PageRank presents with an error

[nsalomonis]

ICGS-NMF errors when performing Down-Sampling

The error specifically is encountered in the PageRankSampling function of the ICGS_NMF module in the networkx library when calling:
neighbours=list(G.adj[key1])

producing a KeyError for return AtlasView(self._atlas[name])

The error can be overcome by increasing the down-sampling threshold (default = 2500 cells), however, the down-sampling option is not available in the version 2.1.4.2 GUI.

[nsalomonis]

There are two interim solutions introduced in version 2.1.4.3 to solve this problem:

1. Enable the end-user to increase the down-sampling threshold in the GUI by adding the option: (optional) Cells to down-sample to (PageRank).
2. Automatically catch any errors in the PageRankSampling function and increase in the number of cells to downsample to by 1000 (while loop). Typically, setting the option to 5000 in the GUI or command-line (--downsample 5000), resolves this problem by selecting more cells for down-sampling.