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Maia3 launch #265

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Merged
BasedBerry merged 3 commits into from
Mar 27, 2026
Merged

Maia3 launch #265

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4c2554e
Fix WDL channel order: model outputs L/D/W not W/D/L
BasedestBerry Mar 27, 2026
0013cc8
Switch to fp16 ONNX model (87MB → 44MB)
BasedestBerry Mar 27, 2026
731ced8
Rename to Maia-3 in download modal
BasedestBerry Mar 27, 2026
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Binary file modified public/maia3/maia3_simplified.onnx
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8 changes: 4 additions & 4 deletions src/components/Common/DownloadModelModal.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ export const DownloadModelModal: React.FC<Props> = ({

<div className="flex flex-col gap-3 text-sm md:text-base">
<p className="text-primary/80">
Our newest model, Maia 3, provides richer and more in-depth
Our newest model, Maia-3, provides richer and more in-depth
analysis, allowing for:
</p>
<ul className="flex list-inside flex-col gap-1.5 pl-2 text-white/80">
Expand All @@ -120,7 +120,7 @@ export const DownloadModelModal: React.FC<Props> = ({
</li>
</ul>
<p className="text-white/80">
Maia 3 runs entirely on your device and requires a one-time 87mb
Maia-3 runs entirely on your device and requires a one-time 44mb
download.
</p>
</div>
Expand Down Expand Up @@ -174,8 +174,8 @@ export const DownloadModelModal: React.FC<Props> = ({
</span>
)}
<p className="font-medium">
{isDownloading ? 'Downloading...' : 'Download Maia 3'}{' '}
<span className="text-xs text-white/70">(87mb)</span>
{isDownloading ? 'Downloading...' : 'Download Maia-3'}{' '}
<span className="text-xs text-white/70">(44mb)</span>
</p>
</div>
</div>
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2 changes: 1 addition & 1 deletion src/contexts/MaiaEngineContext.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ export const MaiaEngineContextProvider: React.FC<{ children: ReactNode }> = ({
model:
process.env.NEXT_PUBLIC_MAIA_MODEL_URL ??
'/maia3/maia3_simplified.onnx',
modelVersion: process.env.NEXT_PUBLIC_MAIA_MODEL_VERSION ?? '2',
modelVersion: process.env.NEXT_PUBLIC_MAIA_MODEL_VERSION ?? '3',
setStatus: setStatus,
setProgress: setProgress,
setError: setError,
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9 changes: 5 additions & 4 deletions src/lib/engine/maia.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -451,12 +451,13 @@ function processOutputsMaia3(
const logits = logits_move.data as Float32Array
const wdl = logits_value.data as Float32Array

// Convert WDL logits to win probability via softmax
// Convert LDW logits to win probability via softmax
// Model output channels: index 0 = Loss, 1 = Draw, 2 = Win (for side-to-move)
const maxWdl = Math.max(wdl[0], wdl[1], wdl[2])
const expW = Math.exp(wdl[0] - maxWdl)
const expL = Math.exp(wdl[0] - maxWdl)
const expD = Math.exp(wdl[1] - maxWdl)
const expL = Math.exp(wdl[2] - maxWdl)
const sumExp = expW + expD + expL
const expW = Math.exp(wdl[2] - maxWdl)
const sumExp = expL + expD + expW
// Win probability = P(win) + 0.5 * P(draw)
let winProb = (expW + 0.5 * expD) / sumExp

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