ASR Fine-Tunes

Speech recognition models I have fine-tuned for my own dictation. Each line has a code name, so they are easy to tell apart. This page says what each one is for and how they differ.

At a Glance

Code names come from foods. The code-switching line is named after Israeli foods, the no-Hebrew line after Irish foods. Later retrains keep the name and bump the version.

Model Use it for Hebrew words Streaming Base
Jachnun v1.0 English–Hebrew code-switching Yes, romanized No nvidia/parakeet-tdt-0.6b-v2
Sabich v1.0 Code-switching plus tech vocabulary Yes, romanized No nvidia/parakeet-tdt-0.6b-v2
Boxty v1.0 English dictation, no Hebrew No No nvidia/parakeet-tdt-0.6b-v2
Nemotron Streaming (code-switching) Streaming variant of the code-switching model Yes, romanized Yes nvidia/nemotron-speech-streaming-en-0.6b
Whisper Hebrish Small ACFT Code-switching for FUTO Keyboard on Android Yes, romanized No openai/whisper-small.en

More voices next

So far these are trained on one voice, mine. Recordings from more speakers are the next step for Hebrish: contribute yours.

Access by request

The model repos are gated. Access is by request under the Hebrish terms. Non-commercial use is free.

Open training data

The recordings and transcripts are published in the training-data collection on Hugging Face.

The Models

Released Israeli foods line

Jachnun v1.0

English–Hebrew code-switching

English dictation with Hebrew words dropped in. The Hebrew words come out in romanized Latin letters: makolet, teudat zehut, arnona.

  • For English speakers in Israel who mix everyday Hebrew into their English.
  • Output is always English text. It never writes Hebrew script.
  • About 70% code-switched speech and 30% plain English in training, so plain English does not get worse.
  • Earlier proof-of-concept checkpoints were PoC-1 to PoC-5. Jachnun v1.0 is the first named release.
5.42% Code-switched speech stock v2 11.82%
46.9% Unseen Hebrew terms spelled right stock v2 23.8%
1.20% LibriSpeech stock v2 1.23%

Normalised WER on the shared test set, lower is better. Term recall: higher is better.

Base
nvidia/parakeet-tdt-0.6b-v2
Released
2026-10-19
Training run
r6-en30
Apps
Hebrish (Android keyboard and desktop apps), Parlance (Android, Linux and Windows)
Released Israeli foods line

Sabich v1.0

Code-switching plus tech vocabulary

The second code-switching model, next to Jachnun. It is trained on Jachnun’s data plus everything else: tech vocabulary, brand names, acronyms, numbers and currency, Irish-English phrasing, disfluencies and self-corrections.

  • Named after the Israeli pita with a bit of everything in it.
  • Retrained from stock Parakeet, not on top of Jachnun. Every version starts from the same base with the cumulative data.
  • 560.5 minutes of my own recordings (373.1 of them code-switching) plus 62.5 minutes of replay. 20 epochs on one Modal L40S, 52 minutes.
  • Level with Jachnun on code-switching, a modest gain on tech vocabulary. The extra data did not cost code-switching accuracy, so both models ship in the Hebrish apps.
5.30% Code-switched speech Jachnun 5.42%, stock v2 11.82%
48.1% Unseen Hebrew terms spelled right Jachnun 46.9%, stock v2 23.8%
1.54% Tech dictation Jachnun 1.74%, stock v2 2.51%
1.30% LibriSpeech Jachnun 1.20%, stock v2 1.23%

Normalised WER on the held-out split, lower is better. Term recall: higher is better. On the public benchmark (84 clips) Sabich and Jachnun are within noise: term recall 73.8% vs 73.3%, WER 3.27% vs 3.32%.

Base
nvidia/parakeet-tdt-0.6b-v2
Released
2026-10-20
Training run
r7-all
Apps
Hebrish (Android keyboard and desktop apps)
Released Irish foods line

Boxty v1.0

English dictation, no Hebrew

Everyday English dictation without Hebrew: tech vocabulary, brand names, acronyms, numbers and currency in digits, homophones, Irish-English phrasing, and email and message dictation.

  • The no-Hebrew sibling of Jachnun. No code-switched, Hebrew-name or religious-term recording went into it.
  • Named after Irish foods because the speaker is Irish. Boxty is the Irish potato pancake.
  • Best of the set on Hebrew-free English and tech dictation, with no loss on general English.
  • On code-switched speech it stays at stock level (11.5%) by design. Use Jachnun for mixed English and Hebrew.
1.04% Hebrew-free English stock v2 1.79%, Jachnun 1.23%
1.35% Tech dictation stock v2 2.51%, Jachnun 1.74%
1.18% LibriSpeech stock v2 1.23%

Normalised WER on the shared test set, lower is better.

Base
nvidia/parakeet-tdt-0.6b-v2
Released
2026-10-20
Training run
r7-general
Apps
Parlance (Android, Linux and Windows)
Experimental

Nemotron Streaming (code-switching)

Streaming variant of the code-switching model

The same code-switching task as Jachnun, on NVIDIA’s Nemotron streaming base. Text appears while you speak, in chunks of 80 to 1,120 ms.

  • Trained on the same data with the same recipe as Jachnun v1.0, as a side-by-side comparison.
  • Slightly less accurate than Jachnun. Use it when you need live, streaming text.
  • Streaming costs no measurable accuracy against offline decoding.
5.65% Code-switched speech, streaming 560 ms offline 5.81%
5.8% Code-switched speech, offline Jachnun 5.1%

Normalised WER on the held-out code-switching split, lower is better.

Base
nvidia/nemotron-speech-streaming-en-0.6b
Released
2026-10-19
Training run
r6-nemotron-en30
Released

Whisper Hebrish Small ACFT

Code-switching for FUTO Keyboard on Android

A phone-sized Whisper fine-tune for English speech with Hebrew words, built to run inside FUTO Keyboard and FUTO Voice Input on Android.

  • A single 264 MB whisper.cpp file (Q8_0), the same format as FUTO’s own English model. Import it in FUTO Keyboard settings.
  • FUTO’s ACFT procedure was applied after the fine-tune, so it works with FUTO’s short-clip speed-up instead of repeating itself.
  • English-only base, so it cannot drift into Hebrew script.
  • The phone-sized version of the earlier Whisper Hebrish (Large v3 Turbo) model.
5.8% Code-switched speech, on the phone FUTO stock 11.8%
50% Unseen Hebrew terms spelled right FUTO stock 26%
2.8% Own plain English FUTO stock 4.1%

Normalised WER in the FUTO runtime, lower is better. Term recall: higher is better.

Base
openai/whisper-small.en
Apps
FUTO Keyboard (Android)

Need a speech model tuned to your vocabulary?

The same approach works for other speakers, accents and domains. Get in touch if you want to talk it through.