Extreme Learning Machine (ELM) and OPELM(’s)

Amaury Lendasse (Aalto University, Finlande)
vendredi 28 septembre 2012

Résumé : Neural networks (NN) and support vector machines (SVM) play key roles in machine learning and data analysis in the past 2-3 decades. However, it is known that these popular learning techniques face some challenging issues such as : intensive human intervene, slow learning speed, poor learning scalability. A "new" learning technique referred to as Extreme Learning Machine (ELM) is facing such problems. ELM not only learns up to tens of thousands faster than NN and SVMs, but also provides unified implementation for regression, binary and multi-class applications. In this seminar, the basic ELM, the optimally pruned extreme learning machine (OP-ELM) methodology and the TROP-ELM are presented. Both OP-ELM and TROP-ELM are based on the original extreme learning machine (ELM) algorithm with additional steps to make it more robust and generic. Both methodologies are presented in detail and then applied to several regression and classification problems. Results for both computational time and accuracy (mean square error) are compared to the original ELM and to three other widely used methodologies : multilayer perceptron (MLP), support vector machine (SVM), and Gaussian process (GP). As the experiments for both regression and classification illustrate, the proposed OP-ELM and the TRO-ELM methodologies perform several orders of magnitude faster than the other algorithms used, except the original ELM. Despite the simplicity and fast performance, OP-ELM and TROP-ELM are still able to maintain an accuracy that is comparable to the performance of the SVM.

Cet exposé se tiendra en salle C20-13, 20ème étage, Université Paris 1, Centre Pierre Mendès-France, 90 rue de Tolbiac, 75013 Paris (métro : Olympiades).











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