Dishonest casino as an HMM
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1 Dshnes casn as an HMM N = 2, ={F,L} M=2, O = {h,} A = F B= [. F L F L ] h L c Deva ubramanan,
2 A generave mdel fr CpG slands There are w hdden saes: CpG and nn-cpg. Each sae s characerzed by emssn prbables f he 4 bases. Yu can see whch sae he mdel s, nly he emed bases are vsble. CpG A: C: G: T: Nn-CpG A: C: G: T: Hdden sae Observables c Deva ubramanan,
3 Flerng r he frward cmpuan Gven an HMM mdel A,B,p, and an bservan sequence, can we fnd he ms lely hdden sae a me,? : flerng Observan sequence: h h Wha s he hdden sae here F r L? c Deva ubramanan,
4 Flerng cnd. [ 0] h h 0.95 Fs h:0.5 : L h:0. : Wha s he dsrbun f? nce, s 0 =F, we can say ha 0 =[ ], based n he ransn prbables alne. Bu s ha all we nw? c Deva ubramanan,
5 Mre flerng [ 0] h h 0.95 Fs L 0.9 We have als bserved h a me. Hw can we fld n n he assessmen f he dsrbun f? h:0.5 :0.5 h:0. :0.9 c Deva ubramanan,
6 c Deva ubramanan, Flerng cnd L h h L F h h F Therefre, =[ ]
7 c Deva ubramanan, Flerng cmpuan - [p -p] F L......, s s s Recursvely cmpued
8 c Deva ubramanan, ummary: flerng n a b n s c T n n, Termnan :, Recursn :, Inalze :.,,..., Defne.,...,,,..., Fnd T, 0 0 Tme cmplexy On 2 T
9 mhng/pserr decdng h h Quesn: can we re-esmae he dsrbun a where <, usng nfrman abu he bserved sequence up me? Tha s, wha s? c Deva ubramanan,
10 c Deva ubramanan, Bacward cmpuan,...,,...,,..., c Frward cmpuan, Recursn :., Inalze :.,..., Defne, T N N T b a c N s Bacward cmpuan Tme cmplexy: On 2 T
11 serr decdng,..., c c Deva ubramanan,
12 Full Decdng Gven HMM mdel A,B,p, and an bservan sequence, can we fnd he ms lely hdden sae sequence s s? argmax_{s s } s s c Deva ubramanan,
13 c Deva ubramanan, The Verb algrhm n T s s b a n s s, 0,...,, max Recursn :, Inalze :,...,,,,..., max Cmpuanal cmplexy = OTn 2
14 Learnng an HMM: case Gven bservan sequences, and he crrespndng hdden sae sequences, can we fnd he ms lely mdel A,B,p whch generaed? F F F L L F F h h Tranng daa c Deva ubramanan,
15 arameer esman Inal sae dsrbun Fracn f mes sae s sae n ranng daa Transn prbables a = number f ransns frm /number f ransns frm Emssn prbables b = number f mes s emed n sae /number f mes sae ccurs c Deva ubramanan,
16 Learnng an HMM: case 2 Gven us he bservan sequences, can we fnd he ms lely mdel = A,B,p whch generaed? argmax... Annaed ranng daa s dffcul ge; s we wuld le derve mdel parameers frm bservable sequences. c Deva ubramanan,
17 The EM algrhm. Guess a mdel 2. Use bservan sequence esmae ransn prbables, emssn prbables, and nal sae prbables. 3. Updae mdel 4. Repea 2 and 3 ll n change n mdel c Deva ubramanan,
18 Re-esmang parameers Wha s he prbably f beng n sae a me and mvng sae, gven he curren mdel and he bservan sequence O?,, O, c Deva ubramanan,
19 c Deva ubramanan, Usng frward and bacward cmpuan n n b a b a, O O +
20 Re-esmang a The ransn prbables a can be re-esmaed as fllws aˆ T T n ',, ' c Deva ubramanan,
21 Inal sae prbables N, Expeced number f mes n sae Inal sae prbables are smply c Deva ubramanan,
22 Emssn prbables ˆ b expeced number f mes n sae and bserve symbl expeced number f mes n sae bˆ T T c Deva ubramanan,
23 The EM algrhm. Guess a mdel a, b, 2. Use bservan sequence esmae, and 3. Use hese esmaes recalculae ' a', b', ' 4. Repea 2 and 3 ll n change n mdel c Deva ubramanan,
24 ummary f CpG sland HMM Gven a DNA regn x, Verb decdng predcs lcans f CpG slands n. Gven a nuclede x, Verb decdng ells wheher x s n a CpG sland n he ms lely sequence. serr decdng can assgn lcally pmal predcns f CpG slands. A fully annaed ranng daa se can be used esmae he generang HMM. Even whu annans, we can use he EM prcedure derve mdel parameers. c Deva ubramanan,
25 Hw desgn an HMM fr a new prblem Archecure/plgy desgn: Wha are he saes, bservan symbls, and he plgy f he sae ransn graph? Learnng/Tranng: Fully annaed r parally annaed ranng daases arameer esman by maxmum lelhd r by EM Valdan/Tesng: Fully annaed esng daases erfrmance evaluan accuracy, specfcy and sensvy c Deva ubramanan,
26 HMM mdel srucure Duran mdelng Fs h:0.5 : L h:0. : Wha s he prbably f sayng wh he far cn fr T me seps? c Deva ubramanan,
27 Inheren lman f HMMs The duran n sae F fllws an expnenally decayng dsrbun called a gemerc dsrbun. X T F 0.95 T 0.05 The gemerc dsrbun gves much prbably shr sequences f Fs and Ls and lle medum and lng sequences f Fs and Ls. c Deva ubramanan,
28 Duran mdelng T ban nn-gemerc lengh dsrbuns, we use an array f n F saes, as fllws: pp p p p p p F F F n=3 L n Ln n X L p p Generaed lengh dsrbun s a negave bnmal. c Deva ubramanan,
29 Why des hs maer? Exn Inrn Gemerc ds Exn lengh ds L Lengh f say n Exn sae deermnes lengh f predced exns. Very shr exns are rare. mlarly fr nrns. Inrns shrer han 30 bp d n exs. c Deva ubramanan,
30 Lengh dsrbuns f exns and nrns c Deva ubramanan,
31 Generalzed HMMs sem-marv HMMs Each sae has a specfed lengh dsrbun. E I N self-ransns Exn Inrn generae exra symbls c a sae sar a =. Repea c he lengh f say d n curren sae frm dsrbun. Em d symbls n curren sae. c a new sae accrdng a marx and ransn a me +d c Deva ubramanan,
32 Example Mulple symbls emed n each sae. One ne mappng beween symbls and hdden saes s ls n he generalzed HMM. c Deva ubramanan,
33 c Deva ubramanan, Verb algrhm fr ghmms Jus le Verb fr HMMs, bu we use he enre say n sae nsead f a sae a a gven me. - s s --,, max max 0,, 0.. a l b f f r r rbably f ms lely pah endng a wh say f + n sae fllwng a say n sae
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