Knowledge distillation is one of the most popular and effective techniques for knowledge transfer, model compression and semi-supervised learning. Most existing distillation approaches require the access to original or augmented training samples. But this can be problematic in practice due to privacy, proprietary and availability concerns. Recent work has put forward some methods to tackle this problem, but they are either highly time-consuming or unable to scale to large datasets. To this end, we propose a new method to train a generative image model by leveraging the intrinsic normalization layers' statistics of the trained teacher network. This enables us to build an ensemble of generators without training data that can efficiently produce substitute inputs for subsequent distillation. The proposed method pushes forward the data-free distillation performance on CIFAR-10 and CIFAR-100 to 95.02% and 77.02% respectively. Furthermore, we are able to scale it to ImageNet dataset, which to the best of our knowledge, has never been done using generative models in a data-free setting.

提出了一种新的方法，通过利用训练教师网络内在归一化层的统计信息来训练生成图像模型，从而在没有训练数据的情况下实现知识迁移、模型压缩和半监督学习，该方法在 CIFAR-10 和CIFAR-100 数据集上表现出色，并能够将其扩展到 ImageNet 数据集。

大规模生成无数据蒸馏