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MERT-v2-30s
Supbatomic/MERT-v2-30s
MERT-v2-30s is a feature extraction model from Supbatomic. Use it when you need embeddings to search or compare text. It is set up for transformers. The card lists the license as cc-by-nc-4.0.
<h1 align="center"🤗 MERT-v2-30s</h1 <p align="center"<strongMusic representations from short audio clips</strong</p <p align="center"24 kHz mono · 632M parameters · 24 layers · 1,024 dimensions · 25 Hz</p
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At a glance
- Task
- Feature Extraction
- Library
- transformers
- License
- cc-by-nc-4.0
- Model type
- mert2
- Access
- Public
- Created
- Sep 14, 2026
- Updated
- Sep 14, 2026
- SHA
- 370c08df
Model card
From the Hugging Face model README
<h1 align="center">🤗 MERT-v2-30s</h1>
<p align="center"><strong>Music representations from short audio clips</strong></p>
<p align="center">24 kHz mono · 632M parameters · 24 layers · 1,024 dimensions · 25 Hz</p>
<p align="center">
<a href="https://map-yue2.github.io/">🎵 YuE2 project</a>
·
<a href="#quick-start">🚀 Quick start</a>
·
<a href="#marble">📊 MARBLE</a>
·
<a href="#layer-guide">🎛️ Layer guide</a>
·
<a href="#citation">📚 Citation</a>
</p>
<p align="center">
<a href="https://huggingface.co/m-a-p/MERT-v2-30s"><img alt="MERT-v2-30s" src="https://img.shields.io/badge/MERT--v2--30s-374151?logo=huggingface&logoColor=FFD21E" height="20" /></a>
<a href="https://huggingface.co/m-a-p/MERT-v2-FullSong"><img alt="MERT-v2-FullSong" src="https://img.shields.io/badge/MERT--v2--FullSong-374151?logo=huggingface&logoColor=FFD21E" height="20" /></a>
<a href="https://huggingface.co/m-a-p/YuE2-3B"><img alt="YuE2-3B" src="https://img.shields.io/badge/YuE2--3B-374151?logo=huggingface&logoColor=FFD21E" height="20" /></a>
<a href="https://huggingface.co/m-a-p/YuE2-Vae"><img alt="🤗 YuE2-Vae" src="https://img.shields.io/badge/YuE2--Vae-374151?logo=huggingface&logoColor=FFD21E" height="20" /></a>
<a href="https://huggingface.co/m-a-p/YuE2-Vae-legacy"><img alt="🤗 YuE2-Vae-legacy" src="https://img.shields.io/badge/YuE2--Vae--legacy-374151?logo=huggingface&logoColor=FFD21E" height="20" /></a>
<a href="https://huggingface.co/datasets/m-a-p/WildSongBench"><img alt="🤗 WildSongBench" src="https://img.shields.io/badge/WildSongBench-374151?logo=huggingface&logoColor=FFD21E" height="20" /></a>
<a href="https://huggingface.co/m-a-p/SheetSage2"><img alt="SheetSage2" src="https://img.shields.io/badge/SheetSage2-374151?logo=huggingface&logoColor=FFD21E" height="20" /></a>
</p>
MERT-v2-30s is a bidirectional music encoder pretrained on 30-second excerpts. Extract general-purpose music representations at the frame or recording level. Load with standard Hugging Face Transformers, using the familiar MERT workflow.
For complete recordings, use MERT-v2-FullSong, which continues pretraining on full songs.
MERT-v2-30s uses the bidirectional backbone in (B); MERT-v2-FullSong continues through the full-song branch in (C). The causal branch is used for YuE2 tokenization.
<a id="quick-start"></a>
🚀 Quick start
Install the matching PyTorch packages:
python -m pip install torch==2.6.0 torchaudio==2.6.0 transformers==4.53.2 huggingface-hub safetensors soundfile
import soundfile as sf
import torch
import torchaudio.functional as AF
from transformers import AutoFeatureExtractor, AutoModel
repo = "m-a-p/MERT-v2-30s"
device = "cuda" if torch.cuda.is_available() else "cpu"
processor = AutoFeatureExtractor.from_pretrained(repo, trust_remote_code=True)
model = AutoModel.from_pretrained(repo, trust_remote_code=True).eval().to(device)
audio, sr = sf.read("music.wav", dtype="float32", always_2d=True)
audio = audio[:30 * sr].mean(axis=1) # First 30 seconds, mixed to mono.
waveform = AF.resample(torch.from_numpy(audio), sr, processor.sampling_rate)
inputs = processor(
waveform.numpy(), sampling_rate=processor.sampling_rate, return_tensors="pt",
).to(device)
with torch.inference_mode():
output = model(**inputs, output_hidden_states=True)
frames = output.last_hidden_state # [batch, frames, 1024], 25 Hz
layers = output.hidden_states # 24 tensors, one per block
mask = output.feature_attention_mask[..., None]
embedding = (frames * mask).sum(1) / mask.sum(1).clamp_min(1) # [batch, 1024]
hidden_states[0] is block 1; hidden_states[23] is block 24. For full songs, switch to MERT-v2-FullSong and remove the audio slice.
