Computing the neighborhood graph in single cell pipeline

Question

[QX]

Hi all,

In the single-cell analysis, there is a step called "Computing the neighborhood graph". Can anyone explain why we need to perform this step and why is it computed on a reduced dimensional space?

Also, can anyone have the code to perform the computation for this step that would like to share?

Best,

[ATpoint]

https://bioconductor.org/books/release/OSCA/ please go through that