speech2text

NOTE: The user guide for the Open On Demand web interface can be found here.

This repo contains instructions for setting up and applying the speech2text app on Aalto Triton cluster. The app utilizes

• WhisperX automatic speech recognition tool
• wav2vec to find word start and end timestamps for WhisperX transcription
• Pyannote speaker detection (diarization) tool

The speech recognition and diarization steps are run independently and their result segments are combined using a simple algorithm which for each transcription word segment finds the most overlapping (in time) speaker segment.

The required models are described here.

Conda environment and Lmod setup is described here.

Command line (technical) usage on Triton is described here.

Open On Demand web interface (non-technical) usage is described here.

Supported languages are:

arabic (ar), armenian (hy), bulgarian (bg), catalan (ca), chinese (zh), czech (cs), danish (da), dutch (nl), english (en), estonian (et), finnish (fi), french (fr), galician (gl), german (de), greek (el), hebrew (he), hindi (hi), hungarian (hu), icelandic (is), indonesian (id), italian (it), japanese (ja), kazakh (kk), korean (ko), latvian (lv), lithuanian (lt), malay (ms), marathi (mr), nepali (ne), norwegian (no), persian (fa), polish (pl), portuguese (pt), romanian (ro), russian (ru), serbian (sr), slovak (sk), slovenian (sl), spanish (es), swedish (sv), thai (th), turkish (tr), ukrainian (uk), urdu (ur), vietnamese (vi)

Deploy on Aalto Triton

Create a base folder for the app if haven't been created

mkdir /appl/manual_installations/software/speech2text

Clone git repo and change directory

cd /appl/manual_installations/software/speech2text
git clone https://github.com/AaltoRSE/speech2text.git YYYY-N
cd YYYY-N

where YYYY is current year and N the running version number for the year.

Create a conda environment to env/

module load mamba
mamba env create --file env.yml --prefix env/

To deploy both command line interface (CLI) module and the Open On Demand (OOD) app, run

bin/deploy cli ood

or only the other if only one needs updating.

Check the contents of the script for details.

Usage

OnDemand

The user guide for the Open On Demand web interface can be found here.

Command line

After the conda environment and Lmod have been setup and activated, speech2text is used in three steps:

Load the speech2text app with

module load speech2text

Set email (for Slurm job notifications) and audio language environment variables with

export SPEECH2TEXT_EMAIL=my.name@aalto.fi
export SPEECH2TEXT_LANGUAGE=mylanguage

For example:

export SPEECH2TEXT_EMAIL=john.smith@aalto.fi
export SPEECH2TEXT_LANGUAGE=finnish

Notification emails will be sent to given email address. If the addresss is left unspecified, no notifications are sent.

Finally, process a single audio file with

speech2text test-data/en/test1.mp3

Alternatively, process multiple audio files in a folder

speech2text audio-files/

Using the latter option submits the files as an array job. See src/submit.py for details about the submissions.

The audio file(s) can be in any common audio (.wav, .mp3, .aff, etc.) or video (.mp4, .mov, etc.) format.

The transcription and diarization results (.txt and .csv files) corresponding to each audio file will be written to results/ next to the file. See below for details.

NOTE: While speech2text by default uses the large-v3 model, user can specify the model with the SPEECH2TEXT_WHISPER_MODEL environment variable. Note, however, that only large-v2 and large-v3 models have been pre-downloaded.

Output formats

The output formats are .csv and .txt. For example, output files corresponding to input audio files

test1.mp3
test2.mp3

are

test1.csv
test1.txt
test2.csv
test2.txt

Example of .csv output format (computer-friendly format):

start,end,speaker,transcription
00:00:00,00:00:05,SPEAKER_00,"This is the first sentence of the first speaker."
00:00:06,00:00:10,SPEAKER_00,"This is the second sentence of the first speaker."
00:00:11,00:00:15,SPEAKER_01,"This is a sentence from the second speaker."

Corresponding example of .txt output format (human-friendly format):

(00:00:00 - 00:00:10) SPEAKER_00

This is the first sentence of the first speaker. This is the second sentence of the first speaker.

(00:00:11 - 00:00:15) SPEAKER_01

This is a sentence from the second speaker.

