nx-cugraph: add CC for undirected graphs to fix k-truss #3965
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Fixes #3963 and add
connected_components
,is_connected
,node_connected_component
, andnumber_connected_components
.Also updated
_groupby
to handle groups that are not consecutive integers starting with 0.Also,
plc.weakly_connected_components
does not handle isolated nodes well, and I needed to handle this at the Python layer as was done in #3897