<a id="marble"></a>
📊 MARBLE
Reported frozen-encoder results on MARBLE. All scores are multiplied by 100; higher is better. Bold marks the best displayed value in each column, including ties.
Baseline scores and parameter counts are reproduced from Tables III and V of PupuJEPA; the baselines were not rerun for this release. Evaluation protocols may differ across sources.
General music understanding. MTT = MagnaTagATune; key = GiantSteps refined key accuracy; genre and beat = GTZAN; valence and arousal = EmoMusic. ROC = ROC-AUC; AP = average precision.
| Model | Params | MTT ROC | MTT AP | Key acc. | Genre acc. | Beat F1 | Valence R² | Arousal R² |
|---|---|---|---|---|---|---|---|---|
| MERT-Large | 330M | 90.6 | 37.9 | 64.1 | 77.6 | 86.8 | 56.7 | 76.1 |
| Dasheng-1.2B | 1.2B | 91.5 | 40.4 | 58.0 | 81.4 | 87.7 | 57.4 | 75.0 |
| MuQ | 310M | 90.5 | 38.5 | 63.2 | 83.8 | 90.1 | 58.3 | 76.4 |
| MusicFM | 330M | 90.9 | 38.3 | 63.0 | 84.1 | 90.2 | 57.2 | 74.4 |
| AudioMAE++ | 307M | 91.2 | 39.5 | 61.7 | 80.3 | 90.0 | 59.0 | 75.7 |
| MATPAC++ | 307M | 90.6 | 38.2 | 63.7 | 81.4 | 90.1 | 57.8 | 74.7 |
| A-JEPA | 307M | 91.0 | 39.2 | 65.0 | 83.8 | 90.0 | 57.4 | 74.8 |
| PupuJEPA-Large | 307M | 91.7 | 40.8 | 66.1 | 86.9 | 91.0 | 62.5 | 76.8 |
| PupuJEPA-Huge | 632M | 91.3 | 39.7 | 64.8 | 85.9 | 90.5 | 62.0 | 78.5 |
| MERT-v2-30s | 632M | 91.91 | 41.29 | 66.97 | 91.72 | 90.59 | 63.23 | 80.01 |
| MERT-v2-FullSong | 632M | 91.74 | 41.20 | 67.05 | 90.69 | 90.57 | 63.52 | 78.14 |
MTG-Jamendo tagging. Mood denotes mood/theme tags.
| Model | Params | Instrument ROC | Instrument AP | Mood ROC | Mood AP | Genre ROC | Genre AP | Top-50 ROC | Top-50 AP |
|---|---|---|---|---|---|---|---|---|---|
| MERT-Large | 330M | 75.5 | 18.8 | 75.3 | 13.5 | 86.1 | 18.0 | 82.6 | 29.1 |
| Dasheng-1.2B | 1.2B | 75.0 | 19.0 | 76.1 | 15.5 | 85.5 | 18.8 | 82.4 | 29.6 |
| MuQ | 310M | 74.8 | 19.1 | 73.7 | 13.2 | 85.4 | 19.1 | 83.0 | 30.2 |
| MusicFM | 330M | 74.6 | 18.5 | 74.9 | 14.1 | 85.3 | 19.4 | 81.9 | 29.7 |
| AudioMAE++ | 307M | 77.1 | 19.9 | 75.6 | 14.0 | 86.3 | 18.9 | 83.1 | 31.1 |
| MATPAC++ | 307M | 77.2 | 19.7 | 75.1 | 14.1 | 85.7 | 19.6 | 82.5 | 30.2 |
| A-JEPA | 307M | 76.6 | 19.3 | 74.6 | 14.3 | 85.5 | 19.2 | 82.5 | 29.6 |
| PupuJEPA-Large | 307M | 78.4 | 21.2 | 76.2 | 15.3 | 86.1 | 20.1 | 82.8 | 30.5 |
| PupuJEPA-Huge | 632M | 77.6 | 20.5 | 75.9 | 14.7 | 85.9 | 20.1 | 83.1 | 30.7 |
| MERT-v2-30s | 632M | 80.27 | 22.89 | 79.44 | 16.68 | 88.01 | 21.22 | 84.18 | 32.17 |
| MERT-v2-FullSong | 632M | 80.27 | 23.51 | 78.74 | 15.74 | 87.98 | 20.66 | 84.13 | 31.62 |
Supplemental: Chords1217 frame accuracy is 78.48 for MERT-v2-30s and 77.79 for MERT-v2-FullSong.
