sorokin.oleg.edu/learnharness
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 6 Wiki Activity

Semantic topic clusters: local embeddings replace Louvain

Browse Source 
Louvain only ever found the reasoning chains (the graph is disconnected
by nature — every connected component became its own cluster) and
edge-orphans could never join anything. Clusters are now RELATED TOPICS:
propositions grouped by meaning.

- Embedder (src/server/embeddings.ts): in-process transformers.js v4
  running EmbeddingGemma-300M q8 (MTEB 68.4, ~300MB one-time download),
  MRL-truncated to 512d, "title: none | text:" prefix on 100% of inputs,
  L2-normalized so cosine = dot. Model/dim mismatch voids the ledger
  (full re-embed). Injected at the composition root — the agent layer
  never imports the server layer (architecture law).
- Ledger (data/graph/embeddings.json): model + dim + vectors + the
  persisted cluster partition. Reclustering runs at the END of every
  embedding batch (post-merge hook, both front doors) — never per read
  (the agglomerative pass is ~1.5s at 338 nodes).
- Clustering (src/core/semantic-clusters.ts): hand-rolled average-linkage
  agglomerative over cosine (npm HDBSCAN is an abandoned alpha). Stragglers
  stay singletons by default; attachStragglers is the all-in toggle.
  Threshold 0.60 swept on the real graph: 26 topics, 74/90 edge-orphans
  land in real topics, 10 stragglers.
- Consumers (snapshot, settle, namer, replay) read the persisted
  partition — one cluster concept everywhere; core-survival label
  matching unchanged (20/26 topics kept labels).
- Louvain retired: detectCommunities + graphology* deps deleted
  (graphology-louvain had leaked into the client bundle since the
  clusters wave); scripts/bench-graph.ts (dead FA2 bench) removed.
- scripts/embed-graph.ts: backfill/cold-start (338 nodes in 150s
  including the one-time model download).
This commit is contained in:
amosblomqvist
2026-09-13 14:29:16 +03:00
parent 3a1c18b9de
commit f5edc7f0a5
28 changed files with 1443 additions and 431 deletions
Download Patch File Download Diff File Expand all files Collapse all files
scripts/backfill-graph.ts
+2 -1
View File
@@ -8,13 +8,14 @@
import { chatStore } from "../src/store/chats.ts";
import { graphStore } from "../src/store/graph.ts";
import { createExtractionPipeline } from "../src/agent/subagents/extraction.ts";
import { embedNewNodes } from "../src/server/embeddings.ts";
import { getGraph } from "../src/core/graph.ts";
async function main() {
const only = process.argv[2]; // optional: extract just one chat id
const chats = only ? chatStore.listChats().filter((c) => c.id === only) : chatStore.listChats();
console.log(`[backfill] ${chats.length} chats to extract`);
const pipeline = createExtractionPipeline({ chatStore, graphStore });
const pipeline = createExtractionPipeline({ chatStore, graphStore, embedder: embedNewNodes });
for (const chat of chats) {
const t0 = Date.now();
try {