speakerbox 0.1.0

Speaker Annotation for Transcripts using Audio Classification

speakerbox

Workflow for Annotation and Speaker Classification Model Training from Audio

---

Installation

Stable Release: pip install speakerbox
Development Head: pip install git+https://github.com/CouncilDataProject/speakerbox.git

Documentation

For full package documentation please visit councildataproject.github.io/speakerbox.

Problem

Given a set of recordings of multi-speaker conversations or meetings:

example/
├── 0.wav
├── 1.wav
├── 2.wav
├── 3.wav
├── 4.wav
└── 5.wav

Where each conversation has some or all of a consistent set of speakers, for example:

• 0.wav -- contains speakers: A, B, C, D, E
• 1.wav -- contains speakers: B, D, E
• 2.wav -- contains speakers: A, B, C
• 3.wav -- contains speakers: A, B, C, D, E
• 4.wav -- contains speakers: A, C, D
• 5.wav -- contains speakers: A, B, C, D, E

You want to train a model to classify portions of audio as one of the N known speakers in future conversations not included in your original training set.

f(audio) -> [(start_time, end_time, speaker), (start_time, end_time, speaker), ...]

i.e. f(audio) -> [(2.4, 10.5, "A"), (10.8, 14.1, "D"), (14.8, 22.7, "B"), ...]

The speakerbox library contains methods for both generating datasets for annotation and for utilizing multiple audio annotation schemes to train such a model.

Workflow

⚠️ speakerbox currently only works on Ubuntu due to upstream dependencies ⚠️

Diarization

We quickly generate an annotated dataset by first diarizing (or clustering based on the features of speaker audio) portions of larger audio files and splitting each the of the clusters into their own directories that you can then manually clean up (by removing incorrectly clustered audio segments).

Notes

• It is recommended to have each larger audio file named with a unique id that can be used to act as a "conversation id".
• Diarization time depends on machine resources and make take a long time -- one potential recommendation is to run a diarization script overnight and clean up the produced annotations the following day.
• During this process audio will be duplicated in the form of smaller audio clips -- ensure you have enough space on your machine to complete this process before you begin.
• Clustering accuracy depends on how many speakers there are, how distinct their voices are, and how much speech is talking over one-another.
• If possible, try to find meetings where speakers have a roughly uniform distribution of speaking durations.

from speakerbox import preprocess

diarized_and_split_audio_dir = preprocess.diarize_and_split_audio("0.wav")

Cleaning

Diarization will produce a directory structure organized by unlabeled speakers with the audio clips that were clustered together.

For example, if "0.wav" had three speakers, the produced directory structure may look like the following tree:

0/
├── SPEAKER_00
│   ├── 567-12928.wav
│   ├── ...
│   └── 76192-82901.wav
├── SPEAKER_01
│   ├── 34123-38918.wav
│   ├── ...
│   └── 88212-89111.wav
└── SPEAKER_02
    ├── ...
    └── 53998-62821.wav

We leave it to you as a user to then go through these directories and remove any audio clips that were incorrectly clustered together as well as renaming the sub-directories to their correct speaker labels (from "SPEAKER_00", "SPEAKER_01", "SPEAKER_02", etc. to "A", "B", "C", etc.).

Notes

• Most operating systems have an audio playback application to queue an entire directory of audio files as a playlist for playback. This makes it easy to listen to a whole unlabeled sub-directory (i.e. "SPEAKER_00") at a time and pause playback and remove files from the directory which were incorrectly clustered.

Training Preparation

Once you have annotated what you think is enough conversations, you can try preparing a dataset for training.

The following functions will prepare the audio for training by:

1. Finding all labeled audio clips in the provided directories
2. Chunk all found audio clips into smaller duration clips (parametrizable)
3. Check that the provided annotated dataset meets the following conditions:
   1. There is enough data such that the training, test, and validation subsets all contain different conversation ids.
   2. There is enough data such that the training, test, and validation subsets each contain all labels present in the whole dataset.

Notes

• During this process audio will be duplicated in the form of smaller audio clips -- ensure you have enough space on your machine to complete this process before you begin.
• Directory names are used as conversation ids during dataset construction.

from speakerbox import preprocess

dataset = preprocess.expand_labeled_diarized_audio_dir_to_dataset(
    labeled_diarized_audio_dir=[
        "0/",  # The cleaned and checked audio clips for conversation id 0
        "1/",  # ... conversation id 1
        "2/",  # ... conversation id 2
        "3/",  # ... conversation id 3
        "4/",  # ... conversation id 4
        "5/",  # ... conversation id 5
    ]
)

dataset_dict, value_counts = preprocess.prepare_dataset(dataset)

# You can print the value_counts dataframe to see how many audio clips of each label
# (speaker) is present in each data subset.
print(value_counts)

Model Training and Evaluation

Once you have your dataset prepared and available, you can provide it directly to the training function to begin training a new model.

The eval_model function will store a filed called results.md with the accuracy, precision, and recall of the model and additionally store a file called validation-confusion.png which is a confusion matrix.

Notes

• The model (and evaluation metrics) will be stored in a new directory called trained-speakerbox (parametrizable).
• Training time depends on how much data you have annotated and provided.
• It is recommended to train with an NVidia GPU with CUDA available to speed up the training process.

from speakerbox import train, eval_model

# dataset_dict comes from previous preparation step
train(dataset_dict)

eval_model(dataset_dict["valid"])

Development

See CONTRIBUTING.md for information related to developing the code.

MIT license