Whisper model files in custom `ggml` format

The original Whisper PyTorch models provided by OpenAI are converted to custom ggml format in order to be able to load them in C/C++. Conversion is performed using the convert-pt-to-ggml.py script.

There are three ways to obtain ggml models:

1. Use download-ggml-model.sh to download pre-converted models

Example download:

$ ./download-ggml-model.sh base.en
Downloading ggml model base.en ...
models/ggml-base.en.bin          100%[=============================================>] 141.11M  5.41MB/s    in 22s
Done! Model 'base.en' saved in 'models/ggml-base.en.bin'
You can now use it like this:

  $ ./build/bin/whisper-cli -m models/ggml-base.en.bin -f samples/jfk.wav

2. Manually download pre-converted models

ggml models are available from the following locations:

https://huggingface.co/ggerganov/whisper.cpp/tree/main

3. Convert with convert-pt-to-ggml.py

Download one of the models provided by OpenAI and generate the ggml files using the convert-pt-to-ggml.py script.

Example conversion, assuming the original PyTorch files have been downloaded into ~/.cache/whisper. Change ~/path/to/repo/whisper/ to the location for your copy of the Whisper source:

mkdir models/whisper-medium
python models/convert-pt-to-ggml.py ~/.cache/whisper/medium.pt ~/path/to/repo/whisper/ ./models/whisper-medium
mv ./models/whisper-medium/ggml-model.bin models/ggml-medium.bin
rmdir models/whisper-medium

Available models

Model	Disk	SHA
tiny	75 MiB	`bd577a113a864445d4c299885e0cb97d4ba92b5f`
tiny.en	75 MiB	`c78c86eb1a8faa21b369bcd33207cc90d64ae9df`
base	142 MiB	`465707469ff3a37a2b9b8d8f89f2f99de7299dac`
base.en	142 MiB	`137c40403d78fd54d454da0f9bd998f78703390c`
small	466 MiB	`55356645c2b361a969dfd0ef2c5a50d530afd8d5`
small.en	466 MiB	`db8a495a91d927739e50b3fc1cc4c6b8f6c2d022`
small.en-tdrz	465 MiB	`b6c6e7e89af1a35c08e6de56b66ca6a02a2fdfa1`
medium	1.5 GiB	`fd9727b6e1217c2f614f9b698455c4ffd82463b4`
medium.en	1.5 GiB	`8c30f0e44ce9560643ebd10bbe50cd20eafd3723`
large-v1	2.9 GiB	`b1caaf735c4cc1429223d5a74f0f4d0b9b59a299`
large-v2	2.9 GiB	`0f4c8e34f21cf1a914c59d8b3ce882345ad349d6`
large-v2-q5_0	1.1 GiB	`00e39f2196344e901b3a2bd5814807a769bd1630`
large-v3	2.9 GiB	`ad82bf6a9043ceed055076d0fd39f5f186ff8062`
large-v3-q5_0	1.1 GiB	`e6e2ed78495d403bef4b7cff42ef4aaadcfea8de`
large-v3-turbo	1.5 GiB	`4af2b29d7ec73d781377bfd1758ca957a807e941`
large-v3-turbo-q5_0	547 MiB	`e050f7970618a659205450ad97eb95a18d69c9ee`

Models are multilingual unless the model name includes .en. Models ending in -q5_0 are quantized. Models ending in -tdrz support local diarization (marking of speaker turns) using tinydiarize. More information about models is available upstream (openai/whisper). The list above is a subset of the models supported by the download-ggml-model.sh script, but many more are available at https://huggingface.co/ggerganov/whisper.cpp/tree/main and elsewhere.

Model files for testing purposes

The model files prefixed with for-tests- are empty (i.e. do not contain any weights) and are used by the CI for testing purposes. They are directly included in this repository for convenience and the Github Actions CI uses them to run various sanitizer tests.

Fine-tuned models

There are community efforts for creating fine-tuned Whisper models using extra training data. For example, this blog post describes a method for fine-tuning using Hugging Face (HF) Transformer implementation of Whisper. The produced models are in slightly different format compared to the original OpenAI format. To read the HF models you can use the convert-h5-to-ggml.py script like this:

git clone https://github.com/openai/whisper
git clone https://github.com/ggml-org/whisper.cpp

# clone HF fine-tuned model (this is just an example)
git clone https://huggingface.co/openai/whisper-medium

# convert the model to ggml
python3 ./whisper.cpp/models/convert-h5-to-ggml.py ./whisper-medium/ ./whisper .

Distilled models

Initial support for https://huggingface.co/distil-whisper is available.

Currently, the chunk-based transcription strategy is not implemented, so there can be sub-optimal quality when using the distilled models with whisper.cpp.

# clone OpenAI whisper and whisper.cpp
git clone https://github.com/openai/whisper
git clone https://github.com/ggml-org/whisper.cpp

# get the models
cd whisper.cpp/models
git clone https://huggingface.co/distil-whisper/distil-medium.en
git clone https://huggingface.co/distil-whisper/distil-large-v2

# convert to ggml
python3 ./convert-h5-to-ggml.py ./distil-medium.en/ ../../whisper .
mv ggml-model.bin ggml-medium.en-distil.bin

python3 ./convert-h5-to-ggml.py ./distil-large-v2/ ../../whisper .
mv ggml-model.bin ggml-large-v2-distil.bin

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