A probabilistic resource allocating network for novelty detection

  • Authors:
  • Stephen Roberts;Lionel Tarassenko

  • Affiliations:
  • -;-

  • Venue:
  • Neural Computation
  • Year:
  • 1994

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Abstract

The detection of novel or abnormal input vectors is ofimportance in many monitoring tasks, such as fault detection incomplex systems and detection of abnormal patterns in medicaldiagnostics. We have developed a robust method for noveltydetection, which aims to minimize the number of heuristicallychosen thresholds in the novelty decision process. We achieve thisby growing a gaussian mixture model to form a representation of atraining set of "normal" system states. When previously unseen dataare to be screened for novelty we use the same threshold aswas used during training to define a novelty decision boundary. Weshow on a sample problem of medical signal processing that thismethod is capable of providing robust novelty decision boundariesand apply the technique to the detection of epileptic seizureswithin a data record.