public List<PredictedTopic> getPredictedTopics(String segment) {
        return getPredictedTopics(segment, 0);
    }
Returns a list of PredictedTopic objects, one for each topic
the segment maps to. The returned list contains all topics,
as opposed to the two-argument version.
@param segment   The segment string to find (all) topics for.
@return (Linked)List of PredictedTopic objects.
fsa/src/main/java/com/yahoo/fsa/topicpredictor/TopicPredictor.java