Published 84 days ago

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  • Person or organization developing model: Maintained by oct4pie.
  • Model language: Persian / Farsi / fa, fa-IR
  • Model date: June 21, 2022
  • Model type: Speech-to-Text
  • Model version: v0.1.0
  • Compatible with 🐸 STT version: v1.3.0
  • License: GNU Lesser General Public License v3.0
  • Citation details: @techreport{persian-stt, author = {Mehdi Hajmollaahmad Naraghi}, title = {Persian STT v0.1.0}, institution = {Coqui}, address = {\url{}} year = {2022}, month = {June}, number = {STT-FA-0.1.0} }
  • persian-tts GitHub Repo
  • Where to send questions or comments about the model: You can leave an issue on STT issues, open a new discussion on STT discussions, or chat with us on Gitter.

Speech-to-Text for the Persian Language on 16kHz, mono-channel audio.

Factors relevant to Speech-to-Text performance include but are not limited to speaker demographics, recording quality, and background noise. Read more about STT performance factors here.

STT models are usually evaluated in terms of their transcription accuracy, deployment Real-Time Factor, and model size on disk.

Using the language model with settings lm_alpha=0.36669178512950323 and lm_beta=0.3457913671678824 (found via

  • Common-Voice clean: WER: 10.81%, CER: 2.506%
  • More about the model at persian-tts repo

Real-Time Factor (RTF) is defined as proccesing-time / length-of-audio. The exact real-time factor of an STT model will depend on the hardware setup, so you may experience a different RTF.

Recorded average RTF on laptop CPU: .65

For STT, you always must deploy an acoustic model, and it is often the case you also will want to deploy an application-specific language model.

Model type Filename Size
Acoustic model (tflite) persian_stt.tflite 45.3M
Acoustic model (pb) persian_stt.pb 181M
Acoustic model (pbmm) persian_stt.pbmm 181M
Language model kenlm-persian.scorer 1.63GB

Confidence scores and multiple paths from the decoding beam can be used to measure model uncertainty and provide multiple, variable transcripts for any processed audio.

This model was trained on the following corpora: Common Voice 9.0 Persian (cleaned and with custom train/dev/test splits). In total approximately ~271 hours of data.

The validation (“dev”) sets were cleaned and generated from Common Voice 9.0 Persian.

Deploying a Speech-to-Text model into any production setting has ethical implications. You should consider these implications before use.

You should assume every machine learning model has demographic bias unless proven otherwise. For STT models, it is often the case that transcription accuracy is better for men than it is for women. If you are using this model in production, you should acknowledge this as a potential issue.

Speech-to-Text may be mis-used to invade the privacy of others by recording and mining information from private conversations. This kind of individual privacy is protected by law in may countries. You should not assume consent to record and analyze private speech.

Machine learning models (like this STT model) perform best on data that is similar to the data on which they were trained. Read about what to expect from an STT model with regard to your data here.

In most applications, it is recommended that you train your own language model to improve transcription accuracy on your speech data.

aimm add 0.1.0
84 days ago
Unpacked Size
1.68 GB
Total Files