Stan remote sampling: compile via stan-wasm-wasi, sample via wasm-exec
15 changed files+2698−0
.github/workflows/deploy.ymladded+40−0View file
@@ -0,0 +1,40 @@
1+name: Deploy to GitHub Pages
2+
3+on:
4+ push:
5+ branches: [main]
6+ workflow_dispatch:
7+
8+permissions:
9+ contents: read
10+ pages: write
11+ id-token: write
12+
13+concurrency:
14+ group: pages
15+ cancel-in-progress: true
16+
17+jobs:
18+ build:
19+ runs-on: ubuntu-latest
20+ steps:
21+ - uses: actions/checkout@v4
22+ - uses: actions/setup-node@v4
23+ with:
24+ node-version: 22
25+ cache: npm
26+ - run: npm ci
27+ - run: npm run build
28+ - uses: actions/upload-pages-artifact@v3
29+ with:
30+ path: dist
31+
32+ deploy:
33+ needs: build
34+ runs-on: ubuntu-latest
35+ environment:
36+ name: github-pages
37+ url: ${{ steps.deployment.outputs.page_url }}
38+ steps:
39+ - id: deployment
40+ uses: actions/deploy-pages@v4
.gitignoreadded+5−0View file
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1+node_modules/
2+dist/
3+*.tsbuildinfo
4+# local prototype artifacts (tinystan/oneTBB checkouts, local server state)
5+wasi-prototype/
README.mdadded+48−0View file
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1+# stan-remote-sampling
2+
3+Compile and sample Stan models from the browser, with all computation remote:
4+
5+- **Compile**: the Stan program is sent to
6+ [stan-wasm-wasi](https://stan-wasm-wasi.fly.dev) (a
7+ [stan-playground](https://github.com/flatironinstitute/stan-playground)
8+ compilation server variant), which returns the model compiled as a **pure
9+ WASI command module** — a sandboxed `.wasm` that runs one MCMC chain per
10+ invocation.
11+- **Sample**: each chain is submitted as one job to a
12+ [wasm-exec](https://github.com/magland/wasm-exec) service (default
13+ `https://wasm-exec.fly.dev`), which relays it to attached workers. Progress
14+ streams back live (SSE stderr events → per-chain progress bars); draws
15+ come back as CSV (SSE stdout events) and are merged across chains.
16+
17+Live app: https://concept-collection.github.io/stan-remote-sampling/
18+
19+You need a wasm-exec **client key** (`ck_...`) to sample; it is stored in
20+localStorage.
21+
22+## Notes
23+
24+- Chains share a seed and get distinct chain ids (CmdStan convention), so a
25+ multi-chain run is statistically equivalent to CmdStan's.
26+- First compile after server idle pays a ~30 s machine cold start; compiled
27+ models are cached by program hash, so recompiles are instant.
28+- wasm-exec jobs run with no filesystem and no network, a 256 MiB memory cap,
29+ and a wall-clock timeout. Draw output is bounded by wasm-exec's 10 MiB
30+ per-stream cap.
31+
32+## Development
33+
34+```bash
35+npm install
36+npm run dev # http://localhost:3000
37+```
38+
39+Deployment to GitHub Pages is automatic on push to `main`
40+(`.github/workflows/deploy.yml`).
41+
42+## History
43+
44+Built in stages: (1) in-browser sampling with one web worker per chain via
45+tinystan (since removed — see git history), (2) a prototype proving Stan
46+models compile to pure-WASI modules (now the
47+[stan-wasm-wasi](https://github.com/magland/stan-wasm-wasi) repo), (3) this
48+remote-only app.
