voxcpm 2.0.3

VoxCPM: Tokenizer-Free TTS for Context-Aware Speech Generation and True-to-Life Voice Cloning

VoxCPM2: Tokenizer-Free TTS for Multilingual Speech Generation, Creative Voice Design, and True-to-Life Cloning

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VoxCPM is a tokenizer-free Text-to-Speech system that directly generates continuous speech representations via an end-to-end diffusion autoregressive architecture, bypassing discrete tokenization to achieve highly natural and expressive synthesis.

VoxCPM2 is the latest major release — a 2B parameter model trained on over 2 million hours of multilingual speech data, now supporting 30 languages, Voice Design, Controllable Voice Cloning, and 48kHz studio-quality audio output. Built on a MiniCPM-4 backbone.

✨ Highlights

• 🌍 30-Language Multilingual — Input text in any of the 30 supported languages and synthesize directly, no language tag needed
• 🎨 Voice Design — Create a brand-new voice from a natural-language description alone (gender, age, tone, emotion, pace …), no reference audio required
• 🎛️ Controllable Cloning — Clone any voice from a short reference clip, with optional style guidance to steer emotion, pace, and expression while preserving the original timbre
• 🎙️ Ultimate Cloning — Reproduce every vocal nuance: provide both reference audio and its transcript, and the model continues seamlessly from the reference, faithfully preserving every vocal detail — timbre, rhythm, emotion, and style (same as VoxCPM1.5)
• 🔊 48kHz High-Quality Audio — Accepts 16kHz reference audio and directly outputs 48kHz studio-quality audio via AudioVAE V2's asymmetric encode/decode design, with built-in super-resolution — no external upsampler needed
• 🧠 Context-Aware Synthesis — Automatically infers appropriate prosody and expressiveness from text content
• ⚡ Real-Time Streaming — RTF as low as ~0.3 on NVIDIA RTX 4090, and ~0.13 accelerated by Nano-vLLM or vLLM-Omni — official vLLM omni-modal serving for VoxCPM2 with PagedAttention and an OpenAI-compatible API
• 📜 Fully Open-Source & Commercial-Ready — Weights and code released under the Apache-2.0 license, free for commercial use

🌍 Supported Languages (30)

Arabic, Burmese, Chinese, Danish, Dutch, English, Finnish, French, German, Greek, Hebrew, Hindi, Indonesian, Italian, Japanese, Khmer, Korean, Lao, Malay, Norwegian, Polish, Portuguese, Russian, Spanish, Swahili, Swedish, Tagalog, Thai, Turkish, Vietnamese

Chinese Dialect: 四川话, 粤语, 吴语, 东北话, 河南话, 陕西话, 山东话, 天津话, 闽南话

News

• [2026.04] 🔥 We release VoxCPM2 — 2B, 30 languages, Voice Design & Controllable Voice Cloning, 48kHz audio output! Weights | Docs | Playground
• [2025.12] 🎉 Open-source VoxCPM1.5 weights with SFT & LoRA fine-tuning. (🏆 #1 GitHub Trending)
• [2025.09] 🔥 Release VoxCPM Technical Report.
• [2025.09] 🎉 Open-source VoxCPM-0.5B weights (🏆 #1 HuggingFace Trending)

---

Contents

• Quick Start
  • Installation
  • Python API
  • CLI Usage
  • Web Demo
  • Production Deployment
• Models & Versions
• Performance
• Fine-tuning
• Documentation
• Ecosystem & Community
• Risks and Limitations
• Citation

---

🚀 Quick Start

Installation

pip install voxcpm

Requirements: Python ≥ 3.10 (<3.13), PyTorch ≥ 2.5.0, CUDA ≥ 12.0. See Quick Start Docs for details.

