A combination of words that are infrequently observed in natural language. For example in the preceding sentence some of the 3-grams are "combination of words", "infrequently observed in", and "words that are". N-grams are just this for all values of n. They are saying that often times the exact sequence of a short fragment of text is not very common in human written text.
Unusual word combinations, basically. They’re word combinations that are rare in the training data, i.e. rare in normal language, but used more frequently by AI.
They’re difficult for humans because if a sequence of words hasn’t previously been seen, you have to expend more effort to make sense of it.
Something like “customer onboarding workflow automation" might qualify - it makes sense, but it’s not a commonly used phrase. AIs use a lot of these jargony sequences.
Also, that particular product was disappointing compared to everything else they made - there was a full split keyboard, a half keyboard (about the size of the iGesture pad but had at least 5-finger multi touch as well as being combined keyboards and touchpads - the same "win" as the thinkpad or j-mouse, you can do gestural stuff without your hands leaving the keyboard.) Still had a lot of learning curve but they had broad sweeping gestures for open/close file and the like - though the one really odd one that I remember was "touch all four corners simultaneously" which would cause the keyboard to "type" about 80 characters of product and firmware version and "mode" information. (At the time all of the gestural mapping was in the keyboard itself, no drivers needed - and you could toggle some of the general "editing" gestures among windows/mac/emacs/vi presets.)
(PC Mag gave this device 3 stars out of 5 in 2005. Later that year, Apple quietly acquired FingerWorks and the technology driving the iGesture Pad became Multitouch on the iPhone)
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