Multi-task bilevel optimization with general lower-level convexity is recast as equality-constrained multi-objective optimization and solved by a weighted Chebyshev penalty algorithm achieving O(S T^{-1/2}) convergence to KKT-based Pareto stationarity.
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A Tale of Two Problems: Multi-Task Bilevel Learning Meets Equality Constrained Multi-Objective Optimization
Multi-task bilevel optimization with general lower-level convexity is recast as equality-constrained multi-objective optimization and solved by a weighted Chebyshev penalty algorithm achieving O(S T^{-1/2}) convergence to KKT-based Pareto stationarity.