Mandatary used in a sentence

Mandatary in a sentence as a noun

It's not mandatary, but for some problems such as using image data, it provides as substantial speedup when training a classifier.

I think it should be mandatary for every site to offer content that degrades to an useable version when used without JavaScript.

Would be nice to have a law for mandatary differential privacy for ad based social networks.--Perhaps I am losing out on ignoring all ads wholesale like that.

I am rather confused:Should the car always respond by slow down as the mandatary response when there is object in front?Are you implying that the algorithm would conclude that because it's unlikely that there is an object in that circumstance, it is ok to disapprove its own observation that there is some thing in front of the car?