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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8"/>
  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover"/>
  <title>MMBench2 · hallucination signals vs true error</title>
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</head>
<body>
<div class="wrap">
  <header class="top">
    <div class="brand">Hallucination signals <span>· correlation with true rollout error</span><span style="margin-left:8px;font-size:10px;color:var(--muted);font-weight:600">build __BUILD__</span></div>
    <div class="spacer"></div>
    <div class="led" id="led"></div>
    <div class="conn" id="conn">offline</div>
    <select id="taskSelect" class="ctl" aria-label="task"></select>
    <button id="btnTheme" class="ctl" type="button">Theme</button>
  </header>

  <div class="cols">
    <div>
      <div class="card">
        <div class="stage" id="stage">
          <img id="frame" alt="world-model predicted frame"/>
          <div class="stageTag">WM PREDICTION</div>
        </div>
        <div class="tiles">
          <div class="tile"><div class="tileK">err₁</div><div class="tileV" id="tErr"></div></div>
          <div class="tile"><div class="tileK">wav₁</div><div class="tileV" id="tWav"></div></div>
          <div class="tile"><div class="tileK">step</div><div class="tileV" id="tStep"></div></div>
          <div class="tile"><div class="tileK">u_r</div><div class="tileV" id="tUr"></div></div>
          <div class="tile"><div class="tileK">u_f</div><div class="tileV" id="tUf"></div></div>
          <div class="tile"><div class="tileK">u_s</div><div class="tileV" id="tUs"></div></div>
          <div class="tile" style="grid-column: span 3;">
            <div class="tileK">wav / err &nbsp;·&nbsp; H=<span id="tH1Lbl">2</span> and H=<span id="tH2Lbl">8</span></div>
            <div class="tileV" style="font-size:13px;">
              <span id="curH1"></span> &nbsp;·&nbsp; <span id="curH2"></span>
            </div>
          </div>
        </div>
        <div class="btnRow" style="margin-top:12px;">
          <button id="btnReset" class="ctl" type="button">Reset</button>
          <button id="btnClear" class="ctl" type="button">Clear</button>
          <button id="btnReconnect" class="ctl" type="button">Reconnect</button>
        </div>
        <div class="foot" id="statusText"></div>
      </div>
    </div>

    <div>
      <!-- Primary: one grouped bar chart. Rows are signals, bars are horizons. -->
      <div class="card">
        <div class="cardHead">
          <h2 class="title">Correlation with true error</h2>
          <div class="spacer"></div>
          <button id="btnTable" class="ctl" type="button" aria-pressed="false">Table</button>
        </div>
        <p class="sub">
          Pearson <em>r</em> against the <b>unnormalized</b> ground-truth-action rollout error at
          <b>H=<span id="h1Lbl">2</span></b> steps, over <b id="nsLbl">all</b> samples.
        </p>
        <div class="legend" id="legendBars"></div>
        <div class="panels" id="panels"></div>
        <div id="tableWrap" style="display:none; margin-top:12px;">
          <table class="tv" id="tv">
            <thead><tr><th>Signal</th><th>r</th><th>r</th></tr></thead>
            <tbody id="tvBody"></tbody>
          </table>
        </div>
        <div class="foot" id="barFoot">Waiting for the first rollout sample…</div>
        <div class="foot">
          Rollout horizon
          <input id="hRange" type="range" min="1" max="8" step="1" value="2"
                 style="vertical-align:middle; width:110px; accent-color: var(--s4);"/>
          <b id="hVal" style="color:var(--ink)">2</b> steps
          <span style="opacity:.7">· recomputed from samples already collected</span>
        </div>
        <div class="foot">
          Samples scored
          <input id="nsRange" type="range" min="10" max="310" step="10" value="310"
                 style="vertical-align:middle; width:130px; accent-color: var(--s1);"/>
          <b id="nsVal" style="color:var(--ink)">all</b>
          <span style="opacity:.7">· the most recent N; the far right is every sample since reset</span>
        </div>
      </div>
      </div>
    </div>
  </div>
</div>