index.htmladded+12−0View file
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1+<!doctype html>
2+<html lang="en">
3+ <head>
4+ <meta charset="UTF-8" />
5+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
6+ <title>Stan Remote Sampling</title>
7+ </head>
8+ <body>
9+ <div id="root"></div>
10+ <script type="module" src="/src/main.tsx"></script>
11+ </body>
12+</html>
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1816+ "rollup": "^4.34.9",
1817+ "tinyglobby": "^0.2.13"
1818+ },
1819+ "bin": {
1820+ "vite": "bin/vite.js"
1821+ },
1822+ "engines": {
1823+ "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
1824+ },
1825+ "funding": {
1826+ "url": "https://github.com/vitejs/vite?sponsor=1"
1827+ },
1828+ "optionalDependencies": {
1829+ "fsevents": "~2.3.3"
1830+ },
1831+ "peerDependencies": {
1832+ "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
1833+ "jiti": ">=1.21.0",
1834+ "less": "*",
1835+ "lightningcss": "^1.21.0",
1836+ "sass": "*",
1837+ "sass-embedded": "*",
1838+ "stylus": "*",
1839+ "sugarss": "*",
1840+ "terser": "^5.16.0",
1841+ "tsx": "^4.8.1",
1842+ "yaml": "^2.4.2"
1843+ },
1844+ "peerDependenciesMeta": {
1845+ "@types/node": {
1846+ "optional": true
1847+ },
1848+ "jiti": {
1849+ "optional": true
1850+ },
1851+ "less": {
1852+ "optional": true
1853+ },
1854+ "lightningcss": {
1855+ "optional": true
1856+ },
1857+ "sass": {
1858+ "optional": true
1859+ },
1860+ "sass-embedded": {
1861+ "optional": true
1862+ },
1863+ "stylus": {
1864+ "optional": true
1865+ },
1866+ "sugarss": {
1867+ "optional": true
1868+ },
1869+ "terser": {
1870+ "optional": true
1871+ },
1872+ "tsx": {
1873+ "optional": true
1874+ },
1875+ "yaml": {
1876+ "optional": true
1877+ }
1878+ }
1879+ },
1880+ "node_modules/yallist": {
1881+ "version": "3.1.1",
1882+ "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
1883+ "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
1884+ "dev": true,
1885+ "license": "ISC"
1886+ }
1887+ }
1888+}
package.jsonadded+22−0View file
@@ -0,0 +1,22 @@
1+{
2+ "name": "stan-remote-sampling",
3+ "private": true,
4+ "version": "0.1.0",
5+ "type": "module",
6+ "scripts": {
7+ "dev": "vite",
8+ "build": "tsc -b && vite build",
9+ "preview": "vite preview"
10+ },
11+ "dependencies": {
12+ "react": "^18.3.1",
13+ "react-dom": "^18.3.1"
14+ },
15+ "devDependencies": {
16+ "@types/react": "^18.3.12",
17+ "@types/react-dom": "^18.3.1",
18+ "@vitejs/plugin-react": "^4.3.4",
19+ "typescript": "^5.6.3",
20+ "vite": "^6.0.0"
21+ }
22+}
src/App.tsxadded+339−0View file
@@ -0,0 +1,339 @@
1+import { useCallback, useRef, useState } from "react";
2+import compileStanProgram, {
3+ DEFAULT_WASI_SERVER_URL,
4+} from "./compileStanProgram";
5+import runRemoteChains from "./runRemoteChains";
6+import {
7+ ChainStatusMap,
8+ defaultSamplingOpts,
9+ MultiChainResult,
10+ SamplingOpts,
11+} from "./types";
12+
13+const DEFAULT_STAN_PROGRAM = `data {
14+ int<lower=0> N;
15+ array[N] int<lower=0, upper=1> y;
16+}
17+parameters {
18+ real<lower=0, upper=1> theta;
19+}
20+model {
21+ theta ~ beta(1, 1);
22+ y ~ bernoulli(theta);
23+}
24+`;
25+
26+const DEFAULT_DATA_JSON = `{
27+ "N": 10,
28+ "y": [0, 1, 0, 0, 0, 0, 0, 0, 0, 1]
29+}
30+`;
31+
32+const mean = (xs: number[]) => xs.reduce((a, b) => a + b, 0) / xs.length;
33+const std = (xs: number[]) => {
