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fix: benchmark Flare loading and broken SmolLM2 GGUF URLs #308

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Merged
sauravpanda merged 1 commit into from
Apr 17, 2026
Merged

fix: benchmark Flare loading and broken SmolLM2 GGUF URLs #308

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66 changes: 53 additions & 13 deletions examples/benchmark/index.html
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -370,7 +370,7 @@ <h2>Comparison Charts</h2>
},
flare: {
id: 'smollm2-135m-flare',
url: 'https://huggingface.co/HuggingFaceTB/smollm2-135M-instruct-GGUF/resolve/main/smollm2-135m-instruct-q8_0.gguf',
url: 'https://huggingface.co/bartowski/SmolLM2-135M-Instruct-GGUF/resolve/main/SmolLM2-135M-Instruct-Q8_0.gguf',
},
},
'llama-3.2-1b': {
Expand Down Expand Up @@ -520,7 +520,7 @@ <h2>Comparison Charts</h2>
async function runTransformersInference(prompt, opts) {
const t0 = performance.now();
let firstTokenTime = null;
let outputTokenCount = 0;
let prevTokenCount = 0;

const messages = [{ role: 'user', content: prompt }];
let input;
Expand All @@ -533,33 +533,44 @@ <h2>Comparison Charts</h2>
input = prompt;
}

const inputTokens = transformersPipeline.tokenizer(input);
const inputLen = inputTokens?.input_ids?.dims?.[1] || input.length / 4;

const result = await transformersPipeline(input, {
max_new_tokens: opts.maxTokens,
temperature: opts.temperature || 0.001,
do_sample: opts.temperature > 0,
callback_function: (beams) => {
const generated = beams?.[0]?.output_token_ids?.length || 0;
if (firstTokenTime === null && generated > inputLen) {
callback_function: (output) => {
// output can be [{generated_text}] or beams with output_token_ids
const ids = output?.[0]?.output_token_ids;
const currentLen = ids?.length || ids?.size || 0;
if (firstTokenTime === null && currentLen > prevTokenCount) {
firstTokenTime = performance.now() - t0;
}
outputTokenCount = Math.max(0, generated - inputLen);
if (currentLen > 0) prevTokenCount = currentLen;
},
});

const totalTime = performance.now() - t0;
const output = result[0]?.generated_text || '';
const generatedPart = typeof output === 'string' ? output.slice(input.length) : '';
const decodeTime = totalTime - (firstTokenTime || totalTime);

// Count output tokens by tokenizing the generated part
let outputTokenCount = 0;
try {
const genTokens = transformersPipeline.tokenizer(generatedPart);
outputTokenCount = genTokens?.input_ids?.dims?.[1] || genTokens?.input_ids?.length || 0;
} catch {
// Rough fallback: ~4 chars per token
outputTokenCount = Math.max(1, Math.round(generatedPart.length / 4));
}

// Transformers.js generates all tokens in a single batch call (no true
// streaming), so firstTokenTime ≈ totalTime. Use tokens/totalTime for
// throughput since there's no separate decode phase.
return {
output: generatedPart,
ttft: firstTokenTime || totalTime,
totalTime,
tokenCount: outputTokenCount,
tokensPerSec: (outputTokenCount > 1 && decodeTime > 0) ? ((outputTokenCount - 1) / (decodeTime / 1000)) : 0,
tokensPerSec: outputTokenCount > 0 ? (outputTokenCount / (totalTime / 1000)) : 0,
};
}

Expand All @@ -575,9 +586,38 @@ <h2>Comparison Charts</h2>
if (!flareLib) {
log('Loading @sauravpanda/flare WASM from CDN...', 'info');
const CDN = 'https://cdn.jsdelivr.net/npm/@sauravpanda/flare@0.2.0/pkg';
flareLib = await import(`${CDN}/flare_web.js`);
const wasmUrl = `${CDN}/flare_web_bg.wasm`;

