seed-tts-eval

A preprocessed copy of the seed-tts-eval test set, used by SGLang Omni for TTS benchmarking (WER and speed evaluation).

We thank the researchers of ByteDance for releasing the original evaluation data and methodology. This dataset simply reorganizes their test sets into a single Hugging Face repository for convenience.

Evaluation Sets

This dataset contains 5 evaluation sets across English and Chinese:

#	File	Language	Samples	Columns	Difficulty	Description
1	en/meta.lst	English	1,088	4	Standard	Same-speaker voice cloning (CommonVoice)
2	zh/meta.lst	Chinese	2,020	4	Standard	Same-speaker voice cloning (DiDiSpeech-2)
3	en/non_para_reconstruct_meta.lst	English	1,086	5	Hard	Cross-speaker voice cloning
4	zh/non_para_reconstruct_meta.lst	Chinese	2,018	5	Hard	Cross-speaker voice cloning
5	zh/hardcase.lst	Chinese	400	4	Hard	Tongue twisters and repetition patterns

Sets 1 and 2 (en/meta.lst and zh/meta.lst) are the standard evaluation sets used by SGLang Omni benchmarks.

Note: Hugging Face may display ~5K samples on this page. That number comes from the auto-detected audiofolder format counting every .wav file (both prompt wavs and target wavs) individually. The actual evaluation sample counts are listed in the table above.

File Format

Standard sets (4 columns)

In en/meta.lst, zh/meta.lst, and zh/hardcase.lst, each line contains the following columns:

utterance_id | prompt_text | prompt_wav_path | target_text

Column	Description
utterance_id	Unique sample identifier
prompt_text	Transcript of the prompt (reference) audio
prompt_wav_path	Relative path to the prompt audio file (e.g., prompt-wavs/xxx.wav)
target_text	Text to be synthesized by the TTS model

common_voice_en_10119832-common_voice_en_10119840|We asked over twenty different people, and they all said it was his.|prompt-wavs/common_voice_en_10119832.wav|Get the trust fund to the bank early.

Cross-speaker sets (5 columns)

In en/non_para_reconstruct_meta.lst and zh/non_para_reconstruct_meta.lst, each line contains the following columns:

utterance_id | prompt_text | prompt_wav_path | target_text | target_wav_path

In addition to the 4 columns, these files have an additional 5th column:

Column	Description
target_wav_path	Relative path to the ground-truth target audio (for reconstruction-based evaluation)

In cross-speaker sets, the prompt speaker and the target speaker are different people, making voice cloning significantly harder.

Set Details

English Standard (en/meta.lst)

1,088 samples from CommonVoice. The prompt audio and the target text come from the same speaker, testing parallel (same-speaker) voice cloning.

Chinese Standard (zh/meta.lst)

2,020 samples from DiDiSpeech-2. Same-speaker voice cloning, analogous to the English set.

English Cross-Speaker (en/non_para_reconstruct_meta.lst)

1,086 samples. The prompt and target are from different speakers -- the model must synthesize the target text in the prompt speaker's voice, without having heard that speaker say anything similar. Shares the same target texts as set 1.

Chinese Cross-Speaker (zh/non_para_reconstruct_meta.lst)

2,018 samples. Cross-speaker Chinese evaluation, analogous to set 3. Shares the same target texts as set 2.

Chinese Hard Cases (zh/hardcase.lst)

400 samples split into two categories:

• Tongue twisters (绕口令, raokouling-*): 200 samples with phonetically challenging sentences designed to stress-test pronunciation accuracy.
• Repetition patterns: 200 samples with repetitive or stutter-prone text patterns.

Usage

# Download the full dataset
huggingface-cli download zhaochenyang20/seed-tts-eval \
    --repo-type dataset --local-dir seedtts_testset

For CI testing, a minimal subset is available at zhaochenyang20/seed-tts-eval-mini.

Directory Structure

seed-tts-eval/
├── en/
│   ├── meta.lst                         # Standard English eval (1,088 samples)
│   ├── non_para_reconstruct_meta.lst    # Cross-speaker English eval (1,086 samples)
│   ├── prompt-wavs/                     # Reference audio clips (1,007 files)
│   └── wavs/                            # Ground-truth target audio (1,092 files)
└── zh/
    ├── meta.lst                         # Standard Chinese eval (2,020 samples)
    ├── non_para_reconstruct_meta.lst    # Cross-speaker Chinese eval (2,018 samples)
    ├── hardcase.lst                     # Tongue twisters + repetition (400 samples)
    ├── prompt-wavs/                     # Reference audio clips (1,010 files)
    └── wavs/                            # Ground-truth target audio (2,020 files)

Citation

If you use this dataset, please cite the original seed-tts-eval work:

@article{anastassiou2024seed,
  title={Seed-TTS: A Family of High-Quality Versatile Speech Generation Models},
  author={Anastassiou, Philip and others},
  journal={arXiv preprint arXiv:2406.02430},
  year={2024}
}