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README.md

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+---
+license: other
+license_name: research-only
+license_link: https://github.com/jurky123/MC_Gen2.0
+pretty_name: "MC-Gen 2.0 — Minecraft / pixel-art 32x32 texture datasets"
+task_categories:
+  - text-to-image
+tags:
+  - minecraft
+  - pixel-art
+  - texture
+  - diffusion
+  - flow-matching
+  - mmap
+  - research
+size_categories:
+  - 1M<n<10M
+---
+
+# MC-Gen 2.0 — training datasets
+
+Training-ready datasets for the **MC-Gen 2.0** project: a small pixel-space
+Rectified-Flow Transformer that generates Minecraft / voxel-game style
+low-resolution textures (32x32, RGBA).
+
+The source code lives on GitHub: **https://github.com/jurky123/MC_Gen2.0**
+
+This repository only contains the **preprocessed, training-ready** datasets.
+Raw downloads (itch.io, OpenGameArt, Kaggle, Modrinth, Hugging Face mirrors)
+are intentionally not included.
+
+> **License: research / study only.** The datasets aggregate third-party game
+> assets with heterogeneous licenses. They are published here for academic and
+> personal study only. Do not use them commercially, and keep the provenance
+> fields in the metadata for attribution. See *Provenance* below.
+
+## Contents
+
+| Path | Rows | Shape / dtype | Split (train/val/test) | Purpose |
+|---|---|---|---|---|
+| `data/build/stage1_32_rgba` | 3,185,719 | `uint8[32,32,4]` RGBA | 3,004,255 / 91,566 / 89,898 | **Stage 1** pixel + all-MC pretraining |
+| `data/build/mc_text2image32` | 1,034,057 | `uint8[32,32,3]` RGB | 941,104 / 43,184 / 49,769 | Minecraft domain (text+image), Stage 1/2 |
+| `data/processed/minecraft_16x_finetune32` | 1,498 | `32x32` tiles | manifest only | **Stage 3** curated fine-tune seeds |
+| `data/processed/modrinth32` | 10,818 | `32x32` tiles | manifest only | Modrinth MC textures (deduped) |
+
+### `stage1_32_rgba` source mix
+
+| source_set | rows |
+|---|---:|
+| itch.io free pixel art | 1,859,029 |
+| NathMen12 MC text-to-image | 1,034,057 |
+| alucard pixel sprites | 282,044 |
+| OpenGameArt (OGA-BY 3.0) | 4,555 |
+| Kenney pixel assets | 4,312 |
+| Kaggle pixel art | 1,722 |
+
+Minecraft rows are fully opaque; pixel-art rows keep their original alpha
+channel (transparent backgrounds are **not** composited onto black).
+
+## File format
+
+Each mmap dataset directory contains:
+
+```text
+<name>/
+├── images.uint8.mmap   # raw little-endian uint8, C-order (N, H, W, C)
+├── metadata.parquet    # one row per image + provenance/prompt fields
+├── splits.json         # {"train": [idx...], "val": [...], "test": [...]}
+└── build_summary.json  # counts and source breakdown
+```
+
+`images.uint8.mmap` is a headerless NumPy array. Load it with:
+
+```python
+import numpy as np
+n, size, channels = 3_185_719, 32, 4
+imgs = np.memmap(
+    "data/build/stage1_32_rgba/images.uint8.mmap",
+    dtype=np.uint8, mode="r", shape=(n, size, size, channels),
+)
+```
+
+`metadata.parquet` columns for the unified datasets:
+
+| column | meaning |
+|---|---|
+| `index` | row index into the mmap |
+| `source_set` | originating processed set (see table above) |
+| `weak_prompt` | short text caption (MC filename/label or generic pixel-art) |
+| `source_metadata` | JSON blob with original filename, project, license, etc. |
+
+The processed `*32` tile folders instead contain `tiles/<sha>.png` plus a
+`manifest.jsonl` and `summary.json`.
+
+## Download
+
+```bash
+pip install -U "huggingface_hub[hf_xet]"
+
+# only the pretraining set
+hf download Risposta/MC_Gen \
+  --repo-type dataset \
+  --include "data/build/stage1_32_rgba/*" \
+  --local-dir .
+
+# everything (all four datasets)
+hf download Risposta/MC_Gen --repo-type dataset --local-dir .
+```
+
+With `--local-dir .` run from the project root, the files land exactly at the
+paths the training configs expect. A convenience wrapper is provided in the
+project repo as `scripts/download_dataset_hf.py`.
+
+## Provenance
+
+The datasets derive from the following sources (see `source_metadata` for
+per-sample details): NathMen12/16xModdedMinecraft-TextToImage, itch.io free
+pixel-art asset packs, Kenney CC0 packs, evilsocket/alucard-sprites, Kaggle
+ebrahimelgazar/pixel-art, nyuuzyou/OpenGameArt-OGA-BY-3.0,
+James-A/Minecraft-16x-Dataset, and Modrinth resource packs.
+
+This repository is **not affiliated with, endorsed by, or associated with**
+Microsoft, Mojang, or any asset author. All trademarks belong to their
+respective owners.
+
+## Citation
+
+```bibtex
+@misc{mcgen2,
+  title  = {MC-Gen 2.0: pixel-space flow transformer for Minecraft textures},
+  author = {Risposta},
+  year   = {2026},
+  url    = {https://github.com/jurky123/MC_Gen2.0}
+}
+```