3 ms·
The article explains \hat{} as meaning a vector of unit length but in my experience in ML it nearly always designates an estimate (including in the first expres
by canjobear 7y ago
The article explains \hat{} as meaning a vector of unit length but in my experience in ML it nearly always designates an estimate (including in the first expression in this article).
- qayxc 7y agoYeah, that one irritated me too. There's no "standard" meaning for \hat{}. I often see it used to denote the global mean as well.
- enriquto 7y agoFor me it's most often the Fourier transform.
- newen 7y agoLol yeah. You are probably best off thinking of x-hat as a completely different letter to x, where x-hat is useful because it looks like x, and so you can talk about an object x-hat that has some relation to the object x without losing track of which objects you are talking about. x-dot and x-tilde are also in the same family and I'm sure there are lots of other symbols that people have put on top of x too.