The authors of the paper are
Wu, Siqi Joseph, Antony Hammonds, Ann S. Celniker, Susan E. Yu, Bin Frise, Erwin
Stability-driven nonnegative matrix factorization to interpret spatial gene expression and build local gene networks
PNAS 2016 (v113, iss 16)
This package simply reorganizes (and tweaks) code and data at insitu.fruitfly.org, for teaching purposes
The code authors are not explicitly identified in the distribution of code at insitu.fruitfly.org. I hope they will take over this repo.