Python API

🗣️ Text-to-Speech

from voxcpm import VoxCPM
import soundfile as sf

model = VoxCPM.from_pretrained(
  "openbmb/VoxCPM2",
  load_denoiser=False,
)

wav = model.generate(
    text="VoxCPM2 is the current recommended release for realistic multilingual speech synthesis.",
    cfg_value=2.0,
    inference_timesteps=10,
)
sf.write("demo.wav", wav, model.tts_model.sample_rate)
print("saved: demo.wav")

If you prefer downloading from ModelScope first, you can use:

pip install modelscope

from modelscope import snapshot_download
snapshot_download("OpenBMB/VoxCPM2", local_dir='./pretrained_models/VoxCPM2') # specify the local directory to save the model

from voxcpm import VoxCPM
import soundfile as sf
model = VoxCPM.from_pretrained("./pretrained_models/VoxCPM2", load_denoiser=False)

wav = model.generate(
    text="VoxCPM2 is the current recommended release for realistic multilingual speech synthesis.",
    cfg_value=2.0,
    inference_timesteps=10,
)
sf.write("demo.wav", wav, model.tts_model.sample_rate)

🎨 Voice Design

Create a voice from a natural-language description — no reference audio needed. Format: put the description in parentheses at the start of text(e.g. "(your voice description)The text to synthesize."):

wav = model.generate(
    text="(A young woman, gentle and sweet voice)Hello, welcome to VoxCPM2!",
    cfg_value=2.0,
    inference_timesteps=10,
)
sf.write("voice_design.wav", wav, model.tts_model.sample_rate)

🎛️ Controllable Voice Cloning

Upload a reference audio. The model clones the timbre, and you can still use control instructions to adjust speed, emotion, or style.

wav = model.generate(
    text="This is a cloned voice generated by VoxCPM2.",
    reference_wav_path="path/to/voice.wav",
)
sf.write("clone.wav", wav, model.tts_model.sample_rate)

wav = model.generate(
    text="(slightly faster, cheerful tone)This is a cloned voice with style control.",
    reference_wav_path="path/to/voice.wav",
    cfg_value=2.0,
    inference_timesteps=10,
)
sf.write("controllable_clone.wav", wav, model.tts_model.sample_rate)

🎙️ Ultimate Cloning

Provide both the reference audio and its exact transcript for audio-continuation-based cloning with every vocal nuance reproduced. For maximum cloning similarity, pass the same reference clip to both reference_wav_path and prompt_wav_path as shown below:

wav = model.generate(
    text="This is an ultimate cloning demonstration using VoxCPM2.",
    prompt_wav_path="path/to/voice.wav",
    prompt_text="The transcript of the reference audio.",
    reference_wav_path="path/to/voice.wav", # optional, for better simliarity 
)
sf.write("hifi_clone.wav", wav, model.tts_model.sample_rate)

🔄 Streaming API

import numpy as np

chunks = []
for chunk in model.generate_streaming(
    text="Streaming text to speech is easy with VoxCPM!",
):
    chunks.append(chunk)
wav = np.concatenate(chunks)
sf.write("streaming.wav", wav, model.tts_model.sample_rate)

CLI Usage

# Voice design (no reference audio needed)
voxcpm design \
  --text "VoxCPM2 brings studio-quality multilingual speech synthesis." \
  --output out.wav

# Controllable voice cloning with style control
voxcpm design \
  --text "VoxCPM2 brings studio-quality multilingual speech synthesis." \
  --control "Young female voice, warm and gentle, slightly smiling" \
  --output out.wav

# Voice cloning (reference audio)
voxcpm clone \
  --text "This is a voice cloning demo." \
  --reference-audio path/to/voice.wav \
  --output out.wav

# Ultimate cloning (prompt audio + transcript)
voxcpm clone \
  --text "This is a voice cloning demo." \
  --prompt-audio path/to/voice.wav \
  --prompt-text "reference transcript" \
  --reference-audio path/to/voice.wav \ # optional, for better simliarity
  --output out.wav

# Batch processing
voxcpm batch --input examples/input.txt --output-dir outs

# Help
voxcpm --help

Web Demo

python app.py --port 8808  # then open in browser: http://localhost:8808

🚢 Production Deployment (Nano-vLLM)

For high-throughput serving, use Nano-vLLM-VoxCPM — a dedicated inference engine built on Nano-vLLM with concurrent request support and an async API.

pip install nano-vllm-voxcpm

from nanovllm_voxcpm import VoxCPM
import numpy as np, soundfile as sf

server = VoxCPM.from_pretrained(model="/path/to/VoxCPM", devices=[0])
chunks = list(server.generate(target_text="Hello from VoxCPM!"))
sf.write("out.wav", np.concatenate(chunks), 48000)
server.stop()

RTF as low as ~0.13 on NVIDIA RTX 4090 (vs ~0.3 with the standard PyTorch implementation), with support for batched concurrent requests and a FastAPI HTTP server. See the Nano-vLLM-VoxCPM repo for deployment details.

