been made to apply DL as a mature learning technology on 11 graph-structured data from social, biological, and financial 12 domains. Graph Neural Networks (GNNs) have emerged as 13 a promising approach for representation learning on relational 14 data [3]-[6]. They were introduced as a generalization of the 15 convolutional operator from regular grids to graph-structured 16 data [7]. GNNs have shown remarkable success for relational 17 reasoning over graph-structured representations [8], [9].

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An electronic health record (EHR) is a vital high-dimensional part of medical concepts. Discovering implicit correlations in the information of this data set and the research and informative aspects can improve the treatment and management process. The challenge of concern is the data sources’ limitations in finding a stable model to relate medical concepts and use these existing connections. This paper presents Patient Forest, a novel end-to-end approach for learning patient representations from tree-structured data for readmission and mortality prediction tasks. By leveraging statistical features, the proposed model is able to provide an accurate and reliable classifier for predicting readmission and mortality. Experiments on MIMIC-III and eICU datasets demonstrate Patient Forest outperforms existing machine learning models, especially when the training data are limited. Additionally, a qualitative evaluation of Patient Forest is conducted by visualising the learnt representations in 2D space using the t-SNE, which further confirms the effectiveness of the proposed model in learning EHR representations.