Proxy-Based Approximation of Shapley and Banzhaf Interactions
ProxySHAP addresses a critical bottleneck in model interpretability by dramatically accelerating computation of Shapley and Banzhaf interaction indices without sacrificing theoretical rigor. The method combines tree-based proxy models with residual correction to achieve polynomial-time complexity on tree ensembles, eliminating exponential scaling that plagued prior TreeSHAP variants. This matters because understanding feature interactions at scale has remained computationally prohibitive for practitioners deploying large ensemble models in production. The work bridges the speed-accuracy tradeoff that has constrained adoption of interaction-level explanations in real-world ML systems.
Modelwire context
ExplainerThe residual correction step is the part worth scrutinizing: proxy models introduce approximation error by design, and the correction mechanism is what separates this from prior fast-but-loose SHAP approximations. Whether that correction holds under distribution shift in production data is not addressed in the summary.
This sits in a cluster of papers from the same week pushing classical ML methods toward production viability through principled theoretical additions. The Lumberjack paper on differentially private random forests tackled a similar structural problem: tree ensembles are widely deployed but analytically expensive, and the solution was a novel algorithm with formal error bounds rather than a heuristic speedup. ProxySHAP follows the same pattern. The Ternary Decision Trees paper also signals growing appetite for uncertainty-aware outputs from tree-based models, which interaction indices directly support by revealing which feature pairs drive borderline predictions.
Watch whether ProxySHAP gets integrated into an existing interpretability library like SHAP or InterpretML within the next six months. Adoption at that level would confirm the polynomial-time guarantees hold on real production ensemble sizes, not just benchmark datasets.
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MentionsProxySHAP · TreeSHAP · Shapley · Banzhaf
Modelwire Editorial
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