34+ const m = mean(xs);
35+ return Math.sqrt(mean(xs.map((x) => (x - m) ** 2)));
36+};
37+
38+function App() {
39+ const [stanProgram, setStanProgram] = useState(DEFAULT_STAN_PROGRAM);
40+ const [dataJson, setDataJson] = useState(DEFAULT_DATA_JSON);
41+
42+ const [wasiServerUrl, setWasiServerUrl] = useState(
43+ () => localStorage.getItem("wasiServerUrl") ?? DEFAULT_WASI_SERVER_URL,
44+ );
45+ const [wasmExecUrl, setWasmExecUrl] = useState(
46+ () => localStorage.getItem("wasmExecUrl") ?? "https://wasm-exec.fly.dev",
47+ );
48+ const [wasmExecKey, setWasmExecKey] = useState(
49+ () => localStorage.getItem("wasmExecKey") ?? "",
50+ );
51+
52+ const [compileStatus, setCompileStatus] = useState("");
53+ const [wasiWasmUrl, setWasiWasmUrl] = useState<string | undefined>(undefined);
54+ const [compiling, setCompiling] = useState(false);
55+
56+ const [samplingOpts, setSamplingOpts] =
57+ useState<SamplingOpts>(defaultSamplingOpts);
58+ const [sampling, setSampling] = useState(false);
59+ const [chainStatus, setChainStatus] = useState<ChainStatusMap>({});
60+ const [samplingError, setSamplingError] = useState("");
61+ const [result, setResult] = useState<MultiChainResult | undefined>(undefined);
62+ const cancelRef = useRef<(() => void) | undefined>(undefined);
63+
64+ const handleCompile = useCallback(async () => {
65+ setCompiling(true);
66+ setResult(undefined);
67+ setWasiWasmUrl(undefined);
68+ const { artifactUrl } = await compileStanProgram(
69+ wasiServerUrl,
70+ stanProgram,
71+ setCompileStatus,
72+ );
73+ setWasiWasmUrl(artifactUrl);
74+ setCompiling(false);
75+ }, [wasiServerUrl, stanProgram]);
76+
77+ const handleSample = useCallback(async () => {
78+ if (!wasiWasmUrl) return;
79+ setSampling(true);
80+ setSamplingError("");
81+ setResult(undefined);
82+ setChainStatus({});
83+
84+ try {
85+ // fetch the compiled WASI module from the compile server (browser
86+ // HTTP cache makes repeat samples cheap)
87+ const resp = await fetch(wasiWasmUrl);
88+ if (!resp.ok)
89+ throw new Error(`failed to fetch ${wasiWasmUrl}: ${resp.statusText}`);
90+ const moduleBytes = new Uint8Array(await resp.arrayBuffer());
91+
92+ const run = runRemoteChains(
93+ wasmExecUrl,
94+ wasmExecKey,
95+ moduleBytes,
96+ dataJson,
97+ samplingOpts,
98+ (chainId, status) =>
99+ setChainStatus((prev) => ({ ...prev, [chainId]: status })),
100+ );
101+ cancelRef.current = run.cancel;
102+ setResult(await run.result);
103+ } catch (e) {
104+ setSamplingError(`${e}`);
105+ } finally {
106+ cancelRef.current = undefined;
107+ setSampling(false);
108+ }
109+ }, [wasiWasmUrl, wasmExecUrl, wasmExecKey, dataJson, samplingOpts]);
110+
111+ const handleCancel = useCallback(() => {
112+ cancelRef.current?.();
113+ cancelRef.current = undefined;
114+ setSampling(false);
115+ setSamplingError("canceled");
116+ }, []);
117+
118+ const setOpt = (key: keyof SamplingOpts, value: number) =>
119+ setSamplingOpts((prev) => ({ ...prev, [key]: value }));
120+
121+ return (
122+ <div style={{ fontFamily: "sans-serif", margin: 20, maxWidth: 1100 }}>
123+ <h2>Stan Remote Sampling</h2>
124+ <p style={{ color: "#555", fontSize: 14 }}>
125+ The Stan program is compiled to a pure-WASI module by{" "}
126+ <code>stan-wasm-wasi</code>; sampling runs one chain per parallel job
127+ on <code>wasm-exec</code> workers.
