FlaxSpeaker: vox_ecapa_tdnn_small_ext_softmax (ecapa_tdnn - small)

Disclaimer & Open-Source Reproduction Notice

This is not an officially supported Google product.

This model checkpoint and the accompanying FlaxSpeaker library are an independent, clean-room open-source reproduction in JAX/Flax of speaker recognition algorithms published in:

• GE2E: Generalized End-to-End Loss for Speaker Verification (arXiv:1710.10467)
• Dr-Vectors: Decision Residual Networks and an Improved Loss for Speaker Recognition (arXiv:2104.01989)
• Conformer-ATP: Attentive Temporal Pooling for Conformer-based Streaming Language Identification in Long-form Speech (arXiv:2202.12163)
• PFAS: Parameter-Free Attentive Scoring for Speaker Verification (arXiv:2203.05642v3)

The experiments in those original papers were conducted using Google's proprietary internal infrastructure and internal datasets, not this open-source library or public dataset split.

Model Summary

Property	Value
Model ID	vox_ecapa_tdnn_small_ext_softmax
Hugging Face Repository	wq2012/vox_ecapa_tdnn_small_ext_softmax
Hugging Face Collection	FlaxSpeaker Collection
GitHub Repository	wq2012/FlaxSpeaker
PyPI Package	flaxspeaker
Backbone Architecture	ecapa_tdnn (small)
Temporal Pooling	asp
Training Loss	extended_set_softmax
Verification Scoring	cosine
Output Embedding Dim	192
Encoder Parameters	1,684,418
Training Domain	voxceleb1
Audio Frontend	80-dim log_mel @ 16000 Hz + Energy VAD + CMVN

Model Files Included

• model.safetensors: Primary model weights in SafeTensors format
• flax_model.msgpack: Native Flax Msgpack serialized parameters
• config.json: FlaxSpeakerConfig model & training architecture configuration
• preprocessor_config.json: WhisperFeatureExtractor-compatible frontend configuration
• eval_results.json: Verified multi-domain evaluation metrics (1-utt & 3-utt EER, minDCF, ROC-AUC, 95% bootstrap CIs)

Quickstart Usage

Python API (from Hugging Face Hub or Local Directory)

from flaxspeaker import load_pretrained

model = load_pretrained("wq2012/vox_ecapa_tdnn_small_ext_softmax")
emb = model.extract_embedding("path/to/utterance.flac")
score = model.verify("path/to/enroll.flac", "path/to/test.flac")
print(f"Embedding shape: {emb.shape}, Verification score: {score:.4f}")

Command-Line Inference

python scripts/inference.py --model_dir wq2012/vox_ecapa_tdnn_small_ext_softmax \
    --enroll_audio path/to/enroll.flac --test_audio path/to/test.flac

Multi-Domain Evaluation Results

1-Utterance Verification Across Evaluation Domains

Evaluation Split	Trials	EER (%)	95% Bootstrap CI (%)	minDCF@0.01	minDCF@0.10	ROC-AUC
LibriSpeech (English Read)	3,000	20.07%	[18.52, 21.55]	0.9860	0.9553	0.8815
CN-Celeb2 (Chinese Multi-Genre)	3,000	32.40%	[30.58, 34.05]	0.9973	0.9840	0.7473
VoxCeleb1 (In-the-Wild Celebrity)	2,000	21.10%	[19.30, 23.30]	0.9940	0.9510	0.8690
Universal Pooled (All 3 Domains)	8,000	24.57%	[23.73, 25.48]	0.9952	0.9700	0.8328
Universal Macro-Average (3 Domains)	8,000	24.52%	—	0.9924	0.9634	0.8326

3-Utterance Multi-Enrollment Verification Across Evaluation Domains

Evaluation Split	Trials	3-Utt EER (%)	95% Bootstrap CI (%)	minDCF@0.01	ROC-AUC
LibriSpeech (3-Utt)	1,000	14.60%	[12.40, 17.05]	0.9560	0.9242
CN-Celeb2 (3-Utt)	1,000	30.60%	[27.80, 33.35]	0.9760	0.7659
VoxCeleb1 (3-Utt)	1,000	17.80%	[14.80, 20.50]	0.9920	0.9050
Universal Pooled (3-Utt)	3,000	20.97%	[19.57, 22.57]	0.9907	0.8730
Universal Macro-Average (3-Utt)	3,000	21.00%	—	0.9747	0.8650

Citation

@inproceedings{wan2018generalized,
  title={Generalized End-to-End Loss for Speaker Verification},
  author={Wan, Li and Wang, Quan and Papir, Alan and Moreno, Ignacio Lopez},
  booktitle={IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)},
  pages={4879--4883},
  year={2018}
}

@inproceedings{pelecanos2021dr,
  title={Dr-Vectors: Decision Residual Networks and an Improved Loss for Speaker Recognition},
  author={Pelecanos, Jason and Wang, Quan and Moreno, Ignacio Lopez},
  booktitle={Interspeech},
  pages={4603--4607},
  year={2021}
}

@inproceedings{wang2022attentive,
  title={Attentive Temporal Pooling for Conformer-based Streaming Language Identification in Long-form Speech},
  author={Wang, Quan and Yu, Yang and Pelecanos, Jason and Huang, Yiling and Moreno, Ignacio Lopez},
  booktitle={The Speaker and Language Recognition Workshop (Odyssey)},
  year={2022}
}

@inproceedings{pelecanos2022parameter,
  title={Parameter-Free Attentive Scoring for Speaker Verification},
  author={Pelecanos, Jason and Wang, Quan and Huang, Yiling and Moreno, Ignacio Lopez},
  booktitle={The Speaker and Language Recognition Workshop (Odyssey)},
  year={2022}
}