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Society-Rapid Publ."],"accepted":{"date-parts":[[2023,1,10]]},"published-print":{"date-parts":[[2023]]},"abstract":"<jats:p>Extreme Learning Machines (ELMs) are a versatile Machine Learning (ML) algorithm that features as the main advantage the possibility of a seamless implementation with physical systems. Yet, despite the success of the physical implementations of ELMs, there is still a lack of fundamental understanding in regard to their optical implementations. In this context, this work makes use of an optical complex media and wavefront shaping techniques to implement a versatile optical ELM playground to gain a deeper insight into these machines. 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