🏭 Production Serving (vLLM-Omni)

For production multi-tenant deployments, use vLLM-Omni — the official vLLM project's omni-modal extension with native VoxCPM2 support. PagedAttention KV cache, continuous batching, and a drop-in OpenAI-compatible /v1/audio/speech endpoint.

# Install from source (latest main — vllm-omni is rapidly evolving)
uv pip install vllm==0.19.0 --torch-backend=auto
git clone https://github.com/vllm-project/vllm-omni.git && cd vllm-omni
uv pip install -e .

See the vLLM-Omni installation guide for other platforms (ROCm, XPU, MUSA, NPU) and Docker images.

# Launch an OpenAI-compatible TTS server (--omni enables omni-modal serving)
vllm serve openbmb/VoxCPM2 --omni --port 8000

# Call it from any OpenAI client
curl http://localhost:8000/v1/audio/speech \
  -H "Content-Type: application/json" \
  -d '{"model":"openbmb/VoxCPM2","input":"Hello from VoxCPM2 on vLLM-Omni!","voice":"default"}' \
  --output out.wav

Built on the upstream vLLM scheduler, with batched concurrent requests, streaming chunk delivery, and multi-GPU deployment out of the box. See the VoxCPM2 example for full deployment recipes.

Full parameter reference, multi-scenario examples, and voice cloning tips → Quick Start Guide | Usage Guide | Cookbook

---

📦 Models & Versions

	VoxCPM2	VoxCPM1.5	VoxCPM-0.5B
Status	🟢 Latest	Stable	Legacy
Backbone Parameters	2B	0.6B	0.5B
Audio Sample Rate	48kHz	44.1kHz	16kHz
LM Token Rate	6.25Hz	6.25Hz	12.5Hz
Languages	30	2 (zh, en)	2 (zh, en)
Cloning Mode	Isolated Reference & Continuation	Continuation only	Continuation only
Voice Design	✅	—	—
Controllable Voice Cloning	✅	—	—
SFT / LoRA	✅	✅	✅
RTF (RTX 4090)	~0.30	~0.15	~0.17
RTF in Nano-VLLM (RTX 4090)	~0.13	~0.08	~0.10
VRAM	~8 GB	~6 GB	~5 GB
Weights	🤗 HF / MS	🤗 HF / MS	🤗 HF / MS
Technical Report	Coming soon	—	arXiv ICLR 2026
Demo Page	Audio Samples	—	Audio Samples

VoxCPM2 is built on a tokenizer-free, diffusion autoregressive paradigm. The model operates entirely in the latent space of AudioVAE V2, following a four-stage pipeline: LocEnc → TSLM → RALM → LocDiT, enabling rich expressiveness and 48kHz native audio output.

For full architectural details, VoxCPM2-specific upgrades, and a model comparison table, see the Architecture Design.

---

📊 Performance

VoxCPM2 achieves state-of-the-art or comparable results on public zero-shot and controllable TTS benchmarks.

Seed-TTS-eval

Seed-TTS-eval WER(⬇)&SIM(⬆) Results (click to expand)