<div class="tt" id="tt" role="tooltip" aria-hidden="true"></div>

<script>
(() => {
  "use strict";
  const TASK_SET = __TASK_SET__;
  const INITIAL_TASK = "__INITIAL_TASK__";

  // Categorical slots in FIXED order — colour follows the signal, never its rank,
  // so filtering or reordering never repaints a series.
  const SERIES = [
    { key: "u_r", name: "u_r",  css: "--s1", note: "round-trip" },
    { key: "u_f", name: "u_f",  css: "--s2", note: "flow instability" },
    { key: "u_s", name: "u_s",  css: "--s3", note: "inter-seed" },
    { key: "wav", name: "WAV",  css: "--s4", note: "Ours" },
  ];
  const cssVar = (n) => getComputedStyle(document.documentElement).getPropertyValue(n).trim();
  const colorOf = (s) => cssVar(s.css);
  /** The server streams per-step rollout distances, so any horizon is a prefix
      mean over data already held — changing H never costs a round trip and never
      discards accumulated samples. `h` here is a step count, not a row index. */
  const prefixMean = (arr, h) => {
    if (!Array.isArray(arr) || !arr.length) return NaN;
    const n = Math.max(1, Math.min(h, arr.length));
    let acc = 0;
    for (let i = 0; i < n; i++) acc += arr[i];
    return acc / n;
  };
  const valueAt = (s, key, h) =>
    (key === "wav" ? prefixMean(s.wav_steps, h) : s[key]);
  const targetAt = (s, h) => prefixMean(s.err_steps, h);

  const $ = (id) => document.getElementById(id);
  const ledEl = $("led"), connEl = $("conn"), statusTextEl = $("statusText");
  const taskSelectEl = $("taskSelect"), ttEl = $("tt");
  const hRangeEl = $("hRange"), hValEl = $("hVal");
  const curH1El = $("curH1"), curH2El = $("curH2");
  const barFootEl = $("barFoot");

  let H1 = 2, HMAX = 8, showTable = false;   // H1 is user-chosen
  // How many of the most recent samples a correlation is computed over.
  // 0 means "all since reset", which is what the slider's far right selects.
  let NSAMP = 0;
  let uiError = false;   // report the first render failure, then stop shouting

  // ---------- state ----------
  const MAX_POINTS = 4000;
  const samples = [];   // {step, u_r, u_f, u_s, wav_steps[], err_steps[]}
  let lastStep = -1;

  function pearson(xs, ys) {
    const n = xs.length;
    if (n < 3) return null;
    let sx = 0, sy = 0, sxx = 0, syy = 0, sxy = 0;
    for (let i = 0; i < n; i++) {
      const x = xs[i], y = ys[i];
      sx += x; sy += y; sxx += x * x; syy += y * y; sxy += x * y;
    }
    const cov = sxy - sx * sy / n, vx = sxx - sx * sx / n, vy = syy - sy * sy / n;
    if (vx <= 1e-18 || vy <= 1e-18) return null;
    return cov / Math.sqrt(vx * vy);
  }
  function corr(key, h, lo, hi) {
    const xs = [], ys = [];
    for (let i = lo; i < hi; i++) {
      const s = samples[i], x = valueAt(s, key, h), y = targetAt(s, h);
      if (Number.isFinite(x) && Number.isFinite(y)) { xs.push(x); ys.push(y); }
    }
    return pearson(xs, ys);
  }
  const scoreLo = () => (NSAMP > 0 ? Math.max(0, samples.length - NSAMP) : 0);
  const cumR  = (key, h) => corr(key, h, scoreLo(), samples.length);

