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Joint Shapley values: a measure of joint feature importance

ICLR 2022 · Label-efficient and robust learning › Recognition and long-tail · approach: Feature attribution methods · 2 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Measure coalitions by their average marginal contribution, rather than interaction relative to constituent featuresFeature attribution · Majority game (n=3)value for the full coalition: Shapley interaction index: -2; Shapley-Taylor, k=3: -2; Joint Shapley, k=3: \nicefrac{3}{21}Mixed
Use presence-adjusted rather than absolute local values for global attributionJoint Shapley global attribution for binary features · Binary-feature ML attributionconsistency with local intuitionsHelped
Include correlated features x1 and x2 together in the coalitionJoint Shapley · Simulated correlated features, f2(x), x2=1-x1global joint Shapley value: 0No clear effect
Include correlated features x1 and x2 together in the coalitionJoint Shapley · Simulated correlated features, f3(x), x2=1-x1global joint Shapley value: 0.122 -> 0.098Helped
Increase explanation order from k=2 to k=3Joint Shapley · Boston housingglobal joint Shapley value for LSTAT: 0.63 -> 0.42Hurt

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