// Fetch the JS module source, patch the WASM URL, and load via blob
// to avoid cross-origin ES module import restrictions.
const jsResp = await fetch(`${CDN}/flare_web.js`, { cache: 'no-cache' });
if (!jsResp.ok) throw new Error(`HTTP ${jsResp.status} fetching flare_web.js`);
let jsSrc = await jsResp.text();
log(`Fetched flare_web.js (${(jsSrc.length / 1024).toFixed(0)} KB)`, 'info');

// Patch import.meta.url references so the WASM file resolves to CDN
jsSrc = jsSrc.replaceAll('import.meta.url', `'${CDN}/flare_web.js'`);

// Fix wasm-pack codegen bug: a JSDoc block contains "/* done */"
// which prematurely closes the outer /** */ comment, causing
// "Unexpected token '*'" parse error. Remove the nested comment.
jsSrc = jsSrc.replaceAll('/* done */', '/* done -/');

const blob = new Blob([jsSrc], { type: 'application/javascript' });
const blobUrl = URL.createObjectURL(blob);
try {
flareLib = await import(/* webpackIgnore: true */ blobUrl);
} catch (importErr) {
URL.revokeObjectURL(blobUrl);
log(`Blob import failed: ${importErr.message}`, 'error');
// Fallback: try direct CDN import
log('Trying direct CDN import...', 'info');
flareLib = await import(`${CDN}/flare_web.js`);
}
URL.revokeObjectURL(blobUrl);

// Initialize the WASM module
await flareLib.default(`${CDN}/flare_web_bg.wasm`);
await flareLib.default(wasmUrl);
log('Flare WASM initialized.', 'success');
}

Expand Down
12 changes: 6 additions & 6 deletions src/config/models/flare-models.json
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,8 +3,8 @@
"engine": "flare",
"modelName": "SmolLM2-135M-Instruct",
"modelType": "text-generation",
"repo": "HuggingFaceTB/smollm2-135M-instruct-GGUF",
"url": "https://huggingface.co/HuggingFaceTB/smollm2-135M-instruct-GGUF/resolve/main/smollm2-135m-instruct-q8_0.gguf",
"repo": "bartowski/SmolLM2-135M-Instruct-GGUF",
"url": "https://huggingface.co/bartowski/SmolLM2-135M-Instruct-GGUF/resolve/main/SmolLM2-135M-Instruct-Q8_0.gguf",
"pipeline": "text-generation",
"defaultQuantization": "Q8_0",
"quantizations": ["Q8_0"],
Expand All @@ -24,8 +24,8 @@
"engine": "flare",
"modelName": "SmolLM2-135M-Instruct-Q4",
"modelType": "text-generation",
"repo": "HuggingFaceTB/smollm2-135M-instruct-GGUF",
"url": "https://huggingface.co/HuggingFaceTB/smollm2-135M-instruct-GGUF/resolve/main/smollm2-135m-instruct-q4_k_m.gguf",
"repo": "bartowski/SmolLM2-135M-Instruct-GGUF",
"url": "https://huggingface.co/bartowski/SmolLM2-135M-Instruct-GGUF/resolve/main/SmolLM2-135M-Instruct-Q4_K_M.gguf",
"pipeline": "text-generation",
"defaultQuantization": "Q4_K_M",
"quantizations": ["Q4_K_M"],
Expand All @@ -45,8 +45,8 @@
"engine": "flare",
"modelName": "SmolLM2-360M-Instruct",
"modelType": "text-generation",
"repo": "HuggingFaceTB/smollm2-360M-instruct-GGUF",
"url": "https://huggingface.co/HuggingFaceTB/smollm2-360M-instruct-GGUF/resolve/main/smollm2-360m-instruct-q8_0.gguf",
"repo": "bartowski/SmolLM2-360M-Instruct-GGUF",
"url": "https://huggingface.co/bartowski/SmolLM2-360M-Instruct-GGUF/resolve/main/SmolLM2-360M-Instruct-Q8_0.gguf",
"pipeline": "text-generation",
"defaultQuantization": "Q8_0",
"quantizations": ["Q8_0"],
Expand Down
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