Personalized Federated Deep Learning for Pain Estimation From Face Images

• URL: http://arxiv.org/abs/2101.04800v1
• Date: Tue, 12 Jan 2021 23:21:25 GMT
• Title: Personalized Federated Deep Learning for Pain Estimation From Face Images
• Authors: Ognjen Rudovic, Nicolas Tobis, Sebastian Kaltwang, Bj\"orn Schuller, Daniel Rueckert, Jeffrey F. Cohn and Rosalind W. Picard
• Abstract summary: We propose a novel Personalized Deep Learning (PFDL) approach for pain estimation from face images. PFDL performs collaborative training of a deep model, implemented using a lightweight CNN architecture, across different clients without sharing their face images. We show that PFDL performs comparably or better than the standard centralized and FL algorithms, while further enhancing data privacy.
• Score: 31.890455005028706
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Standard machine learning approaches require centralizing the users' data in one computer or a shared database, which raises data privacy and confidentiality concerns. Therefore, limiting central access is important, especially in healthcare settings, where data regulations are strict. A potential approach to tackling this is Federated Learning (FL), which enables multiple parties to collaboratively learn a shared prediction model by using parameters of locally trained models while keeping raw training data locally. In the context of AI-assisted pain-monitoring, we wish to enable confidentiality-preserving and unobtrusive pain estimation for long-term pain-monitoring and reduce the burden on the nursing staff who perform frequent routine check-ups. To this end, we propose a novel Personalized Federated Deep Learning (PFDL) approach for pain estimation from face images. PFDL performs collaborative training of a deep model, implemented using a lightweight CNN architecture, across different clients (i.e., subjects) without sharing their face images. Instead of sharing all parameters of the model, as in standard FL, PFDL retains the last layer locally (used to personalize the pain estimates). This (i) adds another layer of data confidentiality, making it difficult for an adversary to infer pain levels of the target subject, while (ii) personalizing the pain estimation to each subject through local parameter tuning. We show using a publicly available dataset of face videos of pain (UNBC-McMaster Shoulder Pain Database), that PFDL performs comparably or better than the standard centralized and FL algorithms, while further enhancing data privacy. This, has the potential to improve traditional pain monitoring by making it more secure, computationally efficient, and scalable to a large number of individuals (e.g., for in-home pain monitoring), providing timely and unobtrusive pain measurement.

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