Monday, August 29, 2011

Machine Learning Ex2 - Benchmarks

In my previous post, I implemented the algorithm for linear regression using gradient descent in Scala using two different methods: standard builtin mathematical methods and Scalala, a Scala linear algebra library.

Shortly after writing the solution I started to wondering if using Scalala had any performance impact on the runtime cost of the solution. While Scalala does have the overhead of object creation, it also makes heavy use of specialized classes, which should provide a considerable improvement.

I decided to do some naive benchmarking. These benchmarks are nowhere near scientific, but should provide a general sense of the solution's runtime. Since I was benchmarking the two Scala solutions, I decided to look at also the MATLAB/Octave and R solutions.

Sunday, August 21, 2011

Machine Learning Ex2 - Linear Regression

Implementing linear regression using gradient descent in Scala based on Andrew Ng's machine learning course.

Tuesday, August 9, 2011

Steal this database? Don't mind if I do.

A while back, issued an pseudo-challenge: steal their database.  Nothing that would result in the FBI knocking on your door mind you, but a look into their streaming API. streams all their public events and RSVPs via HTTP streaming or HTML5 websockets, so all the is required to steal their database is a connection to a stream and the ability to save the content.