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BELLA: Black box model Explanations by Local Linear Approximations

Created by
  • Haebom

Author

Nedeljko Radulovic, Albert Bifet, Fabian Suchanek

Outline

This paper presents BELLA, a deterministic and model-agnostic posterior explanation method for individual predictions of black-box regression models. To overcome the limitations of existing posterior explanation methods—which rely on synthetic data generation, leading to uncertainty, low reliability, and limited applicability to a small number of data points—BELLA provides explanations in the form of linear models trained in the feature space. BELLA maximizes the size of the neighborhood within which the linear model is applied, generating accurate, simple, general, and robust explanations.

Takeaways, Limitations

Takeaways:
BELLA, a novel approach to explaining the predictions of black-box regression models, is presented.
Adopt a deterministic and model-agnostic method that does not rely on synthetic data generation.
Improved accuracy, simplicity, generality, and robustness of explanations
Provide explanations applicable to more data points
Limitations:
Further experiments are needed to determine how well BELLA's performance generalizes across a variety of black-box models and datasets.
Limitations of approaches that generate explanations using linear models (they may not account for nonlinear relationships well)
Computational cost issues that may arise in the process of maximizing the size of the neighborhood
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