online_winnow.js

console.log("limdu online learning demo start");

//This example uses the Modified Balanced Margin Winnow classifier (Carvalho and Cohen, 2006):

var limdu = require('limdu');

var birdClassifier = new limdu.classifiers.Winnow({
	default_positive_weight: 1,
	default_negative_weight: 1,
	threshold: 0,
});

birdClassifier.trainOnline({'wings': 1, 'flight': 1, 'beak': 1, 'eagle': 1}, 1);  // eagle is a bird (1)
birdClassifier.trainOnline({'wings': 0, 'flight': 0, 'beak': 0, 'dog': 1}, 0);    // dog is not a bird (0)
console.dir(birdClassifier.classify({'wings': 1, 'flight': 0, 'beak': 0.5, 'penguin':1})); // initially, penguin is mistakenly classified as 0 - "not a bird"
console.dir(birdClassifier.classify({'wings': 1, 'flight': 0, 'beak': 0.5, 'penguin':1}, /*explanation level=*/4)); // why? because it does not fly.

birdClassifier.trainOnline({'wings': 1, 'flight': 0, 'beak': 1, 'penguin':1}, 1);  // learn that penguin is a bird, although it doesn't fly 
birdClassifier.trainOnline({'wings': 0, 'flight': 1, 'beak': 0, 'bat': 1}, 0);     // learn that bat is not a bird, although it does fly
console.dir(birdClassifier.classify({'wings': 1, 'flight': 0, 'beak': 1, 'chicken': 1})); // now, chicken is correctly classified as a bird, although it does not fly.  
console.dir(birdClassifier.classify({'wings': 1, 'flight': 0, 'beak': 1, 'chicken': 1}, /*explanation level=*/4)); // why?  because it has wings and beak.
console.log("limdu online learning demo end");