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test.js
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test.js
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var utils = require('./utils');
var DTree = require('./dtree');
var fs = require('fs');
var _ = require('lodash');
// BEFORE
var examples = JSON.parse(fs.readFileSync('data.json').toString());
var target = 'wait';
var attributes = ["alternative", "bar", "fri_or_sat", "hungry", "patrons", "price", "rain", "reservation", "type", "waiting_time"];
// UNIT TESTS
var tests = [
// 1. Entropy
function() {
var entropy = utils.entropy(target, examples);
return floatEqual(entropy, 1.0, 0.0001);
},
// 2. Sum
function() {
var arr = [10,10,10,10,10,10,10,10,10,10];
var sum = utils.sum(arr);
return integerEqual(sum, 100);
},
// 3. Proportion
function() {
var proportion = utils.proportion(true, _.pluck(examples, target));
return floatEqual(proportion, 0.5, 0.1);
},
// 4. Ent
function() {
var entropy = utils.ent([0.5,0.5]);
return floatEqual(entropy, 1.0, 0.1);
},
// 5. Remainder
function() {
var remainder = utils.remainder('patrons', examples, target);
return floatEqual(remainder, 0.4592, 0.0001);
},
// 6. Information Gain
function() {
var ig = utils.informationGain('patrons', examples, target);
return floatEqual(ig, 0.541, 0.001);
},
// 7. Plurality Value
function() {
var pv = utils.pluralityValue(examples, 'price');
return integerEqual(pv, 1);
},
// 8. Choose Attribute
function() {
var attr = utils.chooseAttribute(examples, attributes, target);
return stringEqual(attr, 'patrons')
},
// 9. DTree
function() {
var dtree = new DTree(examples, attributes, target);
var prediction = dtree.predict({ patrons: 3 });
return booleanEqual(prediction, false);
}
];
module.exports = tests;
// ASSERTIONS
var run = function(test) {
return test();
}
var floatEqual = function(a, b, tolerance) {
return Math.abs(a-b) <= tolerance;
}
var integerEqual = function(a, b) {
return a === b;
}
var booleanEqual = function(a, b) {
return a === b;
}
var stringEqual = function(a, b) {
return a === b;
}
// TEST SCRIPT
var passed = 0;
var failed = 0;
tests.forEach(function(test, i) {
if (test()) {
console.log('test %d passed', i+1);
passed++;
} else {
console.log('test %d failed', i+1);
failed++;
}
});
console.log('DONE! %d passed, %d failed', passed, failed);