GPT-4o's Chinese token-training data is polluted by spam and porn websites

MIT Technology Review 

Humans read in words, but LLMs read in tokens, which are distinct units in a sentence that have consistent and significant meanings. Besides dictionary words, they also include suffixes, common expressions, names, and more. The more tokens a model encodes, the faster the model can "read" a sentence and the less computing power it consumes, thus making the response cheaper. Of the 100 results, only three of them are common enough to be used in everyday conversations; everything else consisted of words and expressions used specifically in the contexts of either gambling or pornography. The longest token, lasting 10.5 Chinese characters, literally means "_free Japanese porn video to watch."