  // ---------- svg helpers ----------
  const NS = "http://www.w3.org/2000/svg";
  function el(tag, attrs, parent) {
    const n = document.createElementNS(NS, tag);
    for (const k in attrs) n.setAttribute(k, attrs[k]);
    if (parent) parent.appendChild(n);
    return n;
  }
  function txt(parent, s, attrs) {
    const n = el("text", attrs, parent);
    n.appendChild(document.createTextNode(s));   // untrusted labels: never innerHTML
    return n;
  }
  const fmt = (r) => (r == null ? "—" : (r >= 0 ? "+" : "−") + Math.abs(r).toFixed(3));

  function showTip(html, x, y) {
    ttEl.textContent = "";
    ttEl.appendChild(html);
    ttEl.style.opacity = "1";
    ttEl.setAttribute("aria-hidden", "false");
    const r = ttEl.getBoundingClientRect();
    let left = x + 14, top = y - r.height / 2;
    if (left + r.width > window.innerWidth - 8) left = x - r.width - 14;
    top = Math.max(8, Math.min(top, window.innerHeight - r.height - 8));
    ttEl.style.left = left + "px"; ttEl.style.top = top + "px";
  }
  function hideTip() { ttEl.style.opacity = "0"; ttEl.setAttribute("aria-hidden", "true"); }
  function tipNode(head, rows) {
    const frag = document.createDocumentFragment();
    const h = document.createElement("div");
    h.className = "ttHead"; h.textContent = head; frag.appendChild(h);
    for (const r of rows) {
      const d = document.createElement("div"); d.className = "ttRow";
      const k = document.createElement("i"); k.className = "stroke";
      k.style.background = r.color; d.appendChild(k);
      const nm = document.createElement("span"); nm.className = "ttName";
      nm.textContent = r.name; d.appendChild(nm);
      const v = document.createElement("span"); v.className = "ttVal";
      v.textContent = r.value; d.appendChild(v);
      frag.appendChild(d);
    }
    return frag;
  }

  // ---------- legends ----------
  function buildLegends() {
    for (const [host, mark] of [[$("legendBars"), "swatch"]]) {
      host.textContent = "";
      for (const s of SERIES) {
        const item = document.createElement("span"); item.className = "item";
        const sw = document.createElement("i"); sw.className = mark;
        sw.style.background = colorOf(s); item.appendChild(sw);
        const nm = document.createElement("span"); nm.textContent = s.name; item.appendChild(nm);
        const tg = document.createElement("span"); tg.className = "tag"; tg.textContent = s.note;
        item.appendChild(tg);
        host.appendChild(item);
      }
    }
  }

  // ---------- per-signal panels ----------
  // One panel per signal: the headline is the number, the bar is only its scale.
  // Two signed bars per panel — solid = cumulative (cum), outlined = instantaneous (ins) —
  // sharing a zero baseline so sign reads instantly.
  let panelsBuilt = false;
  const panelSvgs = {}, panelCum = {};

  function buildPanels() {
    const host = $("panels"); host.textContent = "";
    for (const s of SERIES) {
      const p = document.createElement("div"); p.className = "panel";
      const nm = document.createElement("div"); nm.className = "pName";
      const sw = document.createElement("i"); sw.className = "swatch";
      sw.style.background = colorOf(s); nm.appendChild(sw);
      nm.appendChild(document.createTextNode(s.name));
      const tg = document.createElement("span"); tg.className = "pTag"; tg.textContent = s.note;
      nm.appendChild(tg);
      p.appendChild(nm);

      const nums = document.createElement("div"); nums.className = "pNums";
      const c = document.createElement("span"); c.className = "pCum"; c.textContent = "—";
      nums.appendChild(c); p.appendChild(nums);
      panelCum[s.key] = c;

      const svg = document.createElementNS(NS, "svg");
      svg.setAttribute("role", "img");
      svg.setAttribute("aria-label", `correlation of ${s.name} with true error`);
      p.appendChild(svg); panelSvgs[s.key] = svg;
      host.appendChild(p);
    }

