private String[] getTopicInfo(int topicId) {
        return getStringArrayEntry(user(0) + topicId, 2);
    }
Returns the topic and vector strings from the internal meta
data structure.
@param topicId Topic start index in a two-dimensional array
@return topic string at [0] and vector string at [1]
fsa/src/main/java/com/yahoo/fsa/topicpredictor/TopicPredictor.java