Patent 10956251 was granted and assigned to Hitachi, Ltd. on March, 2021 by the United States Patent and Trademark Office.
An object of the invention is to provide an abnormality detection device that can detect a processing abnormality of various types of software. The abnormality detection device according to the invention divides an output data series which is output by software into one or more clusters, determines that the output data included in any cluster is normal, and determines that the output data not included in any cluster is abnormal.