Model	Parameters	Open-Source	test-EN		test-ZH		test-Hard
			WER/%⬇	SIM/%⬆	CER/%⬇	SIM/%⬆	CER/%⬇	SIM/%⬆
MegaTTS3	0.5B	❌	2.79	77.1	1.52	79.0	-	-
DiTAR	0.6B	❌	1.69	73.5	1.02	75.3	-	-
CosyVoice3	0.5B	❌	2.02	71.8	1.16	78.0	6.08	75.8
CosyVoice3	1.5B	❌	2.22	72.0	1.12	78.1	5.83	75.8
Seed-TTS	-	❌	2.25	76.2	1.12	79.6	7.59	77.6
MiniMax-Speech	-	❌	1.65	69.2	0.83	78.3	-	-
F5-TTS	0.3B	✅	2.00	67.0	1.53	76.0	8.67	71.3
MaskGCT	1B	✅	2.62	71.7	2.27	77.4	-	-
CosyVoice	0.3B	✅	4.29	60.9	3.63	72.3	11.75	70.9
CosyVoice2	0.5B	✅	3.09	65.9	1.38	75.7	6.83	72.4
SparkTTS	0.5B	✅	3.14	57.3	1.54	66.0	-	-
FireRedTTS	0.5B	✅	3.82	46.0	1.51	63.5	17.45	62.1
FireRedTTS-2	1.5B	✅	1.95	66.5	1.14	73.6	-	-
Qwen2.5-Omni	7B	✅	2.72	63.2	1.70	75.2	7.97	74.7
Qwen3-Omni	30B-A3B	✅	1.39	-	1.07	-	-	-
OpenAudio-s1-mini	0.5B	✅	1.94	55.0	1.18	68.5	23.37	64.3
IndexTTS2	1.5B	✅	2.23	70.6	1.03	76.5	7.12	75.5
VibeVoice	1.5B	✅	3.04	68.9	1.16	74.4	-	-
HiggsAudio-v2	3B	✅	2.44	67.7	1.50	74.0	55.07	65.6
VoxCPM-0.5B	0.6B	✅	1.85	72.9	0.93	77.2	8.87	73.0
VoxCPM1.5	0.8B	✅	2.12	71.4	1.18	77.0	7.74	73.1
MOSS-TTS		✅	1.85	73.4	1.20	78.8	-	-
Qwen3-TTS	1.7B	✅	1.23	71.7	1.22	77.0	6.76	74.8
FishAudio S2	4B	✅	0.99	-	0.54	-	5.99	-
LongCat-Audio-DiT	3.5B	✅	1.50	78.6	1.09	81.8	6.04	79.7
VoxCPM2	2B	✅	1.84	75.3	0.97	79.5	8.13	75.3

CV3-eval

CV3-eval Multilingual WER/CER(⬇) Results (click to expand)

Model	zh	en	hard-zh	hard-en	ja	ko	de	es	fr	it	ru
CosyVoice2	4.08	6.32	12.58	11.96	9.13	19.7	-	-	-	-	-
CosyVoice3-1.5B	3.91	4.99	9.77	10.55	7.57	5.69	6.43	4.47	11.8	10.5	6.64
Fish Audio S2	2.65	2.43	9.10	4.40	3.96	2.76	2.22	2.00	6.26	2.04	2.78
VoxCPM2	3.65	5.00	8.55	8.48	5.96	5.69	4.77	3.80	9.85	4.25	5.21

MiniMax-Multilingual-Test

Minimax-MLS-test WER(⬇) Results (click to expand)

Language	Minimax	ElevenLabs	Qwen3-TTS	FishAudio S2	VoxCPM2
Arabic	1.665	1.666	–	3.500	13.046
Cantonese	34.111	51.513	–	30.670	38.584
Chinese	2.252	16.026	0.928	0.730	1.136
Czech	3.875	2.108	–	2.840	24.132
Dutch	1.143	0.803	–	0.990	0.913
English	2.164	2.339	0.934	1.620	2.289
Finnish	4.666	2.964	–	3.330	2.632
French	4.099	5.216	2.858	3.050	4.534
German	1.906	0.572	1.235	0.550	0.679
Greek	2.016	0.991	–	5.740	2.844
Hindi	6.962	5.827	–	14.640	19.699
Indonesian	1.237	1.059	–	1.460	1.084
Italian	1.543	1.743	0.948	1.270	1.563
Japanese	3.519	10.646	3.823	2.760	4.628
Korean	1.747	1.865	1.755	1.180	1.962
Polish	1.415	0.766	–	1.260	1.141
Portuguese	1.877	1.331	1.526	1.140	1.938
Romanian	2.878	1.347	–	10.740	21.577
Russian	4.281	3.878	3.212	2.400	3.634
Spanish	1.029	1.084	1.126	0.910	1.438
Thai	2.701	73.936	–	4.230	2.961
Turkish	1.52	0.699	–	0.870	0.817
Ukrainian	1.082	0.997	–	2.300	6.316
Vietnamese	0.88	73.415	–	7.410	3.307

Minimax-MLS-test SIM(⬆) Results (click to expand)

