I was doing some stuff for my computer science class, and it was talking about the vectorized form of unregularized logistic regression and I'm pretty bad at matrices and when I saw this symbol I was completely stumped. (I'm sorry for not pasting the text it wasn't coming out right so I am using an image)
Here is an image for what I am asking. The notation is above the y:
sorry for having not many specifics. Thanks for any help you could give me!
$\large \vec y$ denotes a vector; for example, $\large\vec y=(y_1,y_2,...,y_n)$ is an $n$-tuple in $\Bbb R^n$,
where $y_1,y_2,...,y_n\in\Bbb R$. Such a vector could be multiplied by a scalar and/or a matrix.