Models

The required models have been downloaded beforehand from Hugging Face and saved into a shared data folder on the cluster. Therefore, users do not have to download the models themselves. Make sure the following models have been downloaded and accessible.

Faster Whisper

We support large-v2 and large-v3 (default) multilingual Faster Whisper models. Languages supported by the models are:

The models are covered by the MIT licence and have been pre-downloaded from Hugging Face to

/scratch/shareddata/dldata/huggingface-hub-cache/hub/models--Systran--faster-whisper-large-v2

and

/scratch/shareddata/dldata/huggingface-hub-cache/hub/models--Systran--faster-whisper-large-v3

wav2vec

We use wav2vec models as part of the diarization pipeline which efines the timestamps from whisper transcriptions using forced alignment a phoneme-based ASR model (wav2vec 2.0). This provides word-level timestamps, as well as improved segment timestamps.

We use a fine-tuned wav2vec model for each of the supported languages. All the models are fine-tuned over the Meta's XLRS model.

Pyannote

The diarization is performed using the pyannote/speaker-diarization-3.1 pipeline installed via pyannote.audio.

NOTE: pyannote.audio is covered by MIT licence but the diarization pipeline is gated. In order to use it, log in to Hugging Face and accept the conditions to access it.

The pyannote/segmentation-3.0 model used by the pipeline has been pre-downloaded from Hugging Face to

/scratch/shareddata/speech2text/pyannote/segmentation-3.0/blob/main/pytorch_model.bin

This path has been hard-coded to the Pyannote config file located in pyannote/config.yml.

NOTE: pyannote/segmentation-3.0 is also covered by MIT licence but is gated separately. In order to use it, log in to pyannote/segmentation-3.0 and accept the conditions to access it.

Due to gating, the model has not been saved to /scratch/shareddata/dldata/huggingface-hub-cache/ which is meant for models accessible more generally to Triton users.

Wrapper around the wespeaker-voxceleb-resnet34-LM pretrained speaker embedding model is used by pyannote-audio version 3.1 and higher (see pyannote/config.yml). The model is covered by the MIT licence and has been pre-downloaded from Hugging Face to

/scratch/shareddata/dldata/huggingface-hub-cache/hub/models--pyannote--wespeaker-voxceleb-resnet34-LM.

Data

Repository contains three example audio files for testing purposes

test-data/en/test1.mp3
test-data/en/test2.mp3
test-data/fi/test1.mp3

Tests and linting

Create development environment

mamba create --file env_dev.yml --prefix env-dev/
mamba activate env-dev/

Run unit tests in src/

pytest src

Lint code in src/

black src && isort src

Build and run with Singularity

IMPORTANT: This is out of date!

Although currently not needed, the repo also contains a Singularity definition file speech2text.def in project root.

Build Singularity image

Clone git repo and change directory

git clone https://github.com/AaltoRSE/speech2text.git
cd speech2text

Build a singularity image file (.sif) with

srun --mem=8G --cpus-per-task 2 --time 1:00:00 singularity build speech2text.sif speech2text.def

Run in Singularity container

Example run:

srun cpu --mem=10G --cpus-per-task 8 --time 12:00:00 singularity run --nv --bind /scratch:/scratch speech2text.sif test-data/

Build documentation locally

To build documentation locally using Sphinx, run

python3 -m pip install -r docs/sphinx_requirements.txt
sphinx-build docs/source docs/build

The documentation can be found in docs/build/. A good place to start is the index page docs/build/index.html.

Known Issues

Audio files with more than one language

If a single audio file contains speech in more than one language, result files will (probably) still be produced but the results will (probably) be nonsensical to some extent. This is because WhisperX appears to translate languages to the specified target language (mandatory argument SPEECH2TEXT_LANGUAGE). Related discussion: openai/whisper#49.

In some cases, this problem can avoided relatively easily. For example, if the language changes only once in the middle of the audio, you can just split the file into two and process the parts separately. You can use any audio processing software to do this, e.g. Audacity.

Licensing

Source Code

The source code in this repository is covered by the MIT license.

Audio Files

The example audio files test-data/en/test1.mp3, test-data/en/test2.mp3, and test-data/fi/test1.mp3 in this repository, which are recordings of the repository owner's voice, are covered by the CC-BY-NC-ND license.