You're right, of course. My point is literary grade is not an invariant, it changes with time and culture and the historical events of a given community. There

You're right, of course. My point is literary grade is not an invariant, it changes with time and culture and the historical events of a given community. There are so many cases of artists being considered shit one period, good another century, then shit again, indifferent or even canonic for a while. What exactly should data science train for a universal literary / not literary classifier then? Or unsupervised learning for clustering what? HN is full of bright minds, so I'm sure a formula might be reasonably suggested, but that's not the point of literature as a form of its own, like maths or music.