code: def evaluate(molecules, ensemble_chunk, sort_order, options, output_queue=None):
      
  
      results = {}    # {('receptor_1', ..., 'receptor_n') : ensemble storage object}
  
      for ensemble in ensemble_chunk:
          results[ensemble] = calculate_performance(molecules, ensemble, sort_order, options)
  
      if output_queue is not None:
          output_queue.put(results)
      else:
          return results
docs: Evaluate VS performance of each ensemble in ensemble_chunk