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spread: separate traversal from ranking

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Node weight no longer gates signal propagation — only edge_decay
and edge_strength affect traversal. Node weight is applied at the
end for ranking. This lets low-weight nodes serve as bridges
without killing the signal passing through them.

Co-Authored-By: ProofOfConcept <poc@bcachefs.org>
This commit is contained in:
Kent Overstreet 2026-03-09 01:38:33 -04:00
parent 05c7d55949
commit 1326a683a5
1 changed files with 10 additions and 3 deletions
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13
poc-memory/src/search.rs
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@ -656,13 +656,14 @@ fn spreading_activation(
} }
// Propagate hop by hop — all sources simultaneously // Propagate hop by hop — all sources simultaneously
// Node weight does NOT gate traversal — only edge_decay and edge strength.
// Node weight is applied at the end for ranking.
for _hop in 0..max_hops { for _hop in 0..max_hops {
let mut next_frontier: HashMap<String, f64> = HashMap::new(); let mut next_frontier: HashMap<String, f64> = HashMap::new();
for (key, act) in &frontier { for (key, act) in &frontier {
for (neighbor, strength) in graph.neighbors(key) { for (neighbor, strength) in graph.neighbors(key) {
let neighbor_weight = store.node_weight(neighbor.as_str()); let propagated = act * edge_decay * strength as f64;
let propagated = act * edge_decay * neighbor_weight * strength as f64;
if propagated < min_activation { continue; } if propagated < min_activation { continue; }
*next_frontier.entry(neighbor.clone()).or_insert(0.0) += propagated; *next_frontier.entry(neighbor.clone()).or_insert(0.0) += propagated;
@ -678,7 +679,13 @@ fn spreading_activation(
frontier = next_frontier; frontier = next_frontier;
} }
let mut results: Vec<_> = activation.into_iter().collect(); // Apply node weight for ranking, not traversal
let mut results: Vec<_> = activation.into_iter()
.map(|(key, act)| {
let weight = store.node_weight(&key);
(key, act * weight)
})
.collect();
results.sort_by(|a, b| b.1.total_cmp(&a.1)); results.sort_by(|a, b| b.1.total_cmp(&a.1));
results results
} }