🌿 Build AI-powered real-time audio applications in a breeze 🌿

Diart is a python framework to build AI-powered real-time audio applications. Its key feature is the ability to recognize different speakers in real time with state-of-the-art performance, a task commonly known as "speaker diarization".

The pipeline diart.SpeakerDiarization combines a speaker segmentation and a speaker embedding model to power an incremental clustering algorithm that gets more accurate as the conversation progresses:

With diart you can also create your own custom AI pipeline, benchmark it, tune its hyper-parameters, and even serve it on the web using websockets.

We provide pre-trained pipelines for:

• Speaker Diarization
• Voice Activity Detection
• Transcription (coming soon)
• Speaker-Aware Transcription (coming soon)

1) Make sure your system has the following dependencies:

ffmpeg < 4.4
portaudio == 19.6.X
libsndfile >= 1.2.2

Alternatively, we provide an environment.yml file for a pre-configured conda environment:

conda env create -f diart/environment.yml
conda activate diart

2) Install the package:

pip install diart

By default, diart is based on pyannote.audio models from the huggingface hub. In order to use them, please follow these steps:

1. Accept user conditions for the pyannote/segmentation model
2. Accept user conditions for the newest pyannote/segmentation-3.0 model
3. Accept user conditions for the pyannote/embedding model
4. Install huggingface-cli and log in with your user access token (or provide it manually in diart CLI or API).

A recorded conversation:

diart.stream /path/to/audio.wav

A live conversation:

# Use "microphone:ID" to select a non-default device
# See `python -m sounddevice` for available devices
diart.stream microphone

By default, diart runs a speaker diarization pipeline, equivalent to setting --pipeline SpeakerDiarization, but you can also set it to --pipeline VoiceActivityDetection. See diart.stream -h for more options.

Use StreamingInference to run a pipeline on an audio source and write the results to disk:

from diart import SpeakerDiarization
from diart.sources import MicrophoneAudioSource
from diart.inference import StreamingInference
from diart.sinks import RTTMWriter

pipeline = SpeakerDiarization()
mic = MicrophoneAudioSource()
inference = StreamingInference(pipeline, mic, do_plot=True)
inference.attach_observers(RTTMWriter(mic.uri, "/output/file.rttm"))
prediction = inference()

For inference and evaluation on a dataset we recommend to use Benchmark (see notes on reproducibility).

You can use other models with the --segmentation and --embedding arguments. Or in python:

import diart.models as m

segmentation = m.SegmentationModel.from_pretrained("model_name")
embedding = m.EmbeddingModel.from_pretrained("model_name")

Below is a list of all the models currently supported by diart:

The latency of segmentation models is measured in a VAD pipeline (5s chunks).

The latency of embedding models is measured in a diarization pipeline using pyannote/segmentation (also 5s chunks).

* CPU: AMD Ryzen 9 - GPU: RTX 4060 Max-Q

Third-party models can be integrated by providing a loader function:

from diart import SpeakerDiarization, SpeakerDiarizationConfig
from diart.models import EmbeddingModel, SegmentationModel

def segmentation_loader():
    # It should take a waveform and return a segmentation tensor
    return load_pretrained_model("my_model.ckpt")

def embedding_loader():
    # It should take (waveform, weights) and return per-speaker embeddings
    return load_pretrained_model("my_other_model.ckpt")

segmentation = SegmentationModel(segmentation_loader)
embedding = EmbeddingModel(embedding_loader)
config = SpeakerDiarizationConfig(
    segmentation=segmentation,
    embedding=embedding,
)
pipeline = SpeakerDiarization(config)

If you have an ONNX model, you can use from_onnx():

from diart.models import EmbeddingModel

embedding = EmbeddingModel.from_onnx(
    model_path="my_model.ckpt",
    input_names=["x", "w"],  # defaults to ["waveform", "weights"]
    output_name="output",  # defaults to "embedding"
)

Diart implements an optimizer based on optuna that allows you to tune pipeline hyper-parameters to your needs.

diart.tune /wav/dir --reference /rttm/dir --output /output/dir

See diart.tune -h for more options.

from diart.optim import Optimizer

optimizer = Optimizer("/wav/dir", "/rttm/dir", "/output/dir")
optimizer(num_iter=100)

This will write results to an sqlite database in /output/dir.

For bigger datasets, it is sometimes more convenient to run multiple optimization processes in parallel. To do this, create a study on a recommended DBMS (e.g. MySQL or PostgreSQL) making sure that the study and database names match:

mysql -u root -e "CREATE DATABASE IF NOT EXISTS example"
optuna create-study --study-name "example" --storage "mysql://root@localhost/example"

You can now run multiple identical optimizers pointing to this database:

diart.tune /wav/dir --reference /rttm/dir --storage mysql://root@localhost/example

or in python:

from diart.optim import Optimizer
from optuna.samplers import TPESampler
import optuna

db = "mysql://root@localhost/example"
study = optuna.load_study("example", db, TPESampler())
optimizer = Optimizer("/wav/dir", "/rttm/dir", study)
optimizer(num_iter=100)

For a more advanced usage, diart also provides building blocks that can be combined to create your own pipeline. Streaming is powered by RxPY, but the blocks module is completely independent and can be used separately.