128+ </p>
129+
130+ <div style={{ display: "flex", gap: 20 }}>
131+ <div style={{ flex: 2 }}>
132+ <h3>Stan program</h3>
133+ <textarea
134+ value={stanProgram}
135+ onChange={(e) => setStanProgram(e.target.value)}
136+ rows={16}
137+ style={{ width: "100%", fontFamily: "monospace" }}
138+ spellCheck={false}
139+ />
140+ </div>
141+ <div style={{ flex: 1 }}>
142+ <h3>data.json</h3>
143+ <textarea
144+ value={dataJson}
145+ onChange={(e) => setDataJson(e.target.value)}
146+ rows={16}
147+ style={{ width: "100%", fontFamily: "monospace" }}
148+ spellCheck={false}
149+ />
150+ </div>
151+ </div>
152+
153+ <h3>Compile</h3>
154+ <div style={{ display: "flex", gap: 10, alignItems: "center", flexWrap: "wrap" }}>
155+ <label>
156+ Compile server:{" "}
157+ <input
158+ value={wasiServerUrl}
159+ onChange={(e) => {
160+ setWasiServerUrl(e.target.value);
161+ localStorage.setItem("wasiServerUrl", e.target.value);
162+ }}
163+ style={{ width: 280 }}
164+ />
165+ </label>
166+ <button onClick={handleCompile} disabled={compiling || sampling}>
167+ Compile
168+ </button>
169+ <span>{compileStatus}</span>
170+ </div>
171+
172+ <h3>Sample</h3>
173+ <div
174+ style={{
175+ display: "flex",
176+ gap: 15,
177+ alignItems: "center",
178+ flexWrap: "wrap",
179+ fontSize: 14,
180+ marginBottom: 10,
181+ }}
182+ >
183+ <label>
184+ wasm-exec server:{" "}
185+ <input
186+ value={wasmExecUrl}
187+ onChange={(e) => {
188+ setWasmExecUrl(e.target.value);
189+ localStorage.setItem("wasmExecUrl", e.target.value);
190+ }}
191+ style={{ width: 200 }}
192+ />
193+ </label>
194+ <label>
195+ Client key (ck_...):{" "}
196+ <input
197+ value={wasmExecKey}
198+ onChange={(e) => {
199+ setWasmExecKey(e.target.value);
200+ localStorage.setItem("wasmExecKey", e.target.value);
201+ }}
202+ style={{ width: 220 }}
203+ />
204+ </label>
205+ </div>
206+
207+ <div style={{ display: "flex", gap: 15, alignItems: "center", flexWrap: "wrap" }}>
208+ <label>
209+ Chains (parallel jobs):{" "}
210+ <input
211+ type="number"
212+ min={1}
213+ max={16}
214+ value={samplingOpts.num_chains}
215+ onChange={(e) => setOpt("num_chains", parseInt(e.target.value) || 1)}
216+ style={{ width: 60 }}
217+ />
218+ </label>
219+ <label>
220+ Warmup:{" "}
221+ <input
222+ type="number"
223+ min={0}
224+ value={samplingOpts.num_warmup}
225+ onChange={(e) => setOpt("num_warmup", parseInt(e.target.value) || 0)}
226+ style={{ width: 80 }}
227+ />
228+ </label>
229+ <label>
230+ Samples:{" "}
231+ <input
232+ type="number"
233+ min={1}
234+ value={samplingOpts.num_samples}
235+ onChange={(e) => setOpt("num_samples", parseInt(e.target.value) || 1)}
236+ style={{ width: 80 }}
237+ />
238+ </label>
239+ <button
240+ onClick={handleSample}
241+ disabled={sampling || compiling || !wasiWasmUrl || !wasmExecKey}
242+ >
243+ Sample
244+ </button>
245+ {sampling && <button onClick={handleCancel}>Cancel</button>}
246+ </div>
