Example usage for org.apache.mahout.classifier.sequencelearning.hmm HmmAlgorithms forwardAlgorithm

Introduction

In this page you can find the example usage for org.apache.mahout.classifier.sequencelearning.hmm HmmAlgorithms forwardAlgorithm.

Prototype

public static Matrix forwardAlgorithm(HmmModel model, int[] observations, boolean scaled) 

Source Link

Document

External function to compute a matrix of alpha factors

Usage

From source file:org.eclipse.tracecompass.internal.totalads.algorithms.hiddenmarkovmodel.HmmMahout.java

License:Open Source License

/**
 * Returns the observation sequence's log likelihood based on a model
 *
 * @param sequence//from  www. ja  va 2s.  c  om
 *            Integer array of sequences
 * @return Log Likelihood
 */
public double observationLikelihood(int[] sequence) {

    Matrix m = HmmAlgorithms.forwardAlgorithm(fHmm, sequence, true);
    int lastCol = m.numCols() - 1;
    int numRows = m.numRows();
    double sum = 0.0;
    for (int i = 0; i < numRows; i++) {
        sum += m.getQuick(i, lastCol);
    }

    return sum;

}

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