Presentation - citations on the title? How uncommon or weird is it to put my citations in a powerpoint slide at the title ? I really want to put the citations in the slide and not only at the very end.
Slides are different beasts from papers and the style should match the medium. For example, we usually enumerate equations in papers, but shall we do it on slides? Clearly, readers can not go back until the presenter himself does it, so why wasting space on numbers in the first place?

Applying it to your example: why would you need [1]? Simply put reference if you feel it's needed. Or symbolise, [Kingma et al 2015].