With the ever-increasing use of Internet and social networks that generate a vast amount of information, there is a serious need for recommendation systems. In this article, we propose a recommender system utilizing deep neural networks that simultaneously considers both the users' ratings to the movies and the visual features of the movie poster and trailer. For this purpose, a hybrid movie recommender system, RSLC-Net, has been developed using CNN