Schaaf, NinaNinaSchaafHuber, MarcoMarcoHuberMaucher, JohannesJohannesMaucher2022-03-142022-03-142019https://publica.fraunhofer.de/handle/publica/40678510.1109/ICMLA.2019.00016One 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 L1-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 L1-orthogonal regularization yields models of lower complexity and at the same time higher fidelity compared to other regularizers.enExplainable Artificial Intelligence (XAI)neuronales Netzneuronales Netzwerkconference paper