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README.md

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+---
+language:
+- ja
+pretty_name: lambda-corpus
+license: other
+task_categories:
+- text-generation
+tags:
+- japanese
+- pretraining
+- corpus
+- parquet
+size_categories:
+- 10M<n<100M
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: "data/train-*.parquet"
+  - split: validation
+    path: "data/validation.parquet"
+  - split: test
+    path: "data/test.parquet"
+---
+
+# lambda-corpus
+
+lambda-corpus is a Japanese text corpus for language model pretraining. It combines openly available Japanese datasets into a consistent format and provides predefined train, validation, and test splits.
+
+## Purpose
+
+The dataset is intended for pretraining of Japanese language models. It contains web documents, Wikipedia-derived text, academic grant records, and synthetic question-answer text.
+
+## Source Data
+
+| Source | Rows | Tokens | License |
+| --- | ---: | ---: | --- |
+| [KeisukeMiyamoto/CleanedFineWeb2Edu-jp](https://huggingface.co/datasets/KeisukeMiyamoto/CleanedFineWeb2Edu-jp) | 11,772,204 | 7.61B | ODC-BY |
+| [hpprc/jawiki-bullet-points](https://huggingface.co/datasets/hpprc/jawiki-bullet-points) | 3,523,358 | 1.55B | CC BY-SA 4.0 |
+| [kanhatakeyama/CommonCrawl-RAG-QA-Calm3-22b-chat](https://huggingface.co/datasets/kanhatakeyama/CommonCrawl-RAG-QA-Calm3-22b-chat) | 2,525,793 | 1.04B | Other |
+| [hpprc/llmjp-kaken](https://huggingface.co/datasets/hpprc/llmjp-kaken) | 1,079,030 | 1.03B | CC BY 4.0 |
+
+## Dataset Size
+
+| Split | Rows |
+| --- | ---: |
+| train | 18,522,556 |
+| validation | 189,174 |
+| test | 188,655 |
+| total | 18,900,385 |
+
+The dataset contains approximately 11.23B tokens measured with the gemma 4 tokenizer.
+
+## Columns
+
+| Column | Description |
+| --- | --- |
+| `id` | Identifier inherited from the source dataset |
+| `text` | Normalized document text |
+| `output_tokens` | Number of tokens in `text`, measured with the gemma 4 tokenizer |
+| `source` | Name of the source dataset |
+
+## Example
+
+```python
+from datasets import load_dataset
+
+dataset = load_dataset("KeisukeMiyamoto/lambda-corpus")
+print(dataset["train"][0])
+```

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