Saturating the Graph #467
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Saturating the Graph #467
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In HNSW some nodes may become disconnected from the rest of the graph. New `unreachable_nodes` API allows retrieving the number of such entries. On a real-world Wiki1M dataset around 0.1% nodes are isolated.
Sometimes, knowing `disconnected_nodes()` number is not enough. To know exactly which nodes are disconnected from the member nodes of the current level, the upgraded API returns a `bitset_t`. Moreover, multiple nodes may have links referencing each-other and forming a connected component, but still be disconnected from the rest of the hierarchical graph. To detect those - a new `unreachable_nodes()` API was added. This patch also refactors `bitset_gt` and `ring_gt`, extending their functionality and fixing compilation errors.
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