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| <text x="80" y="182" font-family="DejaVu Serif, Times New Roman, serif" font-size="21" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="start">Caller A</text> |
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| <text x="80" y="230" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="italic" text-anchor="start">chunks as they arrive</text> |
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| <text x="225.0" y="275.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A2</text> |
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| <text x="267.0" y="275.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A3</text> |
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| <text x="80" y="392" font-family="DejaVu Serif, Times New Roman, serif" font-size="21" fill="#ad5e38" font-weight="bold" font-style="normal" text-anchor="start">Caller B</text> |
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| <text x="80" y="440" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="italic" text-anchor="start">all of it at the end</text> |
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| <text x="225.0" y="485.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#ad5e38" font-weight="bold" font-style="normal" text-anchor="middle">B2</text> |
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| <text x="80" y="602" font-family="DejaVu Serif, Times New Roman, serif" font-size="21" fill="#3d6a8a" font-weight="bold" font-style="normal" text-anchor="start">Caller C</text> |
| <text x="80" y="628" font-family="DejaVu Sans Mono, Menlo, monospace" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">stream(text)</text> |
| <text x="80" y="650" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="italic" text-anchor="start">chunks as they arrive</text> |
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| <text x="183.0" y="695.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#3d6a8a" font-weight="bold" font-style="normal" text-anchor="middle">C1</text> |
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| <text x="435" y="244" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#555" font-weight="normal" font-style="normal" text-anchor="middle">planned together</text> |
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| <text x="540" y="176" font-family="DejaVu Serif, Times New Roman, serif" font-size="20" fill="#1a1a1a" font-weight="bold" font-style="normal" text-anchor="start">Queue 1: sentences waiting for the model</text> |
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| <rect x="604" y="204" width="44" height="42" rx="4" fill="#ffffff" stroke="#cfcfcf" stroke-width="1.2" stroke-dasharray="4 3"/> |
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| <text x="782.0" y="229.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#ad5e38" font-weight="bold" font-style="normal" text-anchor="middle">B2</text> |
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| <text x="886.0" y="229.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A3</text> |
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| <text x="990.0" y="229.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A1</text> |
| <text x="548" y="274" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#888" font-weight="normal" font-style="normal" text-anchor="start">back</text> |
| <text x="1008" y="190" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">front</text> |
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| <text x="881" y="292" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="middle">one batch: up to B from the front</text> |
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| <text x="1181" y="150" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="normal" text-anchor="middle">GPU, used only by the Playhead loop</text> |
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| <text x="1181" y="216" font-family="DejaVu Serif, Times New Roman, serif" font-size="22" fill="#1a1a1a" font-weight="bold" font-style="normal" text-anchor="middle">Think</text> |
| <text x="1181" y="240" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="normal" text-anchor="middle">aligner and four steps</text> |
| <text x="1181" y="259" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="normal" text-anchor="middle">one pass for the batch</text> |
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| <text x="1181" y="483" font-family="DejaVu Serif, Times New Roman, serif" font-size="22" fill="#1a1a1a" font-weight="bold" font-style="normal" text-anchor="middle">Decode</text> |
| <text x="1181" y="507" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="normal" text-anchor="middle">windows to 48 kHz audio</text> |
| <text x="1181" y="526" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="normal" text-anchor="middle">one pass for the batch</text> |
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| <text x="800" y="362" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="middle">each sentence it thinks adds its windows at the back</text> |
| <text x="540" y="446" font-family="DejaVu Serif, Times New Roman, serif" font-size="20" fill="#1a1a1a" font-weight="bold" font-style="normal" text-anchor="start">Queue 2: windows waiting for the decoder</text> |
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| <text x="989.0" y="499.32" font-family="DejaVu Sans, Arial, sans-serif" font-size="12" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A1</text> |
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| <text x="877.0" y="499.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A1</text> |
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| <text x="813.0" y="499.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A2</text> |
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| <text x="765.0" y="499.32" font-family="DejaVu Sans, Arial, sans-serif" font-size="12" fill="#4f7a43" font-weight="bold" font-style="normal" text-anchor="middle">A2</text> |
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| <text x="717.0" y="499.68" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#ad5e38" font-weight="bold" font-style="normal" text-anchor="middle">B1</text> |
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| <text x="669.0" y="499.32" font-family="DejaVu Sans, Arial, sans-serif" font-size="12" fill="#ad5e38" font-weight="bold" font-style="normal" text-anchor="middle">B1</text> |
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| <text x="637.0" y="499.32" font-family="DejaVu Sans, Arial, sans-serif" font-size="12" fill="#3d6a8a" font-weight="bold" font-style="normal" text-anchor="middle">C1</text> |
