code: def output(self):
          
          return luigi.contrib.hdfs.HdfsTarget('data-matrix', format=luigi.format.Gzip)
docs: Returns the target output for this task.
          In this case, a successful execution of this task will create a file in HDFS.
  
          :return: the target output for this task.
          :rtype: object (:py:class:`~luigi.target.Target`)