---
license: other
license_name: mixed-source-licenses
license_link: https://huggingface.co/datasets/KeisukeMiyamoto/SyntheticTalk-jp#source-datasets-and-licenses
license_details: Each row remains subject to the license and terms of its source dataset.
language:
  - ja
task_categories:
  - text-generation
annotations_creators:
  - machine-generated
language_creators:
  - found
  - machine-generated
multilinguality:
  - monolingual
source_datasets:
  - APTO-001/instruction-following-dataset
  - APTO-001/ja-safety-sft-dataset
  - APTO-001/japanese-civil-law-llm-instruction-dataset
  - APTO-001/japanese-reasoning-dataset-sample
  - APTO-001/japanese-style-contrast-dataset
  - APTO-001/llm-safety-japanese-multiturn-dataset
  - Aratako/Japanese-Creative-Writing-39.6k
  - Aratako/Magpie-Tanuki-8B-97k
  - Aratako/Magpie-Tanuki-Instruction-100k-Embeddings
  - Aratako/Magpie-Tanuki-Instruction-Selected-Evolved-26.5k
  - Aratako/Self-Instruct-Qwen2.5-72B-Instruct-60k
  - Aratako/Synthetic-JP-Conversations-Magpie-Nemotron-4-10k
  - Aratako/gemma-2-27b-evol-instruct-88k-sft
  - CohereLabs/aya_dataset
  - DataPilot/Generated-dataset-by-deepseek-v2.5
  - DataPilot/Knowledge-QA-SingleTurn-Dataset
  - DataPilot/Zero_SFT_Ja_by_Mistral_Small
  - DataPilot/Zero_SFT_Ja_v2
  - DataPilot/Zero_SFT_Ja_v2_b3t4
  - DataPilot/Zero_SFT_Ja_v3.5
  - DataPilot/Zero_SFT_Ja_v3_Reasoning
  - DeL-TaiseiOzaki/Debatedata_with_feedback
  - DeL-TaiseiOzaki/Tengentoppa-sft-qwen2.5-32b-reasoning-100k
  - DeL-TaiseiOzaki/Tengentoppa-sft-v4.0
  - DeL-TaiseiOzaki/argue_instrcution_data_ja
  - DeL-TaiseiOzaki/magpie-gemma-2-9b-it
  - DeL-TaiseiOzaki/magpie-qwen2.5-32B-10K-ja
  - DeL-TaiseiOzaki/magpie-reasonig-ja-qwen2.5-72b-16k
  - OpenAssistant/oasst1
  - allenai/WildChat-1M
  - llm-jp/extraction-wiki-ja
  - llm-jp/llm-jp-chatbot-arena-conversations
  - llm-jp/llm-jp-instructions
  - llm-jp/magpie-sft-v1.0
  - megagonlabs/instruction_ja
  - tokyotech-llm/swallow-gemma-magpie-v0.1
models:
  - google/gemma-4-31B
  - google/gemma-4-12B
pretty_name: LambdaTalk-v2
size_categories:
  - 1M<n<10M
tags:
  - japanese
  - synthetic
  - conversational
  - multi-turn
  - instruction-following
  - supervised-fine-tuning
  - parquet
configs:
  - config_name: default
    data_files:
      - split: train
        path: train-*.parquet
      - split: validation
        path: validation.parquet
      - split: test
        path: test.parquet
---

# LambdaTalk-v2

LambdaTalk-v2 is a Japanese synthetic multi-turn conversation dataset generated with [Gemma 4 31B](https://huggingface.co/google/gemma-4-31b). It contains conversations based on seed questions collected from 36 source datasets.

Each conversation contains three user-assistant turns. The first user message is the original seed question. The remaining five messages were generated by Gemma 4 31B.

## Purpose

The main purpose of this dataset is supervised fine-tuning of Japanese conversational language models.

## Dataset Size

| Split | Rows | User tokens | Assistant tokens |
|---|---:|---:|---:|
| Train | 1,033,187 | 90M | 108M |
| Validation | 10,542 | 919K | 1M |
| Test | 10,542 | 919K | 1M |
| **Total** | **1,054,271** | **92M** | **110M** |

Rows were shuffled before the 98% train, 1% validation, and 1% test split. Token counts were measured with the [Gemma 4 tokenizer](https://huggingface.co/google/gemma-4-12B) without adding special tokens.