247+
248+ {Object.keys(chainStatus).length > 0 && (
249+ <div style={{ marginTop: 15 }}>
250+ {Array.from({ length: samplingOpts.num_chains }, (_, i) => i + 1).map(
251+ (chainId) => {
252+ const s = chainStatus[chainId];
253+ let text = "submitted / queued...";
254+ let pct = 0;
255+ if (s === "done") {
256+ text = "done";
257+ pct = 100;
258+ } else if (s === "error") {
259+ text = "error";
260+ } else if (s) {
261+ pct = Math.round((s.iteration / s.totalIterations) * 100);
262+ text = `${s.iteration} / ${s.totalIterations} ${s.warmup ? "(warmup)" : "(sampling)"}`;
263+ }
264+ return (
265+ <div
266+ key={chainId}
267+ style={{ display: "flex", alignItems: "center", gap: 10, marginBottom: 4 }}
268+ >
269+ <span style={{ width: 70 }}>Chain {chainId}</span>
270+ <div style={{ width: 300, height: 14, background: "#eee", border: "1px solid #ccc" }}>
271+ <div
272+ style={{
273+ width: `${pct}%`,
274+ height: "100%",
275+ background: s === "error" ? "#c33" : "#4a90d9",
276+ }}
277+ />
278+ </div>
279+ <span style={{ fontSize: 13, color: "#555" }}>{text}</span>
280+ </div>
281+ );
282+ },
283+ )}
284+ </div>
285+ )}
286+
287+ {samplingError && (
288+ <pre style={{ color: "#c33", whiteSpace: "pre-wrap" }}>{samplingError}</pre>
289+ )}
290+
291+ {result && (
292+ <div style={{ marginTop: 15 }}>
293+ <h3>Results</h3>
294+ <p style={{ fontSize: 14 }}>
295+ {result.numChains} chains, {result.draws[0]?.length ?? 0} total draws,{" "}
296+ {result.computeTimeSec.toFixed(2)} sec
297+ </p>
298+ <table style={{ borderCollapse: "collapse" }}>
299+ <thead>
300+ <tr>
301+ {["parameter", "mean", "std"].map((h) => (
302+ <th
303+ key={h}
304+ style={{ border: "1px solid #ccc", padding: "4px 12px", textAlign: "left" }}
305+ >
306+ {h}
307+ </th>
308+ ))}
309+ </tr>
310+ </thead>
311+ <tbody>
312+ {result.paramNames.map((name, p) => (
313+ <tr key={name}>
314+ <td style={{ border: "1px solid #ccc", padding: "4px 12px" }}>{name}</td>
315+ <td style={{ border: "1px solid #ccc", padding: "4px 12px" }}>
316+ {mean(result.draws[p]).toFixed(4)}
317+ </td>
318+ <td style={{ border: "1px solid #ccc", padding: "4px 12px" }}>
319+ {std(result.draws[p]).toFixed(4)}
320+ </td>
321+ </tr>
322+ ))}
323+ </tbody>
324+ </table>
325+ {result.consoleText.trim() && (
326+ <details style={{ marginTop: 10 }}>
327+ <summary>Console output</summary>
328+ <pre style={{ fontSize: 12, background: "#f6f6f6", padding: 10 }}>
329+ {result.consoleText}
330+ </pre>
331+ </details>
332+ )}
333+ </div>
334+ )}
335+ </div>
336+ );
337+}
338+
339+export default App;
src/compileStanProgram.tsadded+59−0View file
@@ -0,0 +1,59 @@
1+// Same compilation mechanism as stan-playground: POST the program to the
2+// compilation server, then download the compiled artifact. The server
3+// (stan-wasm-wasi) produces a pure-WASI command module at
4+// /download/{model_id}/main.wasm, runnable on wasm-exec workers.