| <text x="548" y="544" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#888" font-weight="normal" font-style="normal" text-anchor="start">back</text> |
| <text x="1008" y="460" font-family="DejaVu Sans, Arial, sans-serif" font-size="13" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">front</text> |
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| <text x="857" y="562" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="middle">one batch: up to B from the front</text> |
| <text x="857" y="581" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#555" font-weight="normal" font-style="normal" text-anchor="middle">on a GPU, one window size per batch</text> |
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| <text x="540" y="640" font-family="DejaVu Sans, Arial, sans-serif" font-size="15" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">First come, first served: nothing overtakes,</text> |
| <text x="540" y="664" font-family="DejaVu Sans, Arial, sans-serif" font-size="15" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">and whatever does not fit waits at the front.</text> |
| <text x="540" y="688" font-family="DejaVu Sans, Arial, sans-serif" font-size="15" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">A caller who hangs up leaves both queues.</text> |
| <text x="540" y="712" font-family="DejaVu Sans, Arial, sans-serif" font-size="15" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">A batch that fails, fails only its own callers.</text> |
| <text x="540" y="736" font-family="DejaVu Sans, Arial, sans-serif" font-size="15" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">Narrow windows: a stream's first second, or a tail.</text> |
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| <text x="640" y="790" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="middle">each window goes to its own caller's outbox, in order, with the sentence's pause after its last window</text> |
| <text x="690" y="880" font-family="DejaVu Serif, Times New Roman, serif" font-size="20" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="middle">(a) Callers, the two queues and the GPU</text> |
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| <text x="1380" y="180" font-family="DejaVu Serif, Times New Roman, serif" font-size="19" fill="#1a1a1a"><tspan font-weight="bold">Algorithm 1</tspan><tspan dx="14">One Playhead turn</tspan></text> |
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| <text x="1418" y="228" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="italic" text-anchor="start">B = best_batch_size(); Q1, Q2: first come, first served</text> |
| <text x="1406" y="258" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">1:</text> |
| <text x="1418" y="258" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">new ← every call waiting in the inbox</text> |
| <text x="1406" y="288" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">2:</text> |
| <text x="1418" y="288" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">plan new in one batch, so each sentence's</text> |
| <text x="1418" y="318" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">length and windows are known</text> |
| <text x="1406" y="348" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">3:</text> |
| <text x="1418" y="348" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">add each new call's sentences to the back of Q1</text> |
| <text x="1406" y="378" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">4:</text> |
| <text x="1418" y="378" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">remove entries of callers that hung up or failed</text> |
| <text x="1406" y="408" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">5:</text> |
| <text x="1418" y="408" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">S ← up to B sentences from the front of Q1</text> |
| <text x="1406" y="438" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">6:</text> |
| <text x="1418" y="438" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">think(S); add each sentence's windows to the</text> |
| <text x="1418" y="468" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">back of Q2</text> |
| <text x="1406" y="498" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">7:</text> |
| <text x="1418" y="498" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">W ← up to B windows from the front of Q2;</text> |
| <text x="1418" y="528" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">on a GPU, stop at a window of another size</text> |
| <text x="1406" y="558" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">8:</text> |
| <text x="1418" y="558" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">decode(W); send each window to its caller's outbox</text> |
| <text x="1406" y="588" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">9:</text> |
| <text x="1418" y="588" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">after a sentence's last window, send its pause</text> |
| <text x="1406" y="618" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">10:</text> |
| <text x="1418" y="618" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">when a caller has nothing left, send DONE</text> |
| <text x="1406" y="648" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#888" font-weight="normal" font-style="normal" text-anchor="end">11:</text> |
| <text x="1418" y="648" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">if the inbox, Q1 and Q2 are empty, sleep until</text> |
| <text x="1418" y="678" font-family="DejaVu Sans, Arial, sans-serif" font-size="16" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="start">a call arrives; otherwise start the next turn</text> |
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| <text x="1380" y="730" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">A failing step sends its error to the callers in its</text> |
| <text x="1380" y="754" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">batch only. Callers read their own outbox: stream()</text> |
| <text x="1380" y="778" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">yields each window as it arrives; say() returns after</text> |
| <text x="1380" y="802" font-family="DejaVu Sans, Arial, sans-serif" font-size="14" fill="#444" font-weight="normal" font-style="normal" text-anchor="start">DONE. Only the Playhead thread runs the model.</text> |
| <text x="1670.0" y="880" font-family="DejaVu Serif, Times New Roman, serif" font-size="20" fill="#1a1a1a" font-weight="normal" font-style="normal" text-anchor="middle">(b) One turn of the loop</text> |
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