There are several useful Ruby gems/libraries for using Support Vector Machines (SVM) and another to convert text into SVM style feature vectors. I recently packaged up what I needed with a Ruby script to fold the data for testing, etc. Here is the github repository. It took me a short while to get everything working together so hopefully this will save you several minutes of extra effort if you want to use SVM for text classification.

I recommend that you look through the github repo for my book to see what I cover and if it looks interesting please please consider buying my new book on leanpub . I cover a wide range of topics including machine learning, linked data, network programming techniques for IoT, and some ideas for knowledge management using cloud data.