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Title: Role-Wise Data Augmentation for Knowledge Distillation

Paper content:
Knowledge Distillation (KD) is a common method for transferring the ``knowledge'' learned by one machine learning model (the teacher) into another model (the student), where typically, the teacher has a greater capacity (e.g., more parameters or higher bit-widths).
To our knowledge, existing methods overlook the fact that although the student absorbs extra knowledge from the teacher, both models share the same input data -- and this data is the only medium by which the teacher's knowledge can be demonstrated.
Due to the difference in model capacities, the student may not benefit fully from the same data points on which the teacher is trained.
On the other hand, a human teacher may demonstrate a piece of knowledge with individualized examples adapted to a particular student, for instance, in terms of her cultural background and interests.
Inspired by this behavior, we design data augmentation agents with distinct roles to facilitate knowledge distillation.
Our data augmentation agents generate distinct training data for the teacher and student, respectively.
We focus specifically on KD when the teacher network has greater precision (bit-width) than the student network.
We find empirically that specially tailored data points enable the teacher's knowledge to be demonstrated more effectively to the student.
We compare our approach with existing KD methods on training popular neural architectures and demonstrate that role-wise data augmentation improves the effectiveness of KD over strong prior approaches.
The code for reproducing our results will be made publicly available.
Background and Motivation.
In the educational psychology literature, it is generally considered beneficial if teachers can adapt curricula based upon students' prior experiences (Bandura, 2002; Brumfiel, 2005; Gurlitt et al., 2006; Slotta & Chi, 2006) .
These vary widely depending on students' cultural backgrounds, previous educational experiences, interests, and motivations.
To help students with different prior experiences to comprehend, memorise, and consolidate a piece of knowledge, teachers may provide extra and customized teaching material during their teaching processes.
For instance, when teaching the concept of the color pink, a teacher may choose flamingos, sakura (cherry blossoms), or ice cream cones as the example, depending on a student's background.
Knowledge distillation (KD) (Bucilua et al., 2006; Hinton et al., 2014 ) is a common framework for training machine learning models.
It works by transferring knowledge from a higher-capacity teacher model to a lower-capacity student model.
Most KD methods can be categorized by how they define the knowledge stored in the teacher (i.e., the "soft targets" of training as defined in existing literature).
For instance, Hinton et al. (2014) originally proposed KD for neural networks, and they define the output class probabilities (i.e., soft labels) generated by the teacher as the targets for assisting the training of students.
In a follow up work, Romero et al. (2015) defined the soft targets via the feature maps in the teacher model's hidden layers.
To train a student network with KD effectively, it is important to distill as much knowledge from the teacher as possible.
However, previous methods overlook the importance of the medium by which the teacher's knowledge is demonstrated: the training data points.
We conjecture that there exist examples, not necessarily seen and ingested by the teacher, that might make it easier for the student to absorb the teacher's knowledge.
Blindly adding more training examples may not be beneficial because it may slow down training and introduce unnecessary biases (Ho et al., 2019) .
The analogy with how human teachers adjust their teaching to their students' particular situations (e.g., with the feedback gathered from the students during teaching) suggests that a reasonable yet uninvestigated approach might be to augment the training data for both the teacher and student according to distinct policies.
In this paper, we study whether and how adaptive data augmentation and knowledge distillation can be leveraged synergistically to better train student networks.
We propose a two-stage, rolewise data augmentation process for KD.
This process consists of: (1) training a teacher network till convergence while learning a schedule of policies to augment the training data specifically for the teacher; (2) distilling the knowledge from the teacher into a student network while learning another schedule of policies to augment the training data specifically for the student.
It is worth noting that this two-stage framework is orthogonal to existing methods for KD, which focus on how the knowledge to be distilled is defined; thus, our approach can be combined with previous methods straighforwardly.
Although our proposed method can in principle be applied to any models trained via KD, we focus specifically on how to use it to transfer the knowledge from a full-precision teacher network into a student network with lower bit-width.
Network quantization is crucial when deploying trained models on embedded devices, or in data centers to reduce energy consumption (Strubell et al., 2019) .
KD-based quantization (Zhuang et al., 2018; Polino et al., 2018) jointly trains a full-precision model, which acts as the teacher, alongside a low-precision model, which acts as the student.
Previous work has shown that distilling a full-precision teacher's knowledge into a low-precision student, followed by fine-tuning, incurs noticeable performance degradation, especially when the bit-widths are below four (Zhuang et al., 2018; Polino et al., 2018) .
We show that it is advantageous to use adaptive data augmentation to generate more training data for the low-precision network based on its specific weaknesses.
For example, low-precision networks may have difficulties learning rotationrelated patterns, 1 and the data augmentation agent should be aware of this and generate more such data points.
One positive side-effect for demonstrating the effectiveness of our method is that the improvement brought by our proposed method is more significant compared to the experiments on all full-precision models.

assistant: text: We study whether and how adaptive data augmentation and knowledge distillation can be leveraged simultaneously in a synergistic manner for better training student networks.