Yoruba-English Code-Switching (YECS) Corpus | Mozilla Data Collective

The Yoruba-English Code-Switching (YECS) Corpus is a comprehensive, ~120-hour dataset designed to capture the natural linguistic phenomenon of intra-sentential code-mixing. Curated by the LynguaTech Innovative Foundation (LyngualLabs), this dataset provides nearly 100,000 validated audio-text pairs recorded by 140 demographically diverse bilingual speakers in Nigeria. It features clean speech recordings paired with full Yoruba orthography (including verified tonal marks and diacritics), word-level language identification tags, and rich metadata spanning 16 semantic domains and 7 emotion categories. The dataset is explicitly partitioned to prevent data contamination, serving as a highly stratified, robust benchmark for low-resource speech technologies.