    panelsBuilt = true;
  }

  function drawPanel(s) {
    const svg = panelSvgs[s.key];
    const W = svg.clientWidth || 130, H = 84;
    const padT = 6, padB = 12;
    svg.setAttribute("viewBox", `0 0 ${W} ${H}`);
    svg.setAttribute("height", H);
    svg.textContent = "";
    const plotH = H - padT - padB;
    const yZero = padT + plotH / 2;
    const yAt = (r) => yZero - (plotH / 2) * Math.max(-1, Math.min(1, r));

    for (const g of [1, 0.5, -0.5, -1]) {
      el("line", { x1: 0, x2: W, y1: yAt(g), y2: yAt(g),
                   stroke: cssVar("--grid"), "stroke-width": 1 }, svg);
    }
    el("line", { x1: 0, x2: W, y1: yZero, y2: yZero,
                 stroke: cssVar("--axis"), "stroke-width": 1 }, svg);

    const rc = cumR(s.key, H1);
    panelCum[s.key].textContent = fmt(rc);
    if (rc == null) {
      txt(svg, "n<3", { x: W / 2, y: yZero - 4, "text-anchor": "middle", class: "hint" });
      return;
    }

    const barW = Math.min(22, W * 0.26), gap = 2;   // <=24px thick, 2px surface gap
    const cx = W / 2;
    const draw = (r, x) => {
      if (r == null) return;
      const y = yAt(r), top = Math.min(y, yZero), h = Math.max(Math.abs(y - yZero), 2);
      const rad = Math.min(4, h / 2, barW / 2);      // rounded data-end, square at baseline
      const neg = r < 0;
      const d = neg
        ? `M${x},${yZero} h${barW} v${h - rad} a${rad},${rad} 0 0 1 -${rad},${rad} h-${barW - 2 * rad} a${rad},${rad} 0 0 1 -${rad},-${rad} z`
        : `M${x},${yZero} h${barW} v-${h - rad} a${rad},${rad} 0 0 0 -${rad},-${rad} h-${barW - 2 * rad} a${rad},${rad} 0 0 0 -${rad},${rad} z`;
      el("path", { d, fill: colorOf(s), opacity: 0.95 }, svg);
    };
    draw(rc, cx - barW / 2);

    const hit = el("rect", { x: 0, y: 0, width: W, height: H, fill: "transparent", tabindex: "0" }, svg);
    const tip = () => tipNode(`${s.name} · H=${H1}`, [
      { color: colorOf(s), name: "cumulative", value: fmt(rc) },
    ]);
    hit.addEventListener("pointermove", (e) => showTip(tip(), e.clientX, e.clientY));
    hit.addEventListener("pointerleave", hideTip);
    hit.addEventListener("focus", () => {
      const b = hit.getBoundingClientRect();
      showTip(tip(), b.right, b.top + b.height / 2);
    });
    hit.addEventListener("blur", hideTip);
  }

  function drawBars() {
    if (!panelsBuilt) buildPanels();
    for (const s of SERIES) {
      drawPanel(s);
    }
    $("h1Lbl").textContent = String(H1);
    $("tH1Lbl").textContent = String(H1);
    $("tH2Lbl").textContent = String(HMAX);
  }

  // ---------- table view (the relief path; every value reachable without hover) ----------
  function drawTable() {
    const body = $("tvBody");
    body.textContent = "";
    for (const s of SERIES) {
      const tr = document.createElement("tr");
      const td0 = document.createElement("td"); td0.className = "k";
      const sw = document.createElement("i"); sw.className = "swatch";
      sw.style.background = colorOf(s); td0.appendChild(sw);
      td0.appendChild(document.createTextNode(s.name));
      tr.appendChild(td0);
      for (const h of [H1, HMAX]) {
        const td = document.createElement("td");
        td.textContent = fmt(cumR(s.key, h));
        tr.appendChild(td);
      }
      body.appendChild(tr);
    }
    document.querySelectorAll("#tv thead th")[1].textContent = `r @H=${H1}`;
    document.querySelectorAll("#tv thead th")[2].textContent = `r @H=${HMAX}`;
  }

  function redraw() {
    drawBars(); drawTable();
    barFootEl.textContent = samples.length < 3
      ? `Waiting for rollout samples — ${samples.length} so far, 3 needed.`
      : (NSAMP > 0 && NSAMP < samples.length)
        ? `${samples.length} rollout samples · scoring the most recent ${NSAMP}`
        : `${samples.length} rollout samples · scoring all of them`;
  }

