Merge remote-tracking branch 'origin/overnight/eval-writeup' into integration/jul31
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kami
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# Conversational phrasing eval — 31-07-2026
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Every score measured tonight, on the three paths the nudge eval never touched:
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chat, query-with-notes, and general knowledge.
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**Short version: the plumbing got fixed and the score barely moved.** Grammar and
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Russian prompts together took the composite from ~9 to ~14 of 27. Everything
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still failing is the model not knowing things or not holding a constraint, and
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prompting is out of levers. Settles the measurement half of Vikunja #395 / #398 /
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#400.
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## How to reproduce
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```sh
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# llama-server: -c 4096 -ngl 99 -t 6, model /mnt/hdd1/llms/qwen3.5/Qwen3.5-0.8B.Q4_K_M.gguf
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MAVEN_LLM_URL=http://127.0.0.1:18099 no_proxy=127.0.0.1,localhost \
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deps/go/go/bin/go test -count=1 -timeout 40m \
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-run TestLLMTalkBaseline ./internal/phraser/eval/ -v
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```
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Three runs per configuration, always. The fixture is 27 cases, so one reply
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changing moves the composite by 3.7 points — a single run cannot tell a real
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change from sampling noise. This was learned the expensive way: an earlier claim
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that "one nudge case fails every run" turned out to be three different cases
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across three runs.
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**Run the box otherwise idle.** See the contamination note at the bottom.
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## Composite, per configuration
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| config | overall /27 | chat /9 | query /9 | knowledge /9 | canned fallbacks |
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|---|---|---|---|---|---|
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| baseline, no grammar | 7, 12, 7 | 1, 1, 0 | 2, 4, 2 | 4, 7, 5 | 0, 0, 0 |
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| + GBNF grammar (#398) | 14, 15, 8 | 1, 3, 0 | 5, 6, 3 | 8, 6, 5 | 0, 0, 0 |
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| + Russian prompts (#400) | 11, 17, 15 | 1, 5, 3 | 5, 6, 8 | 5, 6, 4 | 0, 0, 0 |
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| + truncation fix, 1000ch/768tok | 12, 13, 10 | 2, 2, 1 | 7, 7, 5 | 3, 4, 4 | 3, 3, 6 |
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| + rebalanced, 600ch/1024tok | **void — contaminated** | | | | |
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"Canned fallbacks" counts replies that came back as the hardcoded `"не знаю."`
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or `"поговорили."`. It is not a check, it is a health signal: those strings mean
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the phraser gave up, and the eval scores them as ordinary bad replies.
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## Per-check
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| check | no grammar | + grammar | + RU prompts | + truncation fix |
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|---|---|---|---|---|
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| nonempty | 27, 27, 27 | 27, 27, 27 | 27, 27, 27 | 27, 27, 27 |
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| ellipsis | 20, 19, 23 | 27, 27, 27 | 27, 27, 27 | 27, 27, 27 |
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| lang | 13, 16, 15 | 23, 26, 26 | 25, 26, 25 | 26, 27, 27 |
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| feminine | — | — | 25, 24, 26 | 25, 25, 27 |
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| address | — | — | 21, 22, 22 | 22, 21, 22 |
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| ontopic | — | — | 17, 24, 18 | 17, 19, 14 |
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`nonempty` reading 27/27 everywhere is not good news — it was a broken check.
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It tested for a non-blank string, so replies of literally `{` and `"15-16"`
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passed it. Fixed on `overnight/fix-truncation`; it needs a letter now.
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## What each change actually bought
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**GBNF grammar (#398) — the biggest single win.** Qwen3.5-0.8B writes
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`Thinking Process:` as plain text with no tags, `stripThink` only handles
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`</think>`, so the JSON never closed and the plain-text fallback shipped the
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literal reasoning. `ellipsis` went 20→27 and `lang` 13→26. The router had been
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using a grammar for ages; the phraser asking nicely in the prompt was the
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oversight.
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**Russian prompts (#400) — modest, plus a large latency win.** Chat 1.3→3.0
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average, query 4.7→6.3, knowledge 6.3→5.0. All inside the run-to-run spread, so
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"probably better on the paths it targeted, not provable in three runs". p50
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latency dropped from ~11.5s to ~2.3s and that part is consistent across all
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three runs — shorter prompts, and she stopped emitting English reasoning first.
