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Merged
merged 6 commits into from
Aug 25, 2025
Merged

Coalesce function and state for coo graphs #613

merged 6 commits into from
Aug 25, 2025

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dferre97
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@dferre97 dferre97 commented Aug 6, 2025

Added a coalesce method and an is_coalesced flag to keep track of whether a COO graph is coalesced, which means:

  • there are no duplicated coordinates in the indices (i.e, no multi-edges)
  • the source and target indices are ordered lexicographically (by source, then by target)

Some operations (e.g., sparse matrix multiplication in forward pass) could be implemented more efficiently if a COO graph is coalesced.

@CarloLucibello
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can you test that operations like add_edges returning a new graph set coalesce to false?
Also we should add an expose an is_coalesced(g) method just returning g.is_coalesced.

@CarloLucibello CarloLucibello merged commit a0a7fad into JuliaGraphs:master Aug 25, 2025
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@dferre97 dferre97 deleted the df/coo-coalesce_graph branch August 26, 2025 08:06
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@dferre97 @CarloLucibello