## Columns

| Column | Description |
|---|---|
| `id` | Unique ID. |
| `source_dataset` | Name of the dataset that contains the seed question. |
| `messages` | Six-message conversation. Each message has `role` and `content`. |
| `user_tokens` | Total Gemma 4 token count of all user messages in the row. |
| `assistant_tokens` | Total Gemma 4 token count of all assistant messages in the row. |

## Example

```python
from datasets import load_dataset

dataset = load_dataset("<DATASET_REPOSITORY>", split="train")
print(dataset[0]["messages"])
```

## Source Datasets and Licenses

This dataset does not have one uniform license. Each row remains subject to the license and terms of its source dataset. Users must review the linked source terms before modification, redistribution, commercial use, or model training. `Unknown` means that the permission could not be confirmed from the available license information.

| Source dataset | Rows | License | Modify | Redistribute | Commercial use | Notes |
|---|---:|---|---|---|---|---|
| [APTO-001/instruction-following-dataset](https://huggingface.co/datasets/APTO-001/instruction-following-dataset) | 155 | apache-2.0 | Yes | Yes | Yes | |
| [APTO-001/ja-safety-sft-dataset](https://huggingface.co/datasets/APTO-001/ja-safety-sft-dataset) | 456 | cc-by-4.0 | Yes | Yes | Yes | |
| [APTO-001/japanese-civil-law-llm-instruction-dataset](https://huggingface.co/datasets/APTO-001/japanese-civil-law-llm-instruction-dataset) | 100 | apache-2.0 | Yes | Yes | Yes | |
| [APTO-001/japanese-reasoning-dataset-sample](https://huggingface.co/datasets/APTO-001/japanese-reasoning-dataset-sample) | 65 | apache-2.0 | Yes | Yes | Yes | |
| [APTO-001/japanese-style-contrast-dataset](https://huggingface.co/datasets/APTO-001/japanese-style-contrast-dataset) | 1,776 | unknown | Yes | Yes | Yes | |
| [APTO-001/llm-safety-japanese-multiturn-dataset](https://huggingface.co/datasets/APTO-001/llm-safety-japanese-multiturn-dataset) | 89 | apache-2.0 | Yes | Yes | Yes | |
| [Aratako/Japanese-Creative-Writing-39.6k](https://huggingface.co/datasets/Aratako/Japanese-Creative-Writing-39.6k) | 15,158 | mit | Yes | Yes | Yes | |
| [Aratako/Magpie-Tanuki-8B-97k](https://huggingface.co/datasets/Aratako/Magpie-Tanuki-8B-97k) | 92,365 | apache-2.0 | Yes | Yes | Yes | |
| [Aratako/Magpie-Tanuki-Instruction-100k-Embeddings](https://huggingface.co/datasets/Aratako/Magpie-Tanuki-Instruction-100k-Embeddings) | 92,903 | unknown | Unknown | Unknown | Unknown | |
| [Aratako/Magpie-Tanuki-Instruction-Selected-Evolved-26.5k](https://huggingface.co/datasets/Aratako/Magpie-Tanuki-Instruction-Selected-Evolved-26.5k) | 25,028 | apache-2.0 + Qwen | Yes | Yes | Yes | |
| [Aratako/Self-Instruct-Qwen2.5-72B-Instruct-60k](https://huggingface.co/datasets/Aratako/Self-Instruct-Qwen2.5-72B-Instruct-60k) | 58,585 | Apache 2.0 + Qwen License | See terms | See terms | See terms | Subject to the Qwen License. |
| [Aratako/Synthetic-JP-Conversations-Magpie-Nemotron-4-10k](https://huggingface.co/datasets/Aratako/Synthetic-JP-Conversations-Magpie-Nemotron-4-10k) | 9,224 | apache-2.0 | Yes | Yes | Yes | |
| [Aratako/gemma-2-27b-evol-instruct-88k-sft](https://huggingface.co/datasets/Aratako/gemma-2-27b-evol-instruct-88k-sft) | 80,395 | unknown | Unknown | Unknown | Unknown | |
| [CohereLabs/aya_dataset](https://huggingface.co/datasets/CohereLabs/aya_dataset) | 5,677 | apache-2.0 | Yes | Yes | Yes | Japanese subset only. |
| [DataPilot/Generated-dataset-by-deepseek-v2.5](https://huggingface.co/datasets/DataPilot/Generated-dataset-by-deepseek-v2.5) | 107 | unknown | Unknown | Unknown | Unknown | The referenced DeepSeek model license does not grant rights to data. |
| [DataPilot/Knowledge-QA-SingleTurn-Dataset](https://huggingface.co/datasets/DataPilot/Knowledge-QA-SingleTurn-Dataset) | 5,639 | odc-by | Unknown | Unknown | Unknown | The upstream source license must be checked. |
| [DataPilot/Zero_SFT_Ja_by_Mistral_Small](https://huggingface.co/datasets/DataPilot/Zero_SFT_Ja_by_Mistral_Small) | 4,680 | apache-2.0 | Yes | Yes | Yes | |
