335c33465b76eed6240ae9ce5982a8017ce84de1
2 Commits
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 justin
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335c33465b |
Phase 7+8: eval harness + hybrid retrieval
## Phase 7 — Eval harness
eval/retrievers.py + rag/retrieval.py: Retriever protocol with
DenseRetriever, BM25Retriever, HybridRetriever (RRF k=60),
RerankedRetriever (llama.cpp /v1/rerank). retrievers.py is now a
thin shim re-exporting from rag.retrieval so the MCP server can
use the same code at request time without making eval/ a runtime
dep.
eval/run_eval.py: drives N retrievers against eval/queries.jsonl,
computes MRR / Recall@K / nDCG@K, emits a markdown report with a
summary table + per-query breakdown for the first retriever. Each
query carries expected (source, source_key) tuples — matches the
labels-domain page-level keying.
eval/queries.jsonl: 35 curated queries — 25 brand-name (Warrant,
Huskie, Roundup Custom, Liberty, Authority, Headline, Trivapro,
Poncho, Lorsban, Sencor, Acuron, ...) + 10 intent/semantic
("what controls horseweed before soybean", "fungicide for fusarium
head blight", "rainfast interval for glyphosate", ...).
## Phase 8 — Hybrid retrieval (BM25 + dense + RRF)
docs_mcp/server.py: search_docs now branches on HYBRID_SEARCH env.
When on, _search_chunks runs both Chroma + BM25 (rag/bm25.py
existing impl), fuses on chunk_id with reciprocal-rank-fusion
(RRF k=60), and returns the combined pool. Dense-only path
unchanged when HYBRID_SEARCH is unset. The rendering layer
(_format_hit) is untouched.
The RERANK_URL hook is also wired (_rerank_pool sends docs to
llama.cpp /v1/rerank, truncated to 2000 chars per the jina-reranker
n_ctx_train=1024 batch-rejection gotcha). Fails open to base order
on any exception.
## Baseline numbers (k=5, pool=50, 35 queries)
| Retriever | MRR | Recall@5 | nDCG@5 |
|------------|-------|----------|--------|
| dense | 0.027 | 0.086 | 0.041 |
| bm25 | 0.544 | 0.586 | 0.524 |
| hybrid-rrf | 0.114 | 0.114 | 0.108 |
Headline: BM25 dominates because farmers search for products by
brand name, and brand names are exact-match tokens that lexical
search nails. Dense is poor — semantic embeddings spread across
similar products and don't preferentially weight brand-name tokens.
Textbook RRF hurts when one retriever is much weaker than the
other: dense's irrelevant top-50 pollute the fused pool with
ties at 1/(60+rank). Phase 6 reranker is the planned fix —
the reranker scores each (query, chunk) pair independently
and can recover the right answer regardless of base order.
Per-query report at eval/results/baseline.md.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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justin
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9ba615c8ee |
initial: docs-mcp-template — build guide + scaffolded server
Template for building hosted MCP servers over a product's public
documentation. Distilled from one production build; everything
product-specific has been factored out.
Contents:
- PLAN.md — comprehensive build guide. 13 phases from project
skeleton through weekly_digest. Includes the gotchas
("fetch-depth: 0 always", reranker per-pair token limit,
Cloudflare body cap, dash-not-bash on Gitea runners), the
decisions worth carrying forward, and a per-product
customization checklist.
- CLAUDE.md — guidance for Claude Code working in a clone of this
template. Phase identification table, conventions (env-gating +
operator confirmation for side-effecting tools, defensive
fallback for retrieval components), common commands.
- README.md — quick-start summary.
Scaffolded code (all signature-stable, with NotImplementedError
stubs where phase-specific work is required):
docs_mcp/server.py FastMCP server, stateless_http=True, with
search_docs / get_page / list_versions
baseline tools and commented stubs for the
rest of the phase set.
docs_mcp/usage.py TimedCall telemetry, JSONL, daily rotation,
90-day retention. Reusable as-is.
rag/embeddings.py Ollama embedder (nomic-embed-text default),
load-balanced across N URLs. Reusable.
rag/chunk.py Paragraph-aware chunker with synthetic
chunk 0. Per-product tunable.
rag/index.py Chroma + BM25 builder. --rebuild and
--bm25-only flags.
rag/bm25.py SQLite FTS5 lexical index. Reusable.
scrape/changelog.py --cached / --ref / --json / --history-out.
Reusable.
scrape/README.md What you write per-product.
eval/queries.jsonl.example
Curate ~25 hand-labeled queries here.
eval/retrievers.py Retriever protocol + stub classes.
eval/run_eval.py MRR / Recall@K / nDCG@K harness skeleton.
scripts/usage_report.py
Standalone log analyzer; the
FOLLOW-UP CHECKS pattern noted in the
module docstring.
scripts/registry_gc.py
Gitea container registry cleanup. Reusable.
Deployment + CI:
Dockerfile Python 3.12-slim; COPY corpus + chroma
+ bm25 last for cache efficiency.
deploy/docker-compose.yml MCP + reranker sidecar + Watchtower.
Templated with <placeholders>.
.gitea/workflows/refresh.yml Weekly cron + manual dispatch.
fetch-depth: 0, retry-on-race,
three-tag image scheme.
.gitea/workflows/image-only.yml Code-only ship cycle, ~18min.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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