perf: single-pass _sparse_nanmean (#1894)#4141

Lawson-Darrow wants to merge 2 commits into

scverse:mainscverse/scanpy:mainfrom

Lawson-Darrow:perf/sparse-nanmean-single-pass-1894Lawson-Darrow/scanpy:perf/sparse-nanmean-single-pass-1894Copy head branch name to clipboard