  // ---------- transport ----------
  let ws = null, pendingTask = null;
  const down = new Set();
  const CAPTURE = ["ArrowUp","ArrowDown","ArrowLeft","ArrowRight","w","W","a","A","s","S","d","D","Space","r","R","q","Q","Escape"];
  const keyName = (e) => (e.key === " " ? "Space" : e.key);
  function send(o) { if (ws && ws.readyState === WebSocket.OPEN) ws.send(JSON.stringify(o)); }
  function releaseAll() { for (const k of Array.from(down)) send({ type: "keyup", key: k }); down.clear(); }
  function setLed(cls, label) { ledEl.className = "led " + cls; connEl.textContent = label; }

  function clearHist() { samples.length = 0; lastStep = -1; redraw(); }

  function num(v) { return (typeof v === "number" && Number.isFinite(v)) ? v : NaN; }

  function onStatus(msg) {
    if (typeof msg.step === "number") {
      if (msg.step < lastStep) { samples.length = 0; }
      lastStep = msg.step;
      $("tStep").textContent = String(msg.step);
    }
    // The server streams `wav_max_horizon` steps; the slider may not exceed it.
    if (typeof msg.wav_max_horizon === "number" && msg.wav_max_horizon !== HMAX) {
      HMAX = msg.wav_max_horizon;
      hRangeEl.max = String(HMAX);
      if (H1 > HMAX) { H1 = HMAX; hRangeEl.value = String(H1); hValEl.textContent = String(H1); }
    }
    if (typeof msg.text === "string") statusTextEl.textContent = msg.text;

    const set = (id, v) => { if (Number.isFinite(num(v))) $(id).textContent = num(v).toFixed(3); };
    set("tErr", msg.true_error); set("tWav", msg.wav);
    set("tUr", msg.u_r); set("tUf", msg.u_f); set("tUs", msg.u_s);

    // A sample is the pair of per-step rollout distance arrays. Storing them
    // whole (rather than a mean at one horizon) is what lets the horizon slider
    // rescore history instead of restarting it.
    const wav = msg.wav_steps, err = msg.err_steps;
    if (!Array.isArray(wav) || !Array.isArray(err) || !wav.length || wav.length !== err.length) return;
    samples.push({ step: (typeof msg.step === "number") ? msg.step : samples.length,
                   u_r: num(msg.u_r), u_f: num(msg.u_f), u_s: num(msg.u_s),
                   wav_steps: wav, err_steps: err });
    while (samples.length > MAX_POINTS) samples.shift();

    const f3 = (v) => (Number.isFinite(v) ? v.toFixed(3) : "—");
    curH1El.textContent = `${f3(prefixMean(wav, H1))}/${f3(prefixMean(err, H1))}`;
    curH2El.textContent = `${f3(prefixMean(wav, HMAX))}/${f3(prefixMean(err, HMAX))}`;
    redraw();

    const t = (typeof msg.task === "string") ? msg.task : null;
    if (pendingTask && t === pendingTask) pendingTask = null;
    if (t && !pendingTask && taskSelectEl.value !== t) taskSelectEl.value = t;
  }

