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Multi-task learningExpertExperimental design8 min
Situation
Joint training improves a high-resource generation task while a low-resource classification task falls below its single-task baseline. Aggregate validation loss still looks healthy.
Build an ablation plan that separates sampling imbalance, gradient conflict, loss-scale mismatch, representation bottlenecks, and head-specific underfitting. What evidence would justify each intervention?
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