| [DataPilot/Zero_SFT_Ja_v2](https://huggingface.co/datasets/DataPilot/Zero_SFT_Ja_v2) | 35,828 | cdla-permissive-2.0 | Yes | Yes | Yes | |
| [DataPilot/Zero_SFT_Ja_v2_b3t4](https://huggingface.co/datasets/DataPilot/Zero_SFT_Ja_v2_b3t4) | 13,091 | apache-2.0 | Yes | Yes | Yes | |
| [DataPilot/Zero_SFT_Ja_v3.5](https://huggingface.co/datasets/DataPilot/Zero_SFT_Ja_v3.5) | 98,661 | odc-by | Yes | Yes | Yes | |
| [DataPilot/Zero_SFT_Ja_v3_Reasoning](https://huggingface.co/datasets/DataPilot/Zero_SFT_Ja_v3_Reasoning) | 28,490 | odc-by | Yes | Yes | Yes | |
| [DeL-TaiseiOzaki/Debatedata_with_feedback](https://huggingface.co/datasets/DeL-TaiseiOzaki/Debatedata_with_feedback) | 14 | apache-2.0 | Yes | Yes | Yes | |
| [DeL-TaiseiOzaki/Tengentoppa-sft-qwen2.5-32b-reasoning-100k](https://huggingface.co/datasets/DeL-TaiseiOzaki/Tengentoppa-sft-qwen2.5-32b-reasoning-100k) | 103,173 | apache-2.0 | Yes | Yes | Yes | |
| [DeL-TaiseiOzaki/Tengentoppa-sft-v4.0](https://huggingface.co/datasets/DeL-TaiseiOzaki/Tengentoppa-sft-v4.0) | 159,193 | cc-by-4.0 | Yes | Yes | Yes | |
| [DeL-TaiseiOzaki/argue_instrcution_data_ja](https://huggingface.co/datasets/DeL-TaiseiOzaki/argue_instrcution_data_ja) | 196 | unknown | Unknown | Unknown | Unknown | |
| [DeL-TaiseiOzaki/magpie-gemma-2-9b-it](https://huggingface.co/datasets/DeL-TaiseiOzaki/magpie-gemma-2-9b-it) | 12,423 | Gemma | Yes | Yes | Yes | |
| [DeL-TaiseiOzaki/magpie-qwen2.5-32B-10K-ja](https://huggingface.co/datasets/DeL-TaiseiOzaki/magpie-qwen2.5-32B-10K-ja) | 5,194 | apache-2.0 | Yes | Yes | Yes | |
| [DeL-TaiseiOzaki/magpie-reasonig-ja-qwen2.5-72b-16k](https://huggingface.co/datasets/DeL-TaiseiOzaki/magpie-reasonig-ja-qwen2.5-72b-16k) | 12,034 | unknown | Unknown | Unknown | Unknown | |
| [OpenAssistant/oasst1](https://huggingface.co/datasets/OpenAssistant/oasst1) | 47 | apache-2.0 | Yes | Yes | Yes | Japanese subset only. |
| [allenai/WildChat-1M](https://huggingface.co/datasets/allenai/WildChat-1M) | 1,889 | odc-by | Yes | Yes | Yes | Japanese subset only. |
| [llm-jp/extraction-wiki-ja](https://huggingface.co/datasets/llm-jp/extraction-wiki-ja) | 29,602 | apache-2.0 | Yes | Yes | Yes | |
| [llm-jp/llm-jp-chatbot-arena-conversations](https://huggingface.co/datasets/llm-jp/llm-jp-chatbot-arena-conversations) | 582 | cc | Yes | Yes | Yes | |
| [llm-jp/llm-jp-instructions](https://huggingface.co/datasets/llm-jp/llm-jp-instructions) | 898 | cc-by-4.0 | Yes | Yes | Yes | |
| [llm-jp/magpie-sft-v1.0](https://huggingface.co/datasets/llm-jp/magpie-sft-v1.0) | 39,003 | apache-2.0 | Yes | Yes | Yes | |
| [megagonlabs/instruction_ja](https://huggingface.co/datasets/megagonlabs/instruction_ja) | 625 | mit | Yes | Yes | Yes | |
| [tokyotech-llm/swallow-gemma-magpie-v0.1](https://huggingface.co/datasets/tokyotech-llm/swallow-gemma-magpie-v0.1) | 120,926 | Gemma | Yes | Yes | Yes | |

## Notes

This is synthetic data. It may contain factual errors, hallucinations, bias, unsafe content, or low-quality conversations. Users should review the data and source licenses for their own use case.

---

## Support Lambda

[Lambda](https://github.com/KeisukeMiyamoto1324/lambda) is an open-source project for building small Japanese language models from scratch. As a student, I have funded this project with income from my part-time job, but the growing training costs are becoming difficult to cover.

Your support helps cover GPU costs and develop larger models. Thank you for helping Lambda continue to grow.

### Vast.ai

Vast.ai offers affordable cloud GPUs for AI training, with **NVIDIA H100 SXM GPUs available from around $1.54 per hour**. If you purchase credits through the link below, I receive 3% in GPU credits at no extra cost to you.

https://cloud.vast.ai/?ref_id=521936

### Ko-fi

Support Lambda with a donation starting from $5.

<a href="https://ko-fi.com/lambda_llm">
  <img src="assets/support_me_on_kofi_badge_blue.png" alt="Support Lambda on Ko-fi" width="240">
</a>