Hidden Markov Models CISC 5800 Professor Daniel Leeds.

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Presentation transcript:

Hidden Markov Models CISC 5800 Professor Daniel Leeds

Representing sequence data Spoken language DNA sequences Daily stock values Example: spoken language F?r plu? fi?e is nine Between F and r expect a vowel: “aw”, “ee”, “ah”; NOT “oh”, “uh” At end of “plu” expect consonant: “g”, “m”, “s”; NOT “d”, “p” 2

Markov Models

A dice-y example Two colored die What is the probability we start at s A ? What is the probability we have the sequence of die choices: s A, s A ? What is the probability we have the sequence of die choices: s B, s A, s B, s A ? 4

A dice-y example What is the probability we have the sequence of die choices: s B, s A, s B, s A ? Dynamic programming: find answer for q t, then compute q t+1 5 State\Timet1t1 t2t2 t3t3 sAsA 0.3 sBsB 0.7

Hidden Markov Models 6 Q O A A A

Deducing die based on observed “emissions” Each color is biased A (red)B (blue) We see: 5What is probability of o=5 | B (blue) We see: 5, 3What is probability of o=5,3 | B, B? What is probability of o=5,3 and s=B,B What is MOST probable s | o=5,3? 7 oP(o|s A )P(o|s B )

Goal: calculate most likely states given observable data 8

9

Parameters in HMM 10 How do we learn these values?

First, assume we know the states 11

Learning HMM parameters: A i,j First, assume we know the states 12

First, assume we know the states 13

Challenges in HMM learning 14

Expectation-Maximization, or “EM” 15

Computing states q t 16

Details of forward and backward probabilities 17

E-step: State probabilities 18

Recall: when states known 19

M-step 20

Review of HMMs in action 21 For classification, find highest probability class given features Features for one sound: [q 1, o 1, q 2, o 2, …, q T, o T ] Conclude word: Generates states: Q O sound1sound2 sound3