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This report presents a project of TPIVb at LPHE in which I used deep neural networks (DNN) to distinguish heavy neutral leptons decays with 3 leptons in the final state from various types of background. At least one of the 3 leptons is required to be a hadronic tau. The events used to train the DNN were created through a Monte Carlo simulation. Several kinematic variables were created out of variables that can typically be extracted from the quantities reconstructed by CMS, to be used as features for the DNN. A feature selection was done to determine which of these features plays a significant role in the DNN's ability to distinguish signal versus background. Finally, the performance of the DNN was evaluated in the different signal points.