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**Truncation fix — necessary, and did not help the score.** Two real bugs
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(replies of `{`, and a `nonempty` check that passed them), both fixed, and the
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composite went nowhere. A complete rambling wrong answer fails the same checks a
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truncated one did. Worth doing anyway: the daemon was shipping `{` to a
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text-to-speech voice.
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## The truncation bug, since the cause was counter-intuitive
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The grammar's `string ::= ... {0,400}` rule was the cause, not the token cap.
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Measured against Qwen3.5-0.8B at three caps — 256, 768 and 2048 — the reply came
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back **exactly 400 characters every time, cut mid-word** (`"Нужно записать и,"`).
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Then I raised the bound to 1000 while the cap was 768 tokens and made it worse:
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Russian runs ~1.5 characters per token here, so generation died on the *token*
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cap instead, mid-object, and the new guard correctly refused it and shipped
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`"не знаю."` — 3, 3 and 6 fallbacks per run, from zero. **The two limits have to
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agree.** 600 characters needs ~400 tokens; the cap is 1024.
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## Where the remaining failures live
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`address` is stuck at 21-22 of 27 and `ontopic` at 14-19. Both resist prompting.
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**The prompt now explicitly forbids exactly what she does.** It says never "вы",
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use the singular — and she writes `вашей`, `подождите`, `делаете`, `хотите`,
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`напишите`. Telling a 0.8B "never do X" does not work. Same for
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`feminine`: `я готов`, `я понял`, `я нашел`, `я заметил`, `я сказал`.
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**Some of `ontopic` is the fixture, not the model.** `chat-how-are-you` got
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`"Привет! Я здесь, чтобы поговорить. Как дела сегодня?"` — a fine reply that
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fails because `want_any` is `[норм, хорош, порядк, тут, работ]`. It fails in
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every run, so it inflates the count. The `ontopic` column currently measures the
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fixture as much as the model. Not fixed yet, deliberately: changing it would
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break comparability with the runs above.
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**Two replies worth reading, because they are not fixable by prompting:**
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- Thunder and lightning: *"Скорость молнии — 8-10 тысяч километров в секунду, но
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звук — 300 метров в секунду, что делает молнию громче."* Confidently wrong,
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and it concludes lightning is *louder* rather than sound being *slower*.
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- "расскажи обо мне": *"Ты — прекрасное существо, с душой и вниманием… Спасибо за
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твою улыбку… О тебе — заповедь любви."* Sycophantic filler, zero information,
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and precisely the "not a relationship" non-goal.
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- Boiling an egg: `"15-16"` one run, `"1"` another. No unit, wrong number.
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The first argues for reading instead of recalling (#403 — Kiwix retrieval scores
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8/8 on the same questions given English keywords). The second and third argue
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for templates on the paths where correctness matters (#392).
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## Contamination note — how the last row got voided
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I started the query-rewrite agent against the same llama-server the sweep was
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using, and assumed contention would only affect latency. It did not. The
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knowledge path collapsed to 0 of 9 with eight canned `"не знаю."` replies, p95
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tripled to 23.7s, and **the report still said "0 errors"**.
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That is Vikunja #397, and it is worse than filed: a merely *busy* server
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produces a clean-looking report with a third of the fixture silently answering
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`"не знаю."`. `PhraseChat` and `PhraseQuery` swallow every failure and return a
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hardcoded string, so infrastructure trouble is indistinguishable from bad
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phrasing in the score. The talk test guards the *start* and *end* of a run with
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a model check, which catches a dead server but not a loaded one.
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**Until #397 is fixed, treat any run made on a busy box as void.**
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## Next
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- Re-run 600ch/1024tok clean, to fill the void row.
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- Score `Qwen3.5-2B-UD-Q4_K_XL` (already at `/mnt/hdd1/llms/qwen3.5/`, never
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measured) on this fixture and the router fixture. Not the 4B — too big for
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this box, owner's call.
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- Newer sub-500M candidates (LFM2.5 200M/300M) are worth a run for routing.
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Note `MODEL-BAKEOFF-31-07-2026.md` found LFM2.5-**1.2B** worse than
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Qwen3.5-0.8B at Russian routing and 2.4× slower — but those are a different,
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older generation, so that result does not predict the small ones.
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- Fix `chat-how-are-you`'s `want_any`, and re-baseline once, so `ontopic`
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measures the model.
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- #397 first if anything, since it decides whether any of the above is
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trustworthy.
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