---
license: mit
base_model: Qwen/Qwen3.5-9B
tags:
  - choonsik
  - VLA
  - Minecraft
  - vision-language-action
  - qwen3.5
  - image-text-to-text
datasets:
  - CraftJarvis/minecraft-vla-sft
library_name: transformers
language:
  - en
pipeline_tag: image-text-to-text
---

# Choonsik — Minecraft Vision-Language-Action Model

Choonsik is a **Vision-Language-Action (VLA)** model for Minecraft, built on
[Qwen/Qwen3.5-9B](<https://huggingface.co/Qwen/Qwen3.5-9B>) and trained with the
three-stage **ActVLP** pipeline from
[JARVIS-VLA](https://arxiv.org/abs/2503.16365).

Given a Minecraft observation frame and a natural-language task instruction,
Choonsik outputs keyboard + mouse action tokens that can be executed directly
in the game — covering 1,000+ atomic tasks (crafting, mining, smelting, combat,
navigation, etc.).

| | |
|---|---|
| **Base model** | [Qwen/Qwen3.5-9B](<https://huggingface.co/Qwen/Qwen3.5-9B>) |
| **Training data** | [CraftJarvis/minecraft-vla-sft](<https://huggingface.co/datasets/CraftJarvis/minecraft-vla-sft>) (3.78M examples) |
| **Training stages** | Language → Vision-Language → Imitation Learning |
| **License** | MIT |

## Usage

```python
from choonsik.inference import ChoonsikInferenceRunner
from PIL import Image

runner = ChoonsikInferenceRunner("Infinity08/Choonsik-Qwen3.5-9B")
frame  = Image.open("minecraft_frame.png")

action = runner.predict(frame, task="craft a wooden pickaxe")
# action = {"forward": 0, "attack": 1, ..., "camera": [0.0, 0.3]}
```

## Action Space

Choonsik predicts actions using **mu-law discretized tokens**:

| Token type | Count | Description |
|---|---|---|
| Keyboard | 29 | `forward`, `attack`, `use`, `jump`, hotbar 1–9, … |
| Mouse X | 21 | Horizontal camera rotation (mu-law bins) |
| Mouse Y | 21 | Vertical camera rotation (mu-law bins) |

## Training

Three-stage ActVLP pipeline (following JARVIS-VLA):

1. **Stage 1 — Language post-training**: Minecraft world knowledge (text-only SFT)
2. **Stage 2 — Vision-language alignment**: Image captioning and VQA on gameplay frames
3. **Stage 3 — Imitation learning**: Action prediction on 3.78M trajectory examples

Training hardware: L40S (48 GB VRAM). Inference: RTX 5080 with 4-bit NF4 quantization.

## Citation

If you use Choonsik or the underlying JARVIS-VLA methodology, please cite:

```bibtex
@article{li2025jarvisvla,
  title   = {JARVIS-VLA: Post-Training Large-Scale Vision Language Models
             to Play Visual Games with Keyboards and Mouse},
  author  = {Muyao Li and Zihao Wang and Kaichen He and others},
  journal = {arXiv preprint arXiv:2503.16365},
  year    = {2025}
}
```