<!-- mert2-hf-validation:start -->HF reproduction verified: Both models reproduce all ten MARBLE tasks with the fixed evaluation settings. Scores and best settings.
<!-- mert2-hf-validation:end --><a id="layer-guide"></a>
🎛️ Layer guide
Recommended probe settings with the encoder frozen. L1 = hidden_states[0]; All-layer MLP uses all 24 layers.
| Task / dataset | MERT-v2-30s layer | Probe LR | MERT-v2-FullSong layer | Probe LR |
|---|---|---|---|---|
| Genre · GTZAN | L23 | 5e-3 | L24 | 5e-4 |
| Beat · GTZAN | L21 | 1e-3 | L23 | 1e-3 |
| Key · GiantSteps | L4 | 1e-3 | L23 | 1e-3 |
| Emotion · EmoMusic | All-layer MLP | 5e-5 | L24 | 5e-4 |
| Chords · Chords1217 | All-layer MLP | 1e-4 | All-layer MLP | 5e-4 |
| Tagging · MagnaTagATune | L22 | 1e-3 | L23 | 1e-3 |
| Instrument · MTG-Jamendo | L14 | 1e-3 | L12 | 1e-3 |
| Mood/theme · MTG-Jamendo | L16 | 1e-3 | L13 | 1e-3 |
| Genre · MTG-Jamendo | L19 | 1e-3 | L16 | 1e-3 |
| Top-50 · MTG-Jamendo | L13 | 1e-3 | L22 | 1e-3 |
<a id="citation"></a>
📚 Citation
Technical report coming soon. For now, please cite MERT (ICLR 2024) and MARBLE (NeurIPS 2023) when using MERT-v2 or its benchmark results in your research.
@inproceedings{li2024mert,
title = {MERT: Acoustic Music Understanding Model with Large-Scale Self-supervised Training},
author = {Li, Yizhi and Yuan, Ruibin and Zhang, Ge and Ma, Yinghao and Chen, Xingran and Yin, Hanzhi and Xiao, Chenghao and Lin, Chenghua and Ragni, Anton and Benetos, Emmanouil and Gyenge, Norbert and Dannenberg, Roger and Liu, Ruibo and Chen, Wenhu and Xia, Gus and Shi, Yemin and Huang, Wenhao and Wang, Zili and Guo, Yike and Fu, Jie},
booktitle = {International Conference on Learning Representations},
year = {2024},
url = {https://proceedings.iclr.cc/paper_files/paper/2024/hash/33dffa2e3d2ab74a783d1a8c292f66d9-Abstract-Conference.html}
}
@inproceedings{yuan2023marble,
title = {MARBLE: Music Audio Representation Benchmark for Universal Evaluation},
author = {Yuan, Ruibin and Ma, Yinghao and Li, Yizhi and Zhang, Ge and Chen, Xingran and Yin, Hanzhi and Zhuo, Le and Liu, Yiqi and Huang, Jiawen and Tian, Zeyue and Deng, Binyue and Wang, Ningzhi and Lin, Chenghua and Benetos, Emmanouil and Ragni, Anton and Gyenge, Norbert and Dannenberg, Roger and Chen, Wenhu and Xia, Gus and Xue, Wei and Liu, Si and Wang, Shi and Liu, Ruibo and Guo, Yike and Fu, Jie},
booktitle = {Advances in Neural Information Processing Systems},
volume = {36},
pages = {39626--39647},
year = {2023},
doi = {10.52202/075280-1722},
url = {https://proceedings.neurips.cc/paper_files/paper/2023/hash/7cbeec46f979618beafb4f46d8f39f36-Abstract-Datasets_and_Benchmarks.html}
}
Weights: CC BY-NC 4.0. Dependency notices.
YuE2 family: Song generation · Audio decoder · Benchmark decoder.
- Task
- Feature Extraction
- Library
- transformers
- Type
- mert2
- License
- cc-by-nc-4.0
- Created
- Sep 14, 2026
- Updated
- Sep 14, 2026