an IDF score to each word in the in the sample and then they randomly sample or randomly swap out words and giving a higher likelihood to swap words that have a low IDF score so here you can see I've just sort of created this example and so in this case the words this in decides to etc are transformed or swapped but but the words that are a little bit more rare and therefore have a higher IDF score such as pathetically cringing lease poof those are more likely not to be swapped out and so that's yeah based on the intuition that certain keywords