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license: apache-2.0
language: en
library_name: onnx
tags:
- onnx
- wav2vec2
- ctc
- forced-alignment
- quantized
- parseh
base_model: jonatasgrosman/wav2vec2-large-xlsr-53-english
base_model_relation: quantized
datasets:
- common_voice
---
# Parseh English forced-alignment network
This CTC network aligns known English caption text to 16 kHz mono audio in Parseh. It is not a general-purpose speech-recognition model. Parseh runs it locally with NumPy and ONNX Runtime, then uses CTC Viterbi alignment for word spans or character spans.
## Provenance and conversion
Derived from [jonatasgrosman/wav2vec2-large-xlsr-53-english](https://huggingface.co/jonatasgrosman/wav2vec2-large-xlsr-53-english) at `569a6236e92bd5f7652a0420bfe9bb94c5664080`, based on `facebook/wav2vec2-large-xlsr-53`. It was converted to ONNX opset 17 and dynamically quantized to int8 (`QUInt8`, per-channel `MatMul` weights); no retraining was performed. Exact source and output hashes are in `meta.json` and `SHA256SUMS`.
## Verification
- ONNX Runtime CPU versions: 1.23.2, 1.30.0; dynamic 0.5 s and 60 s inputs passed.
- fp32 ONNX/PyTorch log-softmax max absolute difference: `7.295608520507812e-05`; frame-argmax agreement: `None`.
- int8/fp32 frame-argmax agreement: `1.0`; generated-speech span-start delta median/p95/max: `0.0` / `0.0` / `0.0` ms.
- Generated 30-second CPU alignment cost: `5.709291` s; peak RSS: `2924044288` bytes.
`espeak-ng` generated audio was used only for pipeline monotonicity, not a real-speech accuracy claim. Unknown characters use a wildcard score to preserve a monotonic path.
## Limitations
Input must be 16 kHz mono audio and known caption text. Noise, accents, text errors, vocabulary gaps, and quantization can affect timestamps. No accuracy guarantee is made.
## Licence and attribution
The source tag is `apache-2.0`. `LICENSE` and `NOTICE` retain source, base-model, dataset attribution, and changes. No endorsement by original authors, Meta, Mozilla, or Parseh is implied.
## Citation from the source card
```bibtex
@misc{grosman2021xlsr53-large-english,
title={Fine-tuned {XLSR}-53 large model for speech recognition in {E}nglish},
author={Grosman, Jonatas},
howpublished={\url{https://huggingface.co/jonatasgrosman/wav2vec2-large-xlsr-53-english}},
year={2021}
}
```
## Contact
Contact: [development@parseh.io](mailto:development@parseh.io).
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