docs: def main():
      """ Small run usage exemple
      """
      #TODO: need to be mv in .rst doc
      from reliure.pipeline import Composable
      @Composable
      def doc_analyse(docs):
         for doc in docs:
              yield {
                  "title": doc,
                  "url": "http://lost.com/%s" % doc,
              }
  
      @Composable
      def print_ulrs(docs):
          for doc in docs:
              print(doc["url"])
              yield doc
  
      pipeline = doc_analyse | print_ulrs
  
      documents = ("doc_%s" % d for d in xrange(20))
      res = run_parallel(pipeline, documents, ncpu=2, chunksize=5)
      print(res)