Nick Heiner NickHeiner

Weka's API is Cumbersome

I've only used Weka a bit, and it appears to be an impressive machine learning toolkit. However, its API is quite a pain to deal with.

Consider the following code that I wrote, which translates from one representation of an example to Instance, used by Weka:

public static Instance getInstance(WeatherLabeledFeatureVector featureVector, Instances instances) {
  Instance inst = new DenseInstance(instances.numAttributes());
  for (int i = 0; i  attInfo, int capacity) {

// ...

** Originally written in Fall 2011. **

Lessons Learned from Corpionage

This semester, I worked on Corpionage, a Facebook game for people who like to mess with their friends. I thought it turned out pretty well, but there are a few key take-aways.

Our general architecture:

	// Good approach
	'use strict';

	const coRequest = require('co-request'),
	tape = require('tape'),
	coTape = require('co-tape'),
	makeServer = require('../..');

	tape('heartbeat', function(t) {
	const app = makeServer();

	// Some setup code omitted for brevity
	nock('https://our-backend-service.opower.it')
	.post('/endpoint/we/depend/on')
	// Make your test more interesting by declaring which headers you care about
	// Nock lets you declare matchers on many aspects of the request
	.matchHeader('Content-type', 'application/json')
	.reply(200, function(uri, requestBody) {
	t.deepEqual(
	requestBody,
	expectedRequestBody,

	it('returns the correct value', function(done) {
	doAsyncWork().then(function(actualResult) {
	expect(actualResult).to.equal(expectedResult);
	}).finally(done);
	});

	it('returns the correct value', function() {
	return doAsyncWork().then(function(actualResult) {
	expect(actualResult).to.equal(expectedResult);
	});
	});

	it('returns the correct value', function() {
	makeServerRequest().then(function(response) {
	expect(response.statusCode).to.equal(200);
	});
	});

	t.test('returns the correct value', function(t) {
	t.plan(1);
	doAsyncWork().then(function(actualResult) {
	t.equal(actualResult, expectedResult);
	});
	})

	module MainTest

	open NUnit.Framework

	[<Test>]
	let ``When 2 is added to 2 expect 4``() =
	Assert.AreEqual(4, 2+2)

	[<Test>]
	let ``When 2 is added to 2 expect 5``() =

	> Install-Package NUnit
	> Install-Package NUnitTestAdapter