---
license: apache-2.0
language: hi
library_name: onnx
tags:
- onnx
- wav2vec2
- ctc
- forced-alignment
- quantized
- parseh
base_model: ai4bharat/indicwav2vec-hindi
base_model_relation: quantized
---

# Parseh Hindi forced-alignment network

This CTC network aligns known Hindi 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 [ai4bharat/indicwav2vec-hindi](https://huggingface.co/ai4bharat/indicwav2vec-hindi) at `e746fa3e8de3f6629b9ded29d9c1c565c566f3db`, based on `AI4Bharat IndicWav2Vec (exact upstream base revision not stated in public Hub metadata)`. 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: `6.67572021484375e-05`; frame-argmax agreement: `1.0`.
- 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: `4.991424` s; peak RSS: `2877698048` 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

No separate citation block was provided by the source card.

## Contact

Contact: [development@parseh.io](mailto:development@parseh.io).