(3)Unsupervised Learning-1 Unsupervised Learning Trying to find hidden structure in unlabeled data. Clear or unclear task. No error or reward signal to evaluate a potential solution. ·Clustering .Anomaly detection 10 DATA Copyright 2019 by Xiaoyu Li.Copyright © 2019 by Xiaoyu Li. 10 （3）Unsupervised Learning-1 Unsupervised Learning  Trying to find hidden structure in unlabeled data.  Clear or unclear task.  No error or reward signal to evaluate a potential solution.  Clustering  Anomaly detection