All files / lib/classifiers brain-classifier.js

100% Statements 49/49
89.47% Branches 17/19
100% Functions 12/12
100% Lines 46/46

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148                                              42x 42x                     442x 442x 394x                       442x 442x 442x 442x               105x 105x   105x 105x 1443x       1443x 1443x   105x                 6x 6x 5x 5x 15x     6x 15x 5x   1x                     623x 623x 446x     446x 269x     623x 260x 269x   541x                 25x 25x 25x 25x 25x 25x               39x 39x 39x       42x   42x  
/*
 * Copyright (c) AXA Group Operations Spain S.A.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
const NeuralNetwork = require('./neural-network');
const Classifier = require('./classifier');
 
/**
 * Classifier using Multilabel Neural Network
 */
class BrainClassifier extends Classifier {
  /**
   * Constructor of the class.
   * @param {Object} settings Settings for the instance.
   */
  constructor(settings) {
    super(settings);
    if (!this.settings.config) {
      this.settings.config = {
        activation: 'leaky-relu',
        hiddenLayers: [],
        iterations: 20000,
        learningRate: 0.7,
        errorThresh: 0.00005,
        momentum: 0.5,
        deltaErrorThresh: 0.000001,
        maxDecimals: 9,
        leakyReluAlpha: 0.08,
      };
    }
    this.settings.config.log = this.settings.log;
    this.settings.config.timeout = this.settings.timeout || 2 * 60 * 1000;
    this.labels = [];
    this.network = new NeuralNetwork(this.settings.config);
  }
 
  /**
   * Train the classifier given a dataset.
   * @param {Object} dataset Dataset with features and outputs.
   */
  async trainBatch(dataset, createNetwork = true) {
    Eif (createNetwork || !this.network) {
      this.network = new NeuralNetwork(this.settings.config);
    }
    const netDataset = [];
    dataset.forEach(item => {
      const netItem = {
        input: item.input,
        output: {},
      };
      netItem.output[item.output] = 1;
      netDataset.push(netItem);
    });
    return this.network.train(netDataset);
  }
 
  /**
   * Given a sample, return the classification.
   * @param {Object} sample Input sample.
   * @returns {Object} Classification output.
   */
  classify(sample) {
    const scores = [];
    if (Object.keys(sample).length > 0) {
      const result = this.network.run(sample);
      Object.keys(result).forEach(key => {
        scores.push({ label: key, value: result[key] });
      });
    }
    if (scores.length > 0) {
      scores.sort((x, y) => y.value - x.value);
      return scores;
    }
    return [{ label: 'None', value: 1 }];
  }
 
  /**
   * Given an observation and an array for inserting the results,
   * it calculates the score of the observation for each of the classifications
   * and fills the array with the result objects.
   * @param {Object} srcObservation Source observation.
   * @param {Object[]} classifications Array of classifications.
   */
  classifyObservation(observation, classifications) {
    const scores = [];
    if (Object.keys(observation).length > 0) {
      const result = this.network.isRunnable
        ? this.network.run(observation)
        : [];
      Object.keys(result).forEach(key => {
        scores.push({ label: key, value: result[key] });
      });
    }
    if (scores.length > 0) {
      scores.sort((x, y) => y.value - x.value);
      scores.forEach(x => classifications.push(x));
    } else {
      classifications.push({ label: 'None', value: 1 });
    }
  }
 
  /**
   * Clone the object properties.
   * @returns {Object} Cloned object.
   */
  toObj() {
    const result = {};
    result.className = this.constructor.name;
    result.settings = this.settings;
    result.labels = this.labels;
    result.network = this.network.toJSON();
    return result;
  }
 
  /**
   * Fills the instance from another object.
   * @param {Object} obj Source object.
   */
  fromObj(obj) {
    this.settings = obj.settings;
    this.labels = obj.labels;
    this.network.fromJSON(obj.network);
  }
}
 
Classifier.classes.BrainClassifier = BrainClassifier;
 
module.exports = BrainClassifier;