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    hidden-markov-model

    0.0.1 • Public • Published

    hidden-markov-model

    Hidden Markov Models in JavaScript.

    NPM

    Install

    npm install hidden-markov-model
    bower install hidden-markov-model

    Usage

    This example uses the Forward algorithm to calculate the probability of an observed sequence.

    var HiddenMarkovModel = require('hidden-markov-model');
     
    var HMM = HiddenMarkovModel();
     
    HMM.setInitialStateVector([0.6, 0.4]); // 1. Healthy, 2. Fever
     
    HMM.setTransitionMatrix([
        // Heathly, Fever
        [0.7, 0.3], // Healthy
        [0.4, 0.6]  // Fever
    ]);
     
    HMM.setEmissionMatrix([
        // 1. Normal, 2. Cold, 3. Dizzy
        [0.5, 0.4, 0.1], // Healthy
        [0.1, 0.3, 0.6]  // Fever
    ]);
     
      /* What is the probability that the Hidden Markov Model is able to
       * generate the observed sequence of being Normal on day 1,
       * Cold on day2, and Dizzy on day 3?
       */
      var alpha = [];
      var result = HMM.forward([0, 1, 2], alpha); // Normal, Cold, Dizzy
      console.log(result); // 0.03628
     
      console.log(alpha);
      /* [ [ 0.3, 0.04000000000000001 ],
         [ 0.09040000000000001, 0.0342 ],
         [ 0.007696000000000001, 0.028584000000000002 ] ]
      */

    License

    MIT

    Install

    npm i hidden-markov-model

    DownloadsWeekly Downloads

    3

    Version

    0.0.1

    License

    MIT

    Last publish

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