PPT-1 Clustering: K-Means

Machine Learning 10601 Fall 2014 Bhavana Dalvi Mishra PhD student LTI CMU Slides are based on materials from Prof  Eric Xing Prof   William Cohen and Prof Andrew Ng. Margareta Ackerman. Work with . Shai. Ben-David, . Simina. . Branzei. , and David . Loker. . Clustering is one of the most widely used tools for exploratory data analysis.. . Social Sciences. Biology. Large-scale Single-pass k-Means . Clustering. Large-scale . k. -Means Clustering. Goals. Cluster very large data sets. Facilitate large nearest neighbor search. Allow very large number of clusters. Achieve good quality. Basic Concepts and Algorithms. Bamshad Mobasher. DePaul University. 2. What is Clustering in Data Mining?. Cluster:. a collection of data objects that are “similar” to one another and thus can be treated collectively as one group. Machine . Learning . 10-601. , Fall . 2014. Bhavana. . Dalvi. Mishra. PhD student LTI, CMU. Slides are based . on materials . from . Prof. . Eric Xing, Prof. . . William Cohen and Prof. Andrew Ng. K. -means. David Kauchak. CS 451 – Fall 2013. Administrative. Final project. Presentations on Friday. 3 minute max. 1-2 PowerPoint slides. E-mail me by 9am on Friday. What problem you tackled and results. Brendan and Yifang . April . 21 . 2015. Pre-knowledge. We define a set A, and we find the element that minimizes the error. We can think of as a sample of . Where is the point in C closest to X. . Lecture outline. Distance/Similarity between data objects. Data objects as geometric data points. Clustering problems and algorithms . K-means. K-median. K-center. What is clustering?. A . grouping. of data objects such that the objects . Suresh Merugu, IITR. Overview. Definition of Clustering. Existing Clustering Methods. Clustering Examples. Classification. Classification Examples. Cluster. : A collection of data objects. Similar to one another within the same cluster. What is clustering?. Why would we want to cluster?. How would you determine clusters?. How can you do this efficiently?. K-means Clustering. Strengths. Simple iterative method. User provides “K”. Chapter 9 Finding Groups of Data – Clustering with k-means Objectives The ways clustering tasks differ from the classification tasks we examined previously How clustering defines a group, and how such groups are identified 1. Mark Stamp. K-Means for Malware Classification. Clustering Applications. 2. Chinmayee. . Annachhatre. Mark Stamp. Quest for the Holy . Grail. Holy Grail of malware research is to detect previously unseen malware. 1. Mark Stamp. K-Means for Malware Classification. Clustering Applications. 2. Chinmayee. . Annachhatre. Mark Stamp. Quest for the Holy . Grail. Holy Grail of malware research is to detect previously unseen malware. clusters. CS771: Introduction to Machine Learning. Nisheeth. K. -means algorithm: . recap. 2. Notation: . or . is a . -dim one-hot vector. (. = 1 and . mean the same).  . K-means loss function: recap. Randomization tests. Cluster Validity . All clustering algorithms provided with a set of points output a clustering. How . to evaluate the “goodness” of the resulting clusters?. Tricky because .