code: public Result getResult(boolean percentage)
      {
          float p = A_cap_B_size / (float) B_size;
          float r = A_cap_B_size / (float) A_size;
          if (percentage)
          {
              p *= 100;
              r *= 100;
          }
          float oov_r = Float.NaN;
          if (OOV > 0)
          {
              oov_r = OOV_R / (float) OOV;
              if (percentage)
                  oov_r *= 100;
          }
          float iv_r = Float.NaN;
          if (IV > 0)
          {
              iv_r = IV_R / (float) IV;
              if (percentage)
                  iv_r *= 100;
          }
          return new Result(p, r, 2 * p * r / (p + r), oov_r, iv_r);
      }
docs: 获取PRF
  
  @param percentage 百分制
  @return