README.md

metadata

license:
  - cc-by-sa-4.0
  - cc-by-4.0
annotation_creators:
  - human-annotated
  - crowdsourced
language_creators:
  - creator_1
tags:
  - audio
  - automatic-speech-recognition
  - text-to-speech
language:
  - ach
  - aka
  - dag
  - dga
  - ewe
  - fat
  - ful
  - hau
  - ibo
  - kpo
  - lin
  - lug
  - mas
  - mlg
  - nyn
  - sna
  - sog
  - swa
  - twi
  - yor
multilinguality:
  - multilingual
pretty_name: Waxal NLP Datasets
task_categories:
  - automatic-speech-recognition
  - text-to-speech
source_datasets:
  - UGSpeechData
  - DigitalUmuganda/AfriVoice
  - original
configs:
  - config_name: asr
    data_files:
      - split: train
        path: data/ASR/**/*-train-*
      - split: validation
        path: data/ASR/**/*-validation-*
      - split: test
        path: data/ASR/**/*-test-*
      - split: unlabeled
        path: data/ASR/**/*-unlabeled-*
  - config_name: tts
    data_files:
      - split: train
        path: data/TTS/**/*-train-*
      - split: validation
        path: data/TTS/**/*-validation-*
      - split: test
        path: data/TTS/**/*-test-*
dataset_info:
  - config_name: asr
    features:
      - name: id
        dtype: string
      - name: speaker_id
        dtype: string
      - name: transcription
        dtype: string
      - name: language
        dtype: string
      - name: gender
        dtype: string
      - name: audio
        dtype: audio
  - config_name: tts
    features:
      - name: id
        dtype: string
      - name: speaker_id
        dtype: string
      - name: transcription
        dtype: string
      - name: locale
        dtype: string
      - name: gender
        dtype: string
      - name: audio
        dtype: audio

Waxal Datasets

Table of Contents

• Dataset Description
  • ASR Dataset
  • TTS Dataset
  • How to Use
• Dataset Structure
  • ASR Data Fields
  • TTS Data Fields
  • Data Splits
• Dataset Curation
• Considerations for Using the Data
• Additional Information

Dataset Description

The Waxal project provides datasets for both Automated Speech Recognition (ASR) and Text-to-Speech (TTS) for African languages. The goal of this dataset's creation and release is to facilitate research that improves the accuracy and fluency of speech and language technology for these underserved languages, and to serve as a repository for digital preservation.

The Waxal datasets are collections acquired through partnerships with Makerere University, The University of Ghana, Digital Umuganda, and Media Trust. Acquisition was funded by Google and the Gates Foundation under an agreement to make the dataset openly accessible.

ASR Dataset

The Waxal ASR dataset is a collection of data in 14 African languages. It consists of approximately 1,250 hours of transcribed natural speech from a wide variety of voices. The 14 languages in this dataset represent over 100 million speakers across 40 Sub-Saharan African countries.

Provider	Languages	License
Makerere University	Acholi, Luganda, Masaaba, Nyankole, Soga	CC-BY-4.0
University of Ghana	Akan, Ewe, Dagbani, Dagaare, Ikposo	CC-BY-NC-4.0
Digital Umuganda	Fula, Lingala, Shona, Malagasy	CC-BY-4.0

TTS Dataset

The Waxal TTS dataset is a collection of text-to-speech data in 10 African languages. It consists of approximately 240 hours of scripted natural speech from a wide variety of voices.

Provider	Languages	License
Makerere University	Acholi, Luganda, Kiswahili, Nyankole	CC-BY-4.0
University of Ghana	Akan (Fante, Twi)	CC-BY-NC-4.0
Media Trust	Fula, Igbo, Hausa, Yoruba	CC-BY-4.0

How to Use

The datasets library allows you to load and pre-process your dataset in pure Python, at scale.

First, ensure you have the necessary dependencies installed to handle audio data:

pip install datasets[audio]

Loading ASR Data

To load ASR data, point to the data/ASR directory.

from datasets import load_dataset, Audio

# Load Shona (sna) ASR dataset
asr_data = load_dataset("google/WaxalNLP", "sna", data_dir="data/ASR")

# Access splits
train = asr_data['train']
val = asr_data['validation']
test = asr_data['test']

# Example: Accessing audio bytes and other fields
example = train[0]
print(f"Transcription: {example['transcription']}")
print(f"Sampling Rate: {example['audio']['sampling_rate']}")
# 'array' contains the decoded audio bytes as a numpy array
print(f"Audio Array Shape: {example['audio']['array'].shape}")

Loading TTS Data

To load TTS data, point to the data/TTS directory.

from datasets import load_dataset

# Load Swahili (swa) TTS dataset
tts_data = load_dataset("google/WaxalNLP", "swa", data_dir="data/TTS")

# Access splits
train = tts_data['train']

Dataset Structure

ASR Data Fields

{
  'id': 'sna_0',
  'speaker_id': '...',
  'audio': {
    'array': [...],
    'sample_rate': 16_000
  },
  'transcription': '...',
  'language': 'sna',
  'gender': 'Female',
}

• id: Unique identifier.
• speaker_id: Unique identifier for the speaker.
• audio: Audio data.
• transcription: Transcription of the audio.
• language: ISO 639-2 language code.
• gender: Speaker gender ('Male', 'Female', or empty).

TTS Data Fields

{
  'id': 'swa_0',
  'speaker_id': '...',
  'audio': {
    'array': [...],
    'sample_rate': 16_000
  },
  'transcription': '...',
  'locale': 'swa',
  'gender': 'Female',
}

• id: Unique identifier.
• speaker_id: Unique identifier for the speaker.
• audio: Audio data.
• transcription: Transcription.
• locale: ISO 639-2 language code.
• gender: Speaker gender.

Data Splits

For the ASR Dataset, the data with transcriptions is split as follows: * train: 80% of labeled data. * validation: 10% of labeled data. * test: 10% of labeled data.

The unlabeled split contains all samples that do not have a corresponding transcription.

The TTS Dataset follows a similar structure, with data split into train, validation, and test sets.

Dataset Curation

The data was gathered by multiple partners:

Provider	Dataset	License
University of Ghana	UGSpeechData	CC BY 4.0
Digital Umuganda	AfriVoice	CC-BY 4.0
Makerere University	Yogera Dataset	CC-BY 4.0
Media Trust		CC-BY 4.0

Considerations for Using the Data

Please check the license for the specific languages you are using, as they may differ between providers.

Affiliation: Google Research

Version and Maintenance

• Current Version: 1.0.0
• Last Updated: 01/2026