Outlier determination rule generation device and outlier detection device, and outlier determination rule generation method and outlier detection method thereof

摘要

The outlier detection device for detecting abnormal data in a data set includes an outlier rule preservation unit for holding a set of rules characterizing abnormal data, a filtering unit for determining whether each data of the data set is abnormal data or not based on the rules held in the outlier rule preservation unit, a degree of outlier calculation unit for calculating a degree of outlier indicative of a degree of being abnormal with respect to each data determined not to be abnormal data by the filtering unit, a sampling unit for sampling each data whose degree of outlier is calculated by the degree of outlier calculation unit based on the calculated degree of outlier to apply a label indicating whether data is abnormal data or not to the sampled data, and a supervised learning unit for generating a new rule characterizing abnormal data by supervised learning based on a set of the respective data to which the label is applied and adding the new rule to the set of rules held in the outlier rule preservation unit to update the rules.