Demo note. This note demonstrates what the SciDraft Hugo theme can do for academic and scientific publishing — for research institutions, researchers and students. Its content is demonstration material only: readers should ignore whether the demo content is correct. Multi-head attention reads better as shape bookkeeping than as prose: every symbol below is a tensor, and the shapes alone decide which products are legal, which is why papers about attention variants usually open with a notation table before showing a single result. ...