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Fix: Avoid duplicate neighbor slots in HNSW reverse links #699

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Fix: Avoid duplicate neighbor slots in HNSW reverse links #699

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6 changes: 5 additions & 1 deletion include/usearch/index.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3899,7 +3899,11 @@ class index_gt {
// If `new_slot` is already present in the neighboring connections of `close_slot`
// then no need to modify any connections or run the heuristics.
if (close_header.size() < connectivity_max) {
close_header.push_back(new_slot);
if (std::all_of(close_header.begin(), close_header.end(), [new_slot](compressed_slot_t slot) {
return slot != new_slot;
})) {
close_header.push_back(new_slot);
}
continue;
}

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