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Abstract
Given the abundance and ease of access of personal data today, individual
privacy has become of paramount importance, particularly in the healthcare
domain. In this work, we aim to utilise patient data extracted from multiple
hospital data centres to train a machine learning model without sacrificing
patient privacy. We develop a scheduling algorithm in conjunction with a
student-teacher algorithm that is deployed in a federated manner. This allows a
central model to learn from batches of data at each federal node. The teacher
acts between data centres to update the main task (student) algorithm using the
data that is stored in the various data centres. We show that the scheduler,
trained using meta-gradients, can effectively organise training and as a result
train a machine learning model on a diverse dataset without needing explicit
access to the patient data. We achieve state-of-the-art performance and show
how our method overcomes some of the problems faced in the federated learning
such as node poisoning. We further show how the scheduler can be used as a
mechanism for transfer learning, allowing different teachers to work together
in training a student for state-of-the-art performance.