SEA MADLAD is a subset of MADLAD-400 (Multilingual Audited Dataset: Low-resource And Document-level), which is a document-level multilingual dataset based on Common Crawl.
SEA MADLAD only filters the language of the "clean" subset, which covers 36 languages indigenous to SEA from 419 languages in total.
As a result, some of SEA lang codes aren't available in this version because those belongs to the languages whose decision was to "remove from its clean version" based on MADLAD auditing… See the full description on the dataset page:
https://huggingface.co/datasets/SEACrowd/sea_madlad.
