  We introduce MADLAD-400, a manually audited, general domain 3T token
monolingual dataset based on CommonCrawl, spanning 419 languages. We discuss
the limitations revealed by self-auditing MADLAD-400, and the role data
auditing had in the dataset creation process. We then train and release a
10.7B-parameter multilingual machine translation model on 250 billion tokens
covering over 450 languages using publicly available data, and find that it is
competitive with models that are significantly larger, and report the results
on different domains. In addition, we train a 8B-parameter language model, and
assess the results on few-shot translation. We make the baseline models
available to the research community.
