title: Classify a sentence into multiple categories
body: <p>A beginner in NLTK and Scikit-learn here. I want to be able to classify a given sentence(or even a paragraph) into a group of categories. By categories, I don't mean only two categories like spam and not spam or good sentiment and bad sentiment, meaning its multiple(more than two) categories to choose from. Please help me in choosing the simplest algorithm for solving this problem. Thanks in advance.</p>