{"type":"excalidraw","version":2,"source":"https://AwesomeSystemDesign.dev","elements":[{"angle":0,"strokeColor":"#628572","backgroundColor":"#edf5ee","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-1"}],"updated":0,"link":null,"locked":false,"id":"shape-0","type":"rectangle","seed":41,"x":30,"y":30,"width":459.55012000000005,"height":82.80000000000001,"customData":{"revealStep":1}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-1"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-1","type":"text","seed":114,"x":50,"y":48,"width":419.55012000000005,"height":46.800000000000004,"fontSize":18,"fontFamily":1,"text":"Why multi-task?\nDifferent user actions have different value:","originalText":"Why multi-task?\nDifferent user actions have different 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Low Very high Noisy (clickbait)\nWatch >50% Medium High Good\nPurchase Very high Low Excellent\nLike/Save Medium Medium Good\nShare High Low Excellent","originalText":"Click Low Very high Noisy (clickbait)\nWatch >50% Medium High Good\nPurchase Very high Low Excellent\nLike/Save Medium Medium Good\nShare High Low 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(optimize clicks only):\n→ System learns to recommend clickbait\n→ High CTR but low user satisfaction","originalText":"Single-objective (optimize clicks only):\n→ System learns to recommend clickbait\n→ High CTR but low user satisfaction","textAlign":"left","verticalAlign":"middle","containerId":"shape-6","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":4}},{"angle":0,"strokeColor":"#628572","backgroundColor":"#edf5ee","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-5"],"frameId":null,"roundness":null,"boundElements":[{"type":"text","id":"shape-9"}],"updated":0,"link":null,"locked":false,"id":"shape-8","type":"rectangle","seed":625,"x":30,"y":540,"width":670.36504,"height":176.4,"customData":{"revealStep":5}},{"angle":0,"strokeColor":"#394557","backgroundColor":"transparent","fillStyle":"solid","strokeWidth":1.5,"strokeStyle":"solid","roughness":0.7,"opacity":100,"version":1,"versionNonce":1,"isDeleted":false,"groupIds":["step-5"],"frameId":null,"roundness":null,"boundElements":null,"updated":0,"link":null,"locked":false,"id":"shape-9","type":"text","seed":698,"x":50,"y":558,"width":630.36504,"height":140.4,"fontSize":18,"fontFamily":1,"text":"Multi-task (optimize weighted combination):\n→ final_score = 0.1×P(click) + 0.3×P(watch>50%) + 0.4×P(purchase)\n0.1×P(like) + 0.1×P(share)\n→ Balanced optimization across all engagement signals\n→ Shared lower layers learn general representations\n→ Task-specific heads specialize per signal","originalText":"Multi-task (optimize weighted combination):\n→ final_score = 0.1×P(click) + 0.3×P(watch>50%) + 0.4×P(purchase)\n0.1×P(like) + 0.1×P(share)\n→ Balanced optimization across all engagement signals\n→ Shared lower layers learn general representations\n→ Task-specific heads specialize per signal","textAlign":"left","verticalAlign":"middle","containerId":"shape-8","lineHeight":1.3,"autoResize":false,"customData":{"revealStep":5}}],"appState":{"viewBackgroundColor":"#fbfbf8","gridSize":null},"files":{}}