docs: def result_sort_key(response_item):
      """
      The sort key function for the search results
      Input:
          response_item: the tuple of (code, snippet)
      output:
          sortable value, the greatest first
      """
      code, snippet = response_item
  
      snippet_length = len(snippet)
      freq = search_freq.get(code, 0)
      beta = 0.05
      score = math.log(freq * 0.05 + 1) / (snippet_length + 1)
  
      return score