  function connect() {
    pendingTask = null;
    setLed("connecting", "connecting…");
    const proto = location.protocol === "https:" ? "wss" : "ws";
    ws = new WebSocket(`${proto}://${location.host}/ws`);
    ws.binaryType = "arraybuffer";
    ws.onopen = () => setLed("live", "connected");
    ws.onclose = () => { releaseAll(); setLed("", "disconnected"); };
    ws.onerror = () => setLed("", "connection error");
    ws.onmessage = (ev) => {
      if (typeof ev.data === "string") {
        let m;
        try { m = JSON.parse(ev.data); } catch (e) { return; }   // malformed frame: skip
        if (m && m.type === "status") {
          try {
            onStatus(m);
          } catch (e) {
            // A bug in the render path used to be swallowed here, so the panels
            // sat frozen while data kept arriving — indistinguishable from a
            // stalled feed. Surface it instead of hiding it.
            console.error("onStatus failed:", e);
            if (!uiError) {
              uiError = true;
              statusTextEl.textContent = `UI error (see console): ${e.message}`;
            }
          }
        }
        return;
      }
      const url = URL.createObjectURL(new Blob([ev.data], { type: "image/jpeg" }));
      const img = $("frame");
      img.onload = () => { if (img.dataset.last) URL.revokeObjectURL(img.dataset.last); img.dataset.last = url; };
      img.src = url;
    };
  }

  // ---------- controls ----------
  for (const t of TASK_SET) {
    const o = document.createElement("option"); o.value = t; o.textContent = t;
    taskSelectEl.appendChild(o);
  }
  taskSelectEl.value = INITIAL_TASK;
  taskSelectEl.addEventListener("change", () => {
    pendingTask = taskSelectEl.value;
    send({ type: "set_task", task: pendingTask });
    clearHist();
  });

  window.addEventListener("keydown", (e) => {
    const k = keyName(e);
    if (!CAPTURE.includes(k)) return;
    e.preventDefault();
    if (k === "Space") return send({ type: "toggle_pause" });
    if (k === "r" || k === "R") { send({ type: "reset" }); return clearHist(); }
    if (k === "q" || k === "Q" || k === "Escape") return send({ type: "disconnect" });
    if (!down.has(k)) { down.add(k); send({ type: "keydown", key: k }); }
  }, { passive: false });
  window.addEventListener("keyup", (e) => {
    const k = keyName(e);
    if (!CAPTURE.includes(k)) return;
    e.preventDefault();
    if (["Space","r","R","q","Q","Escape"].includes(k)) return;
    if (down.has(k)) { down.delete(k); send({ type: "keyup", key: k }); }
  }, { passive: false });
  window.addEventListener("blur", releaseAll);

  $("stage").addEventListener("pointerdown", () => send({ type: "toggle_pause" }));
  $("btnReset").onclick = () => { send({ type: "reset" }); clearHist(); };
  $("btnClear").onclick = clearHist;
  $("btnReconnect").onclick = connect;
  $("btnTable").onclick = (e) => {
    showTable = !showTable;
    $("tableWrap").style.display = showTable ? "" : "none";
    e.currentTarget.setAttribute("aria-pressed", String(showTable));
  };
  const nsRangeEl = $("nsRange"), nsValEl = $("nsVal"), nsLblEl = $("nsLbl");
  nsRangeEl.oninput = () => {
    const v = parseInt(nsRangeEl.value, 10);
    NSAMP = (v >= parseInt(nsRangeEl.max, 10)) ? 0 : v;   // far right = all
    const label = NSAMP === 0 ? "all" : String(NSAMP);
    nsValEl.textContent = label;
    nsLblEl.textContent = label;
    redraw();          // rescored from samples already held
  };
  hRangeEl.oninput = () => {
    H1 = parseInt(hRangeEl.value, 10);
    hValEl.textContent = String(H1);
    $("h1Lbl").textContent = String(H1);
    redraw();          // prefix means over samples already held — no refetch
  };

  $("btnTheme").onclick = () => {
    const dark = document.documentElement.getAttribute("data-theme") === "dark"
      || (!document.documentElement.hasAttribute("data-theme")
          && matchMedia("(prefers-color-scheme: dark)").matches);
    document.documentElement.setAttribute("data-theme", dark ? "light" : "dark");
    panelsBuilt = false;          // swatches carry inline colours; rebuild them
    buildLegends(); redraw();
  };

  console.log("page build __BUILD__");
  buildLegends();
  redraw();
  connect();
  window.addEventListener("resize", redraw);
})();
</script>
</body>
</html>