Editing Nonlinear dimensionality reduction (section)

=== Contagion maps ===

Contagion maps use multiple contagions on a network to map the nodes as a point cloud.<ref>{{cite journal |last1=Taylor |first1=D. |last2=Klimm |first2=F. |last3=Harrington |first3=H. A. |last4=Kramár |first4=M. |last5=Mischaikow |first5=K. |last6=Porter |first6=M. A. |last7=Mucha |first7=P. J. |year=2015 |title=Topological data analysis of contagion maps for examining spreading processes on networks |journal=Nature Communications |volume=6 |pages=7723 |doi=10.1038/ncomms8723 |pmid=26194875 |pmc=4566922 |arxiv=1408.1168 |bibcode=2015NatCo...6.7723T }}</ref> In the case of the [[Global cascades model]] the speed of the spread can be adjusted with the threshold parameter <math> t \in [0,1] </math>. For <math> t=0 </math> the contagion map is equivalent to the [[Isomap]] algorithm.