Function attn_path 

pub fn attn_path(z: usize, side: usize, splits: usize) -> &'static str

The path an attention launch takes past a row of one chunk (lk_attention‘s PATH, lk_attn_path), fixed where it launches so its kernel compiles that path alone and ptxas allots its registers to it: the chunks’ partials of a grid of z split blocks a row folded by the last to arrive, held side by side by the row’s one block (side chunks at a time), weighed one at a time by it, or none where a row is one chunk (splits 1).