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Multi-Task Learning

Dec 25, 2025 Recommendation Systems 19 min read

Recommendation Systems (9): Multi-Task Learning and Multi-Objective Optimization

How real recommenders juggle clicks, conversions, watch time and revenue at once. Shared-Bottom, ESMM, MMoE, PLE explained from first principles, with PyTorch code, loss-balancing strategies and the gradient-conflict …

May 31, 2025 Transfer Learning 20 min read

Transfer Learning (6): Multi-Task Learning

Train one model on multiple tasks simultaneously. Covers hard vs. soft parameter sharing, gradient conflicts (PCGrad, GradNorm, CAGrad), auxiliary task design, and a complete multi-task framework with dynamic weight …