Language	Minimax	ElevenLabs	Qwen3-TTS	FishAudio S2	VoxCPM2
Arabic	73.6	70.6	–	75.0	79.1
Cantonese	77.8	67.0	–	80.5	83.5
Chinese	78.0	67.7	79.9	81.6	82.5
Czech	79.6	68.5	–	79.8	78.3
Dutch	73.8	68.0	–	73.0	80.8
English	75.6	61.3	77.5	79.7	85.4
Finnish	83.5	75.9	–	81.9	89.0
French	62.8	53.5	62.8	69.8	73.5
German	73.3	61.4	77.5	76.7	80.3
Greek	82.6	73.3	–	79.5	86.0
Hindi	81.8	73.0	–	82.1	85.6
Indonesian	72.9	66.0	–	76.3	80.0
Italian	69.9	57.9	81.7	74.7	78.0
Japanese	77.6	73.8	78.8	79.6	82.8
Korean	77.6	70.0	79.9	81.7	83.3
Polish	80.2	72.9	–	81.9	88.4
Portuguese	80.5	71.1	81.7	78.1	83.7
Romanian	80.9	69.9	–	73.3	79.7
Russian	76.1	67.6	79.2	79.0	81.1
Spanish	76.2	61.5	81.4	77.6	83.1
Thai	80.0	58.8	–	78.6	84.0
Turkish	77.9	59.6	–	83.5	87.1
Ukrainian	73.0	64.7	–	74.7	79.8
Vietnamese	74.3	36.9	–	74.0	80.6

Internal 30-Language ASR Benchmark

We additionally run an internal multilingual intelligibility benchmark with 30 languages × 500 samples. ASR transcription is evaluated via Gemini 3.1 Flash Lite API.

Internal 30-Language ASR Benchmark (click to expand)

Language	Metric	VoxCPM2	Fish S2-Pro
ar (Arabic)	CER	1.23%	0.30%
da (Danish)	WER	2.70%	3.52%
de (German)	WER	0.96%	0.64%
el (Greek)	WER	3.17%	4.61%
en (English)	WER	0.42%	1.03%
es (Spanish)	WER	1.33%	0.64%
fi (Finnish)	WER	2.24%	2.80%
fr (French)	WER	2.16%	2.34%
he (Hebrew)	CER	2.98%	15.27%
hi (Hindi)	CER	0.79%	0.91%
id (Indonesian)	WER	1.36%	1.68%
it (Italian)	WER	1.65%	1.08%
ja (Japanese)	CER	2.40%	1.82%
km (Khmer)	CER	2.05%	75.15%
ko (Korean)	CER	0.95%	0.29%
lo (Lao)	CER	1.90%	87.40%
ms (Malay)	WER	1.75%	1.41%
my (Burmese)	CER	1.42%	85.27%
nl (Dutch)	WER	1.25%	1.68%
no (Norwegian)	WER	2.49%	3.76%
pl (Polish)	WER	1.90%	1.65%
pt (Portuguese)	WER	1.48%	1.49%
ru (Russian)	WER	0.90%	0.86%
sv (Swedish)	WER	2.22%	2.63%
sw (Swahili)	CER	1.07%	2.02%
th (Thai)	CER	0.94%	1.92%
tl (Tagalog)	WER	2.63%	4.00%
tr (Turkish)	WER	1.65%	1.65%
vi (Vietnamese)	WER	1.56%	5.56%
zh (Chinese)	CER	0.92%	1.02%
Average (30 languages)		1.68%	-

InstructTTSEval

Instruction-Guided Voice Design Results (click to expand)

Model	InstructTTSEval-ZH			InstructTTSEval-EN
	APS⬆	DSD⬆	RP⬆	APS⬆	DSD⬆	RP⬆
Hume	–	–	–	83.0	75.3	54.3
VoxInstruct	47.5	52.3	42.6	54.9	57.0	39.3
Parler-tts-mini	–	–	–	63.4	48.7	28.6
Parler-tts-large	–	–	–	60.0	45.9	31.2
PromptTTS	–	–	–	64.3	47.2	31.4
PromptStyle	–	–	–	57.4	46.4	30.9
VoiceSculptor	75.7	64.7	61.5	–	–	–
Mimo-Audio-7B-Instruct	75.7	74.3	61.5	80.6	77.6	59.5
Qwen3TTS-12Hz-1.7B-VD	85.2	81.1	65.1	82.9	82.4	68.4
VoxCPM2	85.2	71.5	60.8	84.2	83.2	71.4

---

⚙️ Fine-tuning

VoxCPM supports both full fine-tuning (SFT) and LoRA fine-tuning. With as little as 5–10 minutes of audio, you can adapt to a specific speaker, language, or domain.

