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Machine learning approaches try to recognize network connection patterns to classify unseen and known intrusions but also require periodic re-training to keep the performances at a high level. In this paper, a novel continuous learning intrusion detection system, called Soft-Forgetting Self-Organizing Incremental Neural Network (SF-SOINN), is introduced. SF-SOINN, besides providing continuous learning capabilities, is able to perform fast classification, is robust to noise, and it obtains good performances with respect to the existing approaches. The main characteristic of SF-SOINN is the ability to remove nodes from the neural network based on their utility estimate. SF-SOINN has been validated on the well-known NSL-KDD and CIC-IDS-2017 intrusion detection datasets as well as on some artificial data to show the classification capability on more general tasks. <\/jats:p>","DOI":"10.1142\/s012906572150060x","type":"journal-article","created":{"date-parts":[[2021,11,15]],"date-time":"2021-11-15T07:45:46Z","timestamp":1636962346000},"source":"Crossref","is-referenced-by-count":10,"title":["A Continuous Learning Approach for Real-Time Network Intrusion Detection"],"prefix":"10.1142","volume":"31","author":[{"given":"Marcello Rinaldo","family":"Martina","sequence":"first","affiliation":[{"name":"Department of Mathematics, Computer Science, and Physics, University of Udine, Via delle, Scienze 206, Udine, 33100, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gian Luca","family":"Foresti","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Computer Science, and Physics, University of Udine, Via delle, Scienze 206, Udine, 33100, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"219","published-online":{"date-parts":[[2021,11,13]]},"reference":[{"key":"S012906572150060XBIB001","first-page":"1","volume-title":"th IFIP Int. 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