Sentiment Polarity

I’ve begun learning ruby for my new job, a language that doesn’t seem to have really gotten any traction in the NLP community (at least not that I’ve heard).  I had been using python for my NLP stuff (homework and projects) and Java for my recommender system stuff.  In retrospect, I could have used python for the recommender stuff, but I wasn’t aware of some speed-ups so resorted to Java.  Of course, the recommender stuff isn’t strictly NLP.  Ruby is just as well suited as python and seems a lot better than Java for many tasks (though Java certainly has its place).  At the very least, a scripting language like ruby or python is great for prototyping.  It’s easy to test new ideas quickly. I was reading through Pang et al (2002), which deals with classifying movie reviews as positive or negative.  They look at three machine learning approaches:   Naive Bayes , Maximum Entropy classifier and Support Vect...