# LoRA fine-tuning (parameter-efficient, recommended)
python scripts/train_voxcpm_finetune.py \
    --config_path conf/voxcpm_v2/voxcpm_finetune_lora.yaml

# Full fine-tuning
python scripts/train_voxcpm_finetune.py \
    --config_path conf/voxcpm_v2/voxcpm_finetune_all.yaml

# WebUI for training & inference
python lora_ft_webui.py   # then open http://localhost:7860

Full guide → Fine-tuning Guide (data preparation, configuration, training, LoRA hot-swapping, FAQ)

---

📚 Documentation

Full documentation: voxcpm.readthedocs.io

Topic	Link
Quick Start & Installation	Quick Start
Usage Guide & Cookbook	User Guide
VoxCPM Series	Models
Fine-tuning (SFT & LoRA)	Fine-tuning Guide
FAQ & Troubleshooting	FAQ

---

🌟 Ecosystem & Community

Project	Description
Nano-vLLM	High-throughput and Fast GPU serving
vLLM-Omni	Official vLLM omni-modal serving for VoxCPM2 — PagedAttention, OpenAI-compatible API
VoxCPM.cpp	GGML/GGUF: CPU, CUDA, Vulkan inference
VoxCPM-ONNX	ONNX export for CPU inference
VoxCPMANE	Apple Neural Engine backend
voxcpm_rs	Rust re-implementation
ComfyUI-VoxCPM	ComfyUI node-based workflows
ComfyUI_RH_VoxCPM	Feature-complete ComfyUI workflow for VoxCPM 2 with multi-speaker generation, LoRA, and auto-ASR
ComfyUI-VoxCPMTTS	ComfyUI TTS extension
TTS WebUI	Browser-based TTS extension

See the full Ecosystem in the docs. Community projects are not officially maintained by OpenBMB. Built something cool? Open an issue or PR to add it!

---

⚠️ Risks and Limitations

• Potential for Misuse: VoxCPM's voice cloning can generate highly realistic synthetic speech. It is strictly forbidden to use VoxCPM for impersonation, fraud, or disinformation. We strongly recommend clearly marking any AI-generated content.
• Controllable Generation Stability: Voice Design and Controllable Voice Cloning results can vary between runs — you may try to generate 1~3 times to obtain the desired voice or style. We are actively working on improving controllability consistency.
• Language Coverage: VoxCPM2 officially supports 30 languages. For languages not on the list, you are welcome to test directly or try fine-tuning on your own data. We plan to expand language coverage in future releases.
• Usage: This model is released under the Apache-2.0 license. For production deployments, we recommend conducting thorough testing and safety evaluation tailored to your use case.

---

📖 Citation

If you find VoxCPM helpful, please consider citing our work and starring ⭐ the repository!

@article{voxcpm2_2026,
  title   = {VoxCPM2: Tokenizer-Free TTS for Multilingual Speech Generation, Creative Voice Design, and True-to-Life Cloning},
  author  = {VoxCPM Team},
  journal = {GitHub},
  year    = {2026},
}

@article{voxcpm2025,
  title   = {VoxCPM: Tokenizer-Free TTS for Context-Aware Speech Generation
             and True-to-Life Voice Cloning},
  author  = {Zhou, Yixuan and Zeng, Guoyang and Liu, Xin and Li, Xiang and
             Yu, Renjie and Wang, Ziyang and Ye, Runchuan and Sun, Weiyue and
             Gui, Jiancheng and Li, Kehan and Wu, Zhiyong and Liu, Zhiyuan},
  journal = {arXiv preprint arXiv:2509.24650},
  year    = {2025},
}

📄 License

VoxCPM model weights and code are open-sourced under the Apache-2.0 license.

🙏 Acknowledgments

• DiTAR for the diffusion autoregressive backbone
• MiniCPM-4 for the language model foundation
• CosyVoice for the Flow Matching-based LocDiT implementation
• DAC for the Audio VAE backbone
• Our community users for trying VoxCPM, reporting issues, sharing ideas, and contributing—your support helps the project keep getting better

Institutions

ModelBest     THUHCSI

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