Obtain overlap-aware speaker embeddings from a microphone stream:

import rx.operators as ops
import diart.operators as dops
from diart.sources import MicrophoneAudioSource
from diart.blocks import SpeakerSegmentation, OverlapAwareSpeakerEmbedding

segmentation = SpeakerSegmentation.from_pretrained("pyannote/segmentation")
embedding = OverlapAwareSpeakerEmbedding.from_pretrained("pyannote/embedding")
mic = MicrophoneAudioSource()

stream = mic.stream.pipe(
    # Reformat stream to 5s duration and 500ms shift
    dops.rearrange_audio_stream(sample_rate=segmentation.model.sample_rate),
    ops.map(lambda wav: (wav, segmentation(wav))),
    ops.starmap(embedding)
).subscribe(on_next=lambda emb: print(emb.shape))

mic.read()

Output:

# Shape is (batch_size, num_speakers, embedding_dim)
torch.Size([1, 3, 512])
torch.Size([1, 3, 512])
torch.Size([1, 3, 512])
...

Diart is also compatible with the WebSocket protocol to serve pipelines on the web.

diart.serve --host 0.0.0.0 --port 7007
diart.client microphone --host <server-address> --port 7007

Note: make sure that the client uses the same step and sample_rate than the server with --step and -sr.

See -h for more options.

For customized solutions, a server can also be created in python using the WebSocketAudioSource:

from diart import SpeakerDiarization
from diart.sources import WebSocketAudioSource
from diart.inference import StreamingInference

pipeline = SpeakerDiarization()
source = WebSocketAudioSource(pipeline.config.sample_rate, "localhost", 7007)
inference = StreamingInference(pipeline, source)
inference.attach_hooks(lambda ann_wav: source.send(ann_wav[0].to_rttm()))
prediction = inference()

Diart is the official implementation of the paper Overlap-aware low-latency online speaker diarization based on end-to-end local segmentation by Juan Manuel Coria, Hervé Bredin, Sahar Ghannay and Sophie Rosset.

We propose to address online speaker diarization as a combination of incremental clustering and local diarization applied to a rolling buffer updated every 500ms. Every single step of the proposed pipeline is designed to take full advantage of the strong ability of a recently proposed end-to-end overlap-aware segmentation to detect and separate overlapping speakers. In particular, we propose a modified version of the statistics pooling layer (initially introduced in the x-vector architecture) to give less weight to frames where the segmentation model predicts simultaneous speakers. Furthermore, we derive cannot-link constraints from the initial segmentation step to prevent two local speakers from being wrongfully merged during the incremental clustering step. Finally, we show how the latency of the proposed approach can be adjusted between 500ms and 5s to match the requirements of a particular use case, and we provide a systematic analysis of the influence of latency on the overall performance (on AMI, DIHARD and VoxConverse).

If you found diart useful, please make sure to cite our paper:

@inproceedings{diart,  
  author={Coria, Juan M. and Bredin, Hervé and Ghannay, Sahar and Rosset, Sophie},  
  booktitle={2021 IEEE Automatic Speech Recognition and Understanding Workshop (ASRU)},   
  title={Overlap-Aware Low-Latency Online Speaker Diarization Based on End-to-End Local Segmentation}, 
  year={2021},
  pages={1139-1146},
  doi={10.1109/ASRU51503.2021.9688044},
}

Important: We highly recommend installing pyannote.audio<3.1 to reproduce these results. For more information, see this issue.

Diart aims to be lightweight and capable of real-time streaming in practical scenarios. Its performance is very close to what is reported in the paper (and sometimes even a bit better).

To obtain the best results, make sure to use the following hyper-parameters:

diart.benchmark and diart.inference.Benchmark can run, evaluate and measure the real-time latency of the pipeline. For instance, for a DIHARD III configuration:

diart.benchmark /wav/dir --reference /rttm/dir --tau-active=0.555 --rho-update=0.422 --delta-new=1.517 --segmentation pyannote/segmentation@Interspeech2021

or using the inference API:

from diart.inference import Benchmark, Parallelize
from diart import SpeakerDiarization, SpeakerDiarizationConfig
from diart.models import SegmentationModel

benchmark = Benchmark("/wav/dir", "/rttm/dir")

model_name = "pyannote/segmentation@Interspeech2021"
model = SegmentationModel.from_pretrained(model_name)
config = SpeakerDiarizationConfig(
    # Set the segmentation model used in the paper
    segmentation=model,
    step=0.5,
    latency=0.5,
    tau_active=0.555,
    rho_update=0.422,
    delta_new=1.517
)
benchmark(SpeakerDiarization, config)

# Run the same benchmark in parallel
p_benchmark = Parallelize(benchmark, num_workers=4)
if __name__ == "__main__":  # Needed for multiprocessing
    p_benchmark(SpeakerDiarization, config)

This pre-calculates model outputs in batches, so it runs a lot faster. See diart.benchmark -h for more options.

For convenience and to facilitate future comparisons, we also provide the expected outputs of the paper implementation in RTTM format for every entry of Table 1 and Figure 5. This includes the VBx offline topline as well as our proposed online approach with latencies 500ms, 1s, 2s, 3s, 4s, and 5s.

MIT License

Copyright (c) 2021 Université Paris-Saclay
Copyright (c) 2021 CNRS

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