Graph multiresolution: eps computation

[mys007]

The current code throws "GSP_GRAPH_SPARSIFY: Epsilon out of required range" if gsp_graph_multiresolution() comes to the point that the current graph has three nodes. I think L175 in gsp_graph_multiresolution.m should be if Gs{lev+1}.N>3 as 2/sqrt(3)>1, a condition in gsp_graph_sparsify(). Another useful condition would be sum(find(Gs{lev+1}.A,1))>0 as otherwise there is nothing to sparsify and this later leads to error in results=gendist(Pe',q,1);.
In addition a piggy-backed comment: gsp_graph_sparsify() should be documented that it is non-deterministic.

[mdeff]

Thanks for reporting the issue. Note however that this toolbox is not developed nor maintained anymore. Please consider using the pygsp instead.