5+
6+export const DEFAULT_WASI_SERVER_URL = "https://stan-wasm-wasi.fly.dev";
7+
8+const compileStanProgram = async (
9+ serverUrl: string,
10+ stanProgram: string,
11+ onStatus: (s: string) => void,
12+): Promise<{ artifactUrl?: string }> => {
13+ try {
14+ onStatus("compiling...");
15+
16+ const compileURL = `${serverUrl}/compile`;
17+ const runCompile = await fetch(compileURL, {
18+ method: "POST",
19+ headers: {
20+ "Content-Type": "text/plain",
21+ Authorization: "Bearer 1234",
22+ },
23+ body: stanProgram,
24+ });
25+ if (!runCompile.ok) {
26+ onStatus(`failed to compile: ${await messageOrStatus(runCompile)}`);
27+ return {};
28+ }
29+ const compileResp = await runCompile.json();
30+ const artifactUrl = `${serverUrl}/download/${compileResp.model_id}/main.wasm`;
31+
32+ // download to make sure it is there
33+ onStatus("checking download of main.wasm");
34+ const downloadCheck = await fetch(artifactUrl, { method: "HEAD" });
35+ if (!downloadCheck.ok) {
36+ onStatus(
37+ `failed to download main.wasm: ${await messageOrStatus(downloadCheck)}`,
38+ );
39+ return {};
40+ }
41+
42+ onStatus("compiled");
43+ return { artifactUrl };
44+ } catch (e) {
45+ onStatus(`failed to compile: ${e}`);
46+ return {};
47+ }
48+};
49+
50+const messageOrStatus = async (response: Response) => {
51+ try {
52+ const j = await response.json();
53+ return j?.message ?? response.statusText;
54+ } catch {
55+ return response.statusText;
56+ }
57+};
58+
59+export default compileStanProgram;
src/main.tsxadded+9−0View file
@@ -0,0 +1,9 @@
1+import { StrictMode } from "react";
2+import { createRoot } from "react-dom/client";
3+import App from "./App";
4+
5+createRoot(document.getElementById("root")!).render(
6+ <StrictMode>
7+ <App />
8+ </StrictMode>,
9+);
src/mergeChains.tsadded+20−0View file
@@ -0,0 +1,20 @@
1+import type { ChainResult, MultiChainResult } from "./types";
2+
3+export const mergeChainResults = (
4+ chainResults: ChainResult[],
5+ computeTimeSec: number,
6+): MultiChainResult => {
7+ const sorted = [...chainResults].sort((a, b) => a.chainId - b.chainId);
8+ const paramNames = sorted[0].paramNames;
9+ // concatenate draws across chains, per parameter
10+ const draws = paramNames.map((_, p) => sorted.flatMap((c) => c.draws[p]));
11+ return {
12+ paramNames,
13+ draws,
14+ numChains: sorted.length,
15+ computeTimeSec,
16+ consoleText: sorted
17+ .map((c) => `--- chain ${c.chainId} ---\n${c.consoleText}`)
18+ .join("\n"),
19+ };
20+};
src/parseProgress.tsadded+14−0View file
@@ -0,0 +1,14 @@
1+import type { ChainProgress } from "./types";
2+
3+// Stan progress lines for a single chain look like:
4+// "Iteration: 800 / 2000 [ 40%] (Warmup)"
5+export const parseProgress = (msg: string): ChainProgress | undefined => {
6+ if (!msg.startsWith("Iteration:")) return undefined;
7+ const cleaned = msg.replace(/\[|\]/g, "");
8+ const parts = cleaned.split(/\s+/);
9+ const iteration = parseInt(parts[1]);
10+ const totalIterations = parseInt(parts[3]);
11+ const warmup = parts[5] === "(Warmup)";
12+ if (isNaN(iteration) || isNaN(totalIterations)) return undefined;
13+ return { iteration, totalIterations, warmup };
14+};
src/runRemoteChains.tsadded+168−0View file
@@ -0,0 +1,168 @@
1+import { mergeChainResults } from "./mergeChains";
2+import { parseProgress } from "./parseProgress";
3+import type {
4+ ChainResult,
5+ ChainStatus,
6+ MultiChainResult,
7+ SamplingOpts,
8+} from "./types";
9+
10+// Runs chains remotely on a wasm-exec service: one POST /v1/execute job per
11+// chain, module = the model compiled as a pure-WASI command module (see
12+// wasi-prototype/). The driver's argv: data_json seed chain_id num_warmup
13+// num_samples init_radius refresh. Progress arrives as SSE stderr events,
14+// draws as CSV on SSE stdout events.
