  We introduce VoxPopuli, a large-scale multilingual corpus providing 100K
hours of unlabelled speech data in 23 languages. It is the largest open data to
date for unsupervised representation learning as well as semi-supervised
learning. VoxPopuli also contains 1.8K hours of transcribed speeches in 16
languages and their aligned oral interpretations into 5 other languages
totaling 5.1K hours. We provide speech recognition baselines and validate the
versatility of VoxPopuli unlabelled data in semi-supervised learning under
challenging out-of-domain settings. We will release the corpus at
https://github.com/facebookresearch/voxpopuli under an open license.
