code: def collect(self, dataset_readers_list):
          
  
          ret = [ ]
          for i, collector in enumerate(self.components):
              report = ProgressReport(name='collecting results', done=(i + 1), total=len(self.components))
              alphatwirl.progressbar.report_progress(report)
              ret.append(collector.collect([(dataset, tuple(r.readers[i] for r in readerComposites))
                                            for dataset, readerComposites in dataset_readers_list]))
          return ret
docs: collect results
  
  
          Returns:
              a list of results