The print function does not return anything. It simply displays in the console
window general information about the paritioning (cluster ID, Size, and Diversity Score),
as well as cluster centroids (average profiles within each cluster) and the distance that has
been used.
References
Herrero, J., Valencia,
A, and Dopazo, J. (2005). A hierarchical unsupervised growing neural
network for clustering gene expression patterns. Bioinformatics, 17, 126-136.