K-means and Hierarchical Clustering

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1 Note to other teachers and users of these sldes. Andrew would be delghted f you found ths source materal useful n gvng your own lectures. Feel free to use these sldes verbatm, or to modfy them to ft your own needs. PowerPont orgnals are avalable. If you make use of a sgnfcant porton of these sldes n your own lecture, please nclude ths message, or the followng lnk to the source repostory of Andrew s tutorals: Comments and correctons gratefully receved. K-means and Herarchcal Clusterng Andrew W. Moore Assocate Professor School of Computer Scence Carnege Mellon Unversty awm@cs.cmu.edu Copyrght 00, Andrew W. Moore Nov 6th, 00 Some Data Ths could easly be modeled by a Gaussan Mxture (wth 5 components) But let s look at an satsfyng, frendly and nfntely popular alternatve Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde

2 Suppose you transmt the coordnates of ponts drawn randomly from ths dataset. You can nstall decodng software at the recever. You re only allowed to send two bts per pont. It ll have to be a lossy transmsson. Loss = Sum Squared Error between decoded coords and orgnal coords. What encoder/decoder wll lose the least nformaton? Lossy Compresson Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 3 Suppose you transmt the coordnates of ponts drawn randomly from ths dataset. You can nstall decodng software at the recever. You re only allowed to send two bts per pont. It ll have to be a lossy transmsson. Loss = Sum Squared Error between decoded coords and orgnal coords. What encoder/decoder wll lose the least nformaton? Break nto a grd, decode each bt-par as the mddle of each grd-cell Idea One Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde Any Better Ideas?

3 Suppose you transmt the coordnates of ponts drawn randomly from ths dataset. You can nstall decodng software at the recever. You re only allowed to send two bts per pont. It ll have to be a lossy transmsson. Loss = Sum Squared Error between decoded coords and orgnal coords. What encoder/decoder wll lose the least nformaton? Break nto a grd, decode each bt-par as the centrod of all data n that grd-cell Idea Two Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde Any Further Ideas? K-means. Ask user how many clusters they d lke. (e.g. k=5) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 6 3

4 K-means. Ask user how many clusters they d lke. (e.g. k=5). Randomly guess k cluster Center locatons Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 7 K-means. Ask user how many clusters they d lke. (e.g. k=5). Randomly guess k cluster Center locatons 3. Each datapont fnds out whch Center t s closest to. (Thus each Center owns a set of dataponts) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 8 4

5 K-means. Ask user how many clusters they d lke. (e.g. k=5). Randomly guess k cluster Center locatons 3. Each datapont fnds out whch Center t s closest to. 4. Each Center fnds the centrod of the ponts t owns Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 9 K-means. Ask user how many clusters they d lke. (e.g. k=5). Randomly guess k cluster Center locatons 3. Each datapont fnds out whch Center t s closest to. 4. Each Center fnds the centrod of the ponts t owns 5. and umps there 6. Repeat untl termnated! Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 0 5

6 K-means Start Advance apologes: n Black and Whte ths example wll deterorate Example generated by Dan Pelleg s super-duper fast K-means system: Dan Pelleg and Andrew Moore. Acceleratng Exact k-means Algorthms wth Geometrc Reasonng. Proc. Conference on Knowledge Dscovery n Databases 999, (KDD99) (avalable on Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 6

7 K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 3 K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 4 7

8 K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 5 K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 6 8

9 K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 7 K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 8 9

10 K-means contnues Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 9 K-means termnates Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 0 0

11 K-means Questons What s t tryng to optmze? Are we sure t wll termnate? Are we sure t wll fnd an optmal clusterng? How should we start t? How could we automatcally choose the number of centers?.we ll deal wth these questons over the next few sldes Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde Dstorton Gven.. an encoder functon: ENCODE : R m [..k] a decoder functon: DECODE : [..k] R m Defne Dstorton ( x DECODE[ ENCODE( x)] ) = R = Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde

12 Dstorton Gven.. an encoder functon: ENCODE : R m [..k] a decoder functon: DECODE : [..k] R m Defne Dstorton ( x DECODE[ ENCODE( x)] ) = R = We may as well wrte DECODE[ ] = c so Dstorton = R = ( x c ENCODE ( x ) ) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 3 The Mnmal Dstorton Dstorton = R = ( x c What propertes must centers c, c,, c k have when dstorton s mnmzed? ENCODE ( x )) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 4

13 The Mnmal Dstorton () Dstorton What propertes must centers c, c,, c k have when dstorton s mnmzed? () x must be encoded by ts nearest center.why? = R = ( x c ENCODE ( x )) c ENCODE ( x ) = argmn ( x c ) c { c, c,... c }..at the mnmal dstorton k Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 5 The Mnmal Dstorton () Dstorton = R = ( x c What propertes must centers c, c,, c k have when dstorton s mnmzed? () x must be encoded by ts nearest center.why? Otherwse dstorton could be reduced by replacng ENCODE[x ] by the nearest center c ENCODE ( x )) ENCODE ( x ) = argmn ( x c ) c { c, c,... c }..at the mnmal dstorton k Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 6 3

14 The Mnmal Dstorton () Dstorton = R = ( x c What propertes must centers c, c,, c k have when dstorton s mnmzed? () The partal dervatve of Dstorton wth respect to each center locaton must be zero. ENCODE ( x )) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 7 () The partal dervatve of Dstorton wth respect to each center locaton must be zero. Dstorton Dstorton c = = = = = R = k = OwnedBy( c ) c ( x c ENCODE ( x ) ( x c ( x c OwnedBy( c ) ( x OwnedBy( c ) c 0 (for a mnmum) ) ) ) ) OwnedBy(c ) = the set of records owned by Center c. Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 8 4

