japanese translation.

## Dataset structure

Each record has the following fields:

* `text_hash`: SHA-256 hash of `text_en` encoded as UTF-8.
* `text_en`: Original English TinyStories text.
* `text_ja`: Japanese translation.

Example:

```json
{"text_hash":"...","text_en":"Once upon a time, ...","text_ja":"むかしむかし、..."}
```

## Files

```text
train-00000-of-00004.jsonl
train-00001-of-00004.jsonl
train-00002-of-00004.jsonl
train-00003-of-00004.jsonl
validation-00000-of-00001.jsonl
```

The files follow the same split structure as the source dataset:

* `train`: 4 JSONL shards
* `validation`: 1 JSONL shard

## Translation process

The Japanese translations were generated primarily using `google/gemma-4-26B-A4B` from the original English TinyStories texts.

After translation, the records were realigned to the original TinyStories order using `text_hash`, which is the SHA-256 hash of `text_en` encoded as UTF-8.

A small number of missing or problematic records were manually corrected.

The translations are not fully human-reviewed, and some translation errors, unnatural wording, or artifacts may remain.

## License

This dataset is released under the Community Data License Agreement – Sharing, Version 1.0 (`CDLA-Sharing-1.0`), following the license of the original TinyStories dataset.

## Credits

Japanese translation, alignment, and dataset preparation: Naoki Shibata.

This dataset is derived from the original TinyStories dataset. The translations were generated primarily using `google/gemma-4-26B-A4B`.

## Notes

The translations are not fully human-reviewed. Users should be aware that some translation errors, unnatural wording, or artifacts may remain.

The field `text_hash` can be used to match records with the original English text.