code: def describeTopics(self, maxTermsPerTopic=None):
          
          if maxTermsPerTopic is None:
              topics = self.call("describeTopics")
          else:
              topics = self.call("describeTopics", maxTermsPerTopic)
          return topics
docs: Return the topics described by weighted terms.
  
          WARNING: If vocabSize and k are large, this can return a large object!
  
          :param maxTermsPerTopic:
            Maximum number of terms to collect for each topic.
            (default: vocabulary size)
          :return:
            Array over topics. Each topic is represented as a pair of
            matching arrays: (term indices, term weights in topic).
            Each topic's terms are sorted in order of decreasing weight.