15+
16+type SseEvent = { event: string; data: any };
17+
18+async function* sseEvents(body: ReadableStream<Uint8Array>): AsyncGenerator<SseEvent> {
19+ const reader = body.getReader();
20+ const decoder = new TextDecoder();
21+ let buf = "";
22+ while (true) {
23+ const { done, value } = await reader.read();
24+ if (done) break;
25+ buf += decoder.decode(value, { stream: true });
26+ let sep;
27+ while ((sep = buf.indexOf("\n\n")) !== -1) {
28+ const block = buf.slice(0, sep);
29+ buf = buf.slice(sep + 2);
30+ let event = "message";
31+ let data = "";
32+ for (const line of block.split("\n")) {
33+ if (line.startsWith("event:")) event = line.slice(6).trim();
34+ else if (line.startsWith("data:")) data += line.slice(5).trim();
35+ }
36+ if (data) yield { event, data: JSON.parse(data) };
37+ }
38+ }
39+}
40+
41+const runOneRemoteChain = async (
42+ serverUrl: string,
43+ clientKey: string,
44+ moduleBytes: Uint8Array,
45+ args: string[],
46+ chainId: number,
47+ signal: AbortSignal,
48+ onStatus: (chainId: number, status: ChainStatus) => void,
49+): Promise<ChainResult> => {
50+ const form = new FormData();
51+ // POC: send the module bytes with every job. The server caches by sha256,
52+ // so this could be optimized to module_sha256 with a 404 fallback.
53+ form.append("module", new Blob([moduleBytes as BlobPart]), "main-wasi.wasm");
54+ form.append("args", JSON.stringify(args));
55+ form.append("timeout_ms", "300000");
56+
57+ const resp = await fetch(`${serverUrl}/v1/execute`, {
58+ method: "POST",
59+ headers: { Authorization: `Bearer ${clientKey}` },
60+ body: form,
61+ signal,
62+ });
63+ if (!resp.ok || !resp.body) {
64+ let message = resp.statusText;
65+ try {
66+ message = (await resp.json()).message ?? message;
67+ } catch {
68+ // keep statusText
69+ }
70+ throw new Error(`chain ${chainId}: submit failed: ${message}`);
71+ }
72+
73+ let stdoutText = "";
74+ let stderrText = "";
75+ let stderrLineBuf = "";
76+ let exitCode: number | undefined;
77+
78+ for await (const { event, data } of sseEvents(resp.body)) {
79+ if (event === "stdout") {
80+ stdoutText += atob(data.b64);
81+ } else if (event === "stderr") {
82+ const text = atob(data.b64);
83+ stderrText += text;
84+ stderrLineBuf += text;
85+ let nl;
86+ while ((nl = stderrLineBuf.indexOf("\n")) !== -1) {
87+ const line = stderrLineBuf.slice(0, nl).trim();
88+ stderrLineBuf = stderrLineBuf.slice(nl + 1);
89+ const progress = parseProgress(line);
90+ if (progress) onStatus(chainId, progress);
91+ }
92+ } else if (event === "exit") {
93+ exitCode = data.exitCode;
94+ } else if (event === "error") {
95+ throw new Error(`chain ${chainId}: ${data.code}: ${data.message}`);
96+ }
97+ }
98+
99+ if (exitCode === undefined)
100+ throw new Error(`chain ${chainId}: stream ended without exit event`);
101+ if (exitCode !== 0)
102+ throw new Error(
103+ `chain ${chainId}: module exited with code ${exitCode}\n${stderrText.slice(-1000)}`,
104+ );
105+
106+ // stdout: header line of param names, then one CSV row per draw
107+ const lines = stdoutText.trim().split("\n");
108+ const paramNames = lines[0].split(",");
109+ const rows = lines.slice(1).map((l) => l.split(",").map(Number));
110+ const draws = paramNames.map((_, p) => rows.map((r) => r[p]));
111+ return { chainId, paramNames, draws, consoleText: stderrText };
112+};
113+
114+const runRemoteChains = (
115+ serverUrl: string,
116+ clientKey: string,
117+ moduleBytes: Uint8Array,
118+ data: string,
119+ opts: SamplingOpts,
