Enhancing Decision Tree based Interpretation of Deep Neural Networks through L1-Orthogonal Regularization
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One obstacle that so far prevents the introduction of machine learning models primarily in critical areas is the lack of explainability. In this work, a practicable approach of gaining explainability of deep artificial neural networks (NN) using an interpretable surrogate model based on decision trees is presented. Simply fitting a decision tree to a trained NN usually leads to unsatisfactory results in terms of accuracy and fidelity. Using -orthogonal regularization during training, however, preserves the accuracy of the NN, while it can be closely approximated by small decision trees. Tests with different data sets confirm that -orthogonal regularization yields models of lower complexity and at the same time higher fidelity compared to other regularizers.
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