15 () The partal dervatve of Dstorton wth respect to each center locaton must be zero. Dstorton = = R = k ( x c ENCODE ( x ) ( x c = OwnedBy( c ) ) ) Dstorton c = c = ( x c OwnedBy( c ) ( x OwnedBy( c ) c = 0 (for a mnmum) Thus, at a mnmum: c = OwnedBy( c Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 9 ) ) ) x OwnedBy( c ) At the mnmum dstorton Dstorton = R = ( x c What propertes must centers c, c,, c k have when dstorton s mnmzed? () x must be encoded by ts nearest center () Each Center must be at the centrod of ponts t owns. ENCODE ( x )) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 30 5

16 Improvng a suboptmal confguraton Dstorton What propertes can be changed for centers c, c,, c k have when dstorton s not mnmzed? () Change encodng so that x s encoded by ts nearest center () Set each Center to the centrod of ponts t owns. There s no pont applyng ether operaton twce n successon. But t can be proftable to alternate. And that s K-means! = R = ( x c Easy to prove ths procedure wll termnate n a state at whch nether () or () change the confguraton. Why? Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 3 ENCODE ( x )) Improvng a suboptmal confguraton What propertes can be changed for centers c, c,, c k have when dstorton s not mnmzed? () Change encodng so that x s encoded by ts nearest center () Set each Center to the centrod of ponts t owns. There s no pont applyng ether operaton twce n successon. But t can be proftable to alternate. And that s K-means! There are only a fnte number of ways of parttonng R records nto k groups. Dstorton = R = ( x c Easy to prove ths procedure wll termnate n a state at whch nether () or () change the confguraton. Why? Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 3 ENCODE ( x )) So there are only a fnte number of possble confguratons n whch all Centers are the centrods of the ponts they own. If the confguraton changes on an teraton, t must have mproved the dstorton. So each tme the confguraton changes t must go to a confguraton t s never been to before. So f t tred to go on forever, t would eventually run out of confguratons. 6

17 Wll we fnd the optmal confguraton? Not necessarly. Can you nvent a confguraton that has converged, but does not have the mnmum dstorton? Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 33 Wll we fnd the optmal confguraton? Not necessarly. Can you nvent a confguraton that has converged, but does not have the mnmum dstorton? (Hnt: try a fendsh k=3 confguraton here ) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 34 7

18 Wll we fnd the optmal confguraton? Not necessarly. Can you nvent a confguraton that has converged, but does not have the mnmum dstorton? (Hnt: try a fendsh k=3 confguraton here ) Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 35 Tryng to fnd good optma Idea : Be careful about where you start Idea : Do many runs of k-means, each from a dfferent random start confguraton Many other deas floatng around. Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 36 8

19 Tryng to fnd good optma Idea : Be careful about where you start Idea : Do many runs of k-means, each from a dfferent random start confguraton Neat trck: Place frst center on top of randomly chosen datapont. Many other deas floatng around. Place second center on datapont that s as far away as possble from frst center : Place th center on datapont that s as far away as possble from the closest of Centers through - : Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 37 Choosng the number of Centers A dffcult problem Most common approach s to try to fnd the soluton that mnmzes the Schwarz Crteron (also related to the BIC) Dstorton +? (# parameters ) log R = Dstorton +?mk log R m=#dmensons k=#centers R=#Records Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 38 9

20 Common uses of K-means Often used as an exploratory data analyss tool In one-dmenson, a good way to quantze realvalued varables nto k non-unform buckets Used on acoustc data n speech understandng to convert waveforms nto one of k categores (known as Vector Quantzaton) Also used for choosng color palettes on old fashoned graphcal dsplay devces! Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 39 Sngle Lnkage Herarchcal Clusterng. Say Every pont s t s own cluster Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 40 0

21 Sngle Lnkage Herarchcal Clusterng. Say Every pont s t s own cluster. Fnd most smlar par of clusters Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 4 Sngle Lnkage Herarchcal Clusterng. Say Every pont s t s own cluster. Fnd most smlar par of clusters 3. Merge t nto a parent cluster Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 4

22 Sngle Lnkage Herarchcal Clusterng. Say Every pont s t s own cluster. Fnd most smlar par of clusters 3. Merge t nto a parent cluster 4. Repeat Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 43 Sngle Lnkage Herarchcal Clusterng. Say Every pont s t s own cluster. Fnd most smlar par of clusters 3. Merge t nto a parent cluster 4. Repeat Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 44

23 Sngle Lnkage Herarchcal Clusterng How do we defne smlarty between clusters? Mnmum dstance between ponts n clusters (n whch case we re smply dong Eucldan Mnmum Spannng Trees) Maxmum dstance between ponts n clusters Average dstance between ponts n clusters You re left wth a nce dendrogram, or taxonomy, or herarchy of dataponts (not shown here). Say Every pont s t s own cluster. Fnd most smlar par of clusters 3. Merge t nto a parent cluster 4. Repeat untl you ve merged the whole dataset nto one cluster Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 45 Also known n the trade as Herarchcal Agglomeratve Clusterng (note the acronym) Sngle Lnkage Comments It s nce that you get a herarchy nstead of an amorphous collecton of groups If you want k groups, ust cut the (k-) longest lnks There s no real statstcal or nformatontheoretc foundaton to ths. Makes your lecturer feel a bt queasy. Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 46 3

24 What you should know All the detals of K-means The theory behnd K-means as an optmzaton algorthm How K-means can get stuck The outlne of Herarchcal clusterng Be able to contrast between whch problems would be relatvely well/poorly suted to K- means vs Gaussan Mxtures vs Herarchcal clusterng Copyrght 00, Andrew W. Moore K-means and Herarchcal Clusterng: Slde 47 4

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