| --- |
| license: cc-by-4.0 |
| library_name: onnxruntime |
| pipeline_tag: automatic-speech-recognition |
| tags: |
| - parakeet |
| - tdt |
| - onnx |
| - webgpu |
| language: |
| - bg |
| - hr |
| - cs |
| - da |
| - nl |
| - en |
| - et |
| - fi |
| - fr |
| - de |
| - el |
| - hu |
| - it |
| - lv |
| - lt |
| - mt |
| - pl |
| - pt |
| - ro |
| - ru |
| - sk |
| - sl |
| - es |
| - sv |
| - uk |
| base_model: |
| - moondream/parakeet-ultra |
| - moondream/parakeet-redux |
| --- |
| |
| # Discourse STT models |
|
|
| Speech-to-text models for live captions and transcripts in [Discourse](https://www.discourse.org)'s voice plugin. They run entirely in the browser, with [onnxruntime-web](https://onnxruntime.ai) on WebGPU. The worker that loads them ships in the [`discourse_voice_assets`](https://github.com/discourse/discourse_voice_assets) gem. |
|
|
| Each folder holds one model in the same layout. The voice plugin points the worker at a folder's URL. |
|
|
| | Folder | Model | Encoder | Download | |
| |---|---|---|---| |
| | `ultra-q4/` | Parakeet Ultra | 4-bit MatMulNBits (block 32) | ~393 MB | |
| | `redux-w2a8/` | Parakeet Redux | 2-bit MatMulNBits (block 128), lossless for its ternary weights | ~199 MB | |
|
|
| Every folder contains: |
|
|
| - `encoder-model.onnx`: a FastConformer encoder in a single file with no external data. The input is 128-bin log-mel features at 16 kHz. |
| - `decoder_joint-model.int8.onnx`: the TDT prediction and joint network, dynamically quantized to int8. |
| - `vocab.txt`: an 8193-token SentencePiece vocabulary with blank id 8192. It is identical for both models. |
|
|
| Both models are post-trained versions of NVIDIA's [parakeet-tdt-0.6b-v3](https://huggingface.co/nvidia/parakeet-tdt-0.6b-v3). They keep its architecture, tokenizer and 25 European languages. |
|
|
| - **Ultra** is the default. |
| - **Redux** is a much smaller download, with worse accuracy in several languages (including French and German) and in noisy audio. |
|
|
| See Moondream's model cards for benchmarks. |
|
|
| ## Modifications |
|
|
| The joint network's output bias for `<unk>` (token 0) is set to -1e4 in both decoders. Neither model can emit `<unk>`, which they otherwise produce for symbols missing from the vocabulary, such as `°` and `+`. Both decoders come from Olicorne's exports, which already carry this patch. The other files are byte-identical to their sources. |
|
|
| ## Provenance |
|
|
| | File | Source repository | Revision | Original path | |
| |---|---|---|---| |
| | `ultra-q4/encoder-model.onnx` | [mrfakename/parakeet-ultra-ONNX](https://huggingface.co/mrfakename/parakeet-ultra-ONNX) | `590d2668ea7c80d7e487da67a2946a20cb50780f` | `encoder-model.q4.onnx` | |
| | `ultra-q4/decoder_joint-model.int8.onnx` | [Olicorne/parakeet-tdt-0.6b-v3-ultra-onnx](https://huggingface.co/Olicorne/parakeet-tdt-0.6b-v3-ultra-onnx) | `a1fe742758beb8ddc918bff00e1e319fe7e4d3e3` | `int8/decoder_joint-model.int8.onnx` | |
| | `ultra-q4/vocab.txt` | mrfakename/parakeet-ultra-ONNX | `590d2668ea7c80d7e487da67a2946a20cb50780f` | `vocab.txt` | |
| | `redux-w2a8/encoder-model.onnx` | [Olicorne/parakeet-tdt-0.6b-v3-redux-onnx](https://huggingface.co/Olicorne/parakeet-tdt-0.6b-v3-redux-onnx) | `7f2cf7ee13423501f912bf32e4624570d6cb6fcd` | `w2a8/encoder-model.w2a8.onnx` | |
| | `redux-w2a8/decoder_joint-model.int8.onnx` | Olicorne/parakeet-tdt-0.6b-v3-redux-onnx | `7f2cf7ee13423501f912bf32e4624570d6cb6fcd` | `int8/decoder_joint-model.int8.onnx` | |
| | `redux-w2a8/vocab.txt` | Olicorne/parakeet-tdt-0.6b-v3-redux-onnx | `7f2cf7ee13423501f912bf32e4624570d6cb6fcd` | `vocab.txt` | |
|
|
| SHA-256: |
|
|
| ``` |
| 40265cd6754f44f3deed117fa551eed69b974233b1c28c9b5a46750d0e27f648 ultra-q4/encoder-model.onnx |
| 667ffde2242a560923cba6bc7f69ef03d736f8a36ca9588f2e6f9fa818cf2fc1 ultra-q4/decoder_joint-model.int8.onnx |
| d58544679ea4bc6ac563d1f545eb7d474bd6cfa467f0a6e2c1dc1c7d37e3c35d ultra-q4/vocab.txt |
| 24abd7ae5e82a3328de6c780ea21010460d14bc1c8a17e5c9c3bc031c381a712 redux-w2a8/encoder-model.onnx |
| c729ceaebd43ef6581890079505d04ab5b40c0b7a87ca1f78ad6054c1eae3144 redux-w2a8/decoder_joint-model.int8.onnx |
| d58544679ea4bc6ac563d1f545eb7d474bd6cfa467f0a6e2c1dc1c7d37e3c35d redux-w2a8/vocab.txt |
| ``` |
|
|
| ## Self-hosting |
|
|
| Copy the folders to any HTTPS host that serves them with CORS enabled. Then set the voice plugin's `voice_stt_model_base_url` to the URL of the directory that contains them. Keep the layout and file names unchanged. |
|
|
| Browsers cache model files by URL. If you replace a file, publish it under a new URL instead of overwriting it in place. |
|
|
| ## License and attribution |
|
|
| Released under [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/), like the models they derive from: |
|
|
| - [nvidia/parakeet-tdt-0.6b-v3](https://huggingface.co/nvidia/parakeet-tdt-0.6b-v3), © NVIDIA |
| - [moondream/parakeet-ultra](https://huggingface.co/moondream/parakeet-ultra) and [moondream/parakeet-redux](https://huggingface.co/moondream/parakeet-redux), © M87 Labs (Moondream) |
| - ONNX exports by [mrfakename](https://huggingface.co/mrfakename) and [Olicorne](https://huggingface.co/Olicorne), and through them [eschmidbauer/parakeet-redux-onnx](https://huggingface.co/eschmidbauer/parakeet-redux-onnx) |
|
|
