For risk-based feature importance (LOCO, SAGE), computing importance on an ensemble of models is more accurate than averaging individual models' importance scores, because model-level ensembling reduces the excess risk that dominates importance error.
org/10.1007/978-3-031-63797-1_22
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Aggregate Models, Not Explanations: Improving Feature Importance Estimation
For risk-based feature importance (LOCO, SAGE), computing importance on an ensemble of models is more accurate than averaging individual models' importance scores, because model-level ensembling reduces the excess risk that dominates importance error.