| 现有工作 | 同态加密 | 保护训练样本隐私 | 保护分类模型 | Householder变换 | 保护分类标签 |
| Lin [13] | × | √ | √ | × | × |
| Maekawa [22] | × | √ | √ | × | × |
| Wang [11] | √ | √ | √ | × | × |
| PPOSVM | × | × | × | √ | √ |