How to determine whether the graph is convex or not? I did not understand at 1:49…Please explain
Convex Optimisation
Hey @settingsingh,
Proving a function convex is a bit complicated task.
Let’s talk about |x| mod(x) function. We know that this function is not continuous at point x=0. So this cannot be a convex function.
On other hand, believe on the fact that x2 function is a convex function bcoz it is continuous everywhere ( satisfies other conditions as well ). That’s why in linear regression case we converted the function into squared function. In our course, we will see convex function which are convex downward function (something like x2 ). So if any function is like that , we would call that a convex function.
To read more about convex function refer this blog
Thanks 
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