MATLAB Programs and Exercises

Computer Programs
  1. Recognition score for HMMs using the Baum-Welch method. Write a MAT-LAB function named Baum_Welch_Do_HMM that takes as input: (a) a column vector of initial state probabilities pi_init, (b) the transition matrix A, whose (i, j) element is the probability of transition from state i to state j, (c) the matrix of the emission probabilities B, whose (i, j) element is the probability to emit the ith alphabet symbol from state j, and (d) a row vector O, which contains a sequence of the code numbers of discrete symbols. It returns the score produced when the HMM, defined by pi_init, A, B, is applied to the sequence of symbols contained in O. Assume that if the alphabet symbols are, say, S1, S2, …, ...

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