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Explaining Concept Drift through the Evolution of Group Counterfactuals

Created by
  • Haebom

Author

Ignacy St\k{e}pka, Jerzy Stefanowski

Outline

This paper presents a novel methodology for explaining concept drift, which causes performance degradation in machine learning models in dynamic environments. Unlike previous research on concept drift detection, we focus on explaining how and why the model's decision-making logic changes. To this end, we explain concept drift by analyzing the temporal evolution of group-based counterexample explanations (GCEs). By tracking the shifts in the cluster centers of GCEs and their associated counterexample action vectors, we reveal structural changes in the model's decision boundaries and underlying logic. The analysis is performed within a three-layer framework that combines the data layer (distributional shift), the model layer (prediction mismatch), and the proposed explanation layer, enabling us to distinguish between various root causes, such as spatial data shift and concept relabeling.

Takeaways, Limitations

Takeaways:
We present a novel methodology that more clearly explains the causes of concept shifts by leveraging group-based counterexamples (GCEs).
Comprehensive diagnosis of concept movement is possible through integrated analysis of data layer, model layer, and explanation layer.
Ability to distinguish between various causes of concept movement, including spatial data movement and concept relabeling.
Visually understand the structural changes in the model's decision boundaries and underlying logic.
Limitations:
Further research is needed to evaluate the generalization performance of the proposed methodology and its applicability to various machine learning models.
There is a need to improve the computational complexity and efficiency of GCEs.
Further experiments and verification of effectiveness and applicability in real-world applications are needed.
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