SupplementaryMaterialforLearningoutsidethe Black-Box: Thepursuitofinterpretablemodels

This lemma is a trivial consequence of the definition of Meijer G-functions. The only nontrivial step in the abovereasoning is going from the second to the third line. To speed up the process, the experiments are done by using a restriction ofGH excluding the inverse trigonometric functions as well as some Bessel functions. Also note that, as suggested by LIME,X8, X9 also have an important weight in this polynomial. Wefinishonalast remark on the benefits offered by our projection pursuit approach. Wesee that both the symbolic model and its local approximation take a very concise form when we consider the new variables zk, k =1,...,K.