120+ onChainStatus: (chainId: number, status: ChainStatus) => void,
121+): { result: Promise<MultiChainResult>; cancel: () => void } => {
122+ const seed = opts.seed ?? Math.floor(Math.random() * Math.pow(2, 32));
123+ const refresh = Math.max(
124+ 10,
125+ Math.floor((opts.num_warmup + opts.num_samples) / 100) * 10,
126+ );
127+ const startTimeSec = performance.now() / 1000;
128+ const abort = new AbortController();
129+
130+ const chainPromises = Array.from({ length: opts.num_chains }, (_, i) => {
131+ const chainId = i + 1;
132+ const args = [
133+ data,
134+ String(seed),
135+ String(chainId),
136+ String(opts.num_warmup),
137+ String(opts.num_samples),
138+ String(opts.init_radius),
139+ String(refresh),
140+ ];
141+ return runOneRemoteChain(
142+ serverUrl.replace(/\/$/, ""),
143+ clientKey,
144+ moduleBytes,
145+ args,
146+ chainId,
147+ abort.signal,
148+ onChainStatus,
149+ ).then(
150+ (r) => {
151+ onChainStatus(chainId, "done");
152+ return r;
153+ },
154+ (e) => {
155+ onChainStatus(chainId, "error");
156+ throw e;
157+ },
158+ );
159+ });
160+
161+ const result = Promise.all(chainPromises).then((chainResults) =>
162+ mergeChainResults(chainResults, performance.now() / 1000 - startTimeSec),
163+ );
164+
165+ return { result, cancel: () => abort.abort() };
166+};
167+
168+export default runRemoteChains;
src/types.tsadded+43−0View file
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1+export type SamplingOpts = {
2+ num_chains: number;
3+ num_warmup: number;
4+ num_samples: number;
5+ init_radius: number;
6+ seed: number | undefined;
7+};
8+
9+export const defaultSamplingOpts: SamplingOpts = {
10+ num_chains: 4,
11+ num_warmup: 1000,
12+ num_samples: 1000,
13+ init_radius: 2.0,
14+ seed: undefined,
15+};
16+
17+export type ChainProgress = {
18+ iteration: number;
19+ totalIterations: number;
20+ warmup: boolean;
21+};
22+
23+// Result of one chain (one wasm-exec job)
24+export type ChainResult = {
25+ chainId: number;
26+ paramNames: string[];
27+ draws: number[][]; // draws[paramIndex][drawIndex]
28+ consoleText: string;
29+};
30+
31+export type MultiChainResult = {
32+ paramNames: string[];
33+ draws: number[][]; // draws[paramIndex][drawIndex], chains concatenated
34+ numChains: number;
35+ computeTimeSec: number;
36+ consoleText: string;
37+};
38+
39+export type ChainStatus = ChainProgress | "done" | "error";
40+
41+export type ChainStatusMap = {
42+ [chainId: number]: ChainStatus;
43+};
tsconfig.jsonadded+20−0View file
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1+{
2+ "compilerOptions": {
3+ "target": "ES2020",
4+ "useDefineForClassFields": true,
5+ "lib": ["ES2020", "DOM", "DOM.Iterable", "WebWorker"],
6+ "module": "ESNext",
7+ "skipLibCheck": true,
8+ "moduleResolution": "bundler",
9+ "allowImportingTsExtensions": true,
10+ "isolatedModules": true,
11+ "moduleDetection": "force",
12+ "noEmit": true,
13+ "jsx": "react-jsx",
14+ "strict": true,
15+ "noUnusedLocals": true,
16+ "noUnusedParameters": true,
17+ "noFallthroughCasesInSwitch": true
18+ },
19+ "include": ["src"]
20+}
vite.config.tsadded+11−0View file
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1+import react from "@vitejs/plugin-react";
2+import { defineConfig } from "vite";
3+
4+export default defineConfig(({ command }) => ({
5+ plugins: [react()],
6+ // served at https://concept-collection.github.io/stan-remote-sampling/
7+ base: command === "build" ? "/stan-remote-sampling/" : "/",
8+ server: {
9+ port: 3000,
10+ },
11+}));