Knowledge Distillation (KD) is one proposed solution to large model sizes and slow inference speed in semantic segmentation. In our research we identify 25 proposed distillation loss terms from 14 publications in the last 4 years. Unfortunately, a comparison of terms based on published results is often impossible, because of differences in training configurations. A good illustration of this problem is the comparison of two publications from 2022. Using the same models and dataset, Structural and Statistical Texture Distillation (SSTKD) reports an increase of student mIoU of 4.54 and a final performance of 29.19, while Adaptive Perspective Distillation (APD) only improves student performance by 2.06 percentage points, but achieves a final performance of 39.25. The reason for such extreme differences is often a suboptimal choice of hyperparameters and a resulting underperformance of the student model used as reference point. In our work, we reveal problems of insufficient hyperparameter tuning by showing that distillation improvements of two widely accepted frameworks, SKD and IFVD, vanish when hyperparameters are optimized sufficiently. To improve comparability of future research in the field, we establish a solid baseline for three datasets and two student models and provide extensive information on hyperparameter tuning. We find that only two out of eight techniques can compete with our simple baseline on the ADE20K dataset.

知识蒸馏可解决语义分割中的大型模型和慢速推理问题。研究中鉴定了14篇发表于近4年的25种蒸馏损失项。通过对2022年两篇论文的比较，揭示了超参数选择不当导致学生模型性能极端差异的问题。为了提高该领域的未来研究可比性，建立了三个数据集和两种学生模型的坚实基线，并提供了大量有关超参数调整的信息。在ADE20K数据集上，发现只有两种技术能与我们简单的基线相竞争。

走向语义图像分割中的可比较知识蒸馏