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axolotl/examples/mistral4/README.md
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Markdown

# Finetune Mistral Small 4 with Axolotl
Mistral Small 4 is a 119B parameter (6.5B active) multimodal MoE model from MistralAI that unifies instruct, reasoning, and coding capabilities into a single model. It is available on HuggingFace at [Mistral-Small-4-119B-2603](https://huggingface.co/mistralai/Mistral-Small-4-119B-2603).
Thanks to the team at MistralAI for giving us early access to prepare for this release.
## Getting started
1. Install Axolotl following the [installation guide](https://docs.axolotl.ai/docs/installation.html).
2. Install [Cut Cross Entropy](https://docs.axolotl.ai/docs/custom_integrations.html#cut-cross-entropy) to reduce training VRAM usage
3. Install transformers from main
```bash
uv pip install git+https://github.com/huggingface/transformers.git
```
4. Run one of the example configs:
```bash
# text-only
axolotl train examples/mistral4/qlora-text.yml # no experts ~69 GiB, experts ~93 GiB
axolotl train examples/mistral4/fft-text.yml
# text + vision
# run: wget https://huggingface.co/datasets/Nanobit/text-vision-2k-test/resolve/main/African_elephant.jpg
axolotl train examples/mistral4/qlora-vision.yml # no experts ~68 GiB
axolotl train examples/mistral4/fft-vision.yml
```
Note: FFT configs provided as reference. Please adjust hyperparameters as needed.
## Reasoning Effort
The chat template supports a `reasoning_effort` variable to control the model's reasoning depth:
- `"none"` — instruct mode (default)
- `"high"` — reasoning mode with explicit thinking steps
Pass it via `chat_template_kwargs` under your dataset config:
```yaml
datasets:
- path: your/dataset
type: chat_template
chat_template_kwargs:
reasoning_effort: high
```
## Thinking Support
The chat template supports a `thinking` content type in assistant messages for training on reasoning traces (rendered as `[THINK]...[/THINK]` blocks).
To use thinking datasets, add the `thinking` mapping via `message_property_mappings`:
```yaml
datasets:
- path: your/thinking-dataset
type: chat_template
message_property_mappings:
role: role
content: content
thinking: thinking
chat_template_kwargs:
reasoning_effort: high
```
See the [Magistral thinking guide](../magistral/think/README.md) for dataset format details.
## Tips
- Read more on how to load your own dataset at [docs](https://docs.axolotl.ai/docs/dataset_loading.html).
- The text dataset format follows the OpenAI Messages format as seen [here](https://docs.axolotl.ai/docs/dataset-formats/conversation.html#chat_template).
- The vision model requires multi-modal dataset format as documented [here](https://docs.axolotl.ai/docs/multimodal.html#dataset-format).
## Related Resources
- [MistralAI Mistral Small 4 Blog](https://mistral.ai/news/mistral-small-4)
- [Axolotl Docs](https://docs.axolotl.ai)
- [Axolotl GitHub](https://github.com/axolotl-ai-cloud/axolotl)
- [Axolotl Discord](https://discord.gg/7m9sfhzaf3)