Communities
How to create and update communities
In Graphiti, communities (represented as CommunityNode objects) represent groups of related entity nodes.
Communities can be generated using the build_communities method on the graphiti class.
Communities are determined using the Leiden algorithm, which groups strongly connected nodes together. Communities contain a summary field that colates the summaries held on each of its member entities. This allows Graphiti to provide high-level synthesized information about what the graph contains in addition to the more granular facts stored on edges.
Once communities are built, they can also be updated with new episodes by passing in update_communities=True to the add_episode method.
If a new node is added to the graph, we will determine which community it should be added to based on the most represented community of the new node’s surrounding nodes.
This updating methodology is inspired by the label propagation algorithm for determining communities.
However, we still recommend periodically rebuilding communities to ensure the most optimal grouping.
Whenever the build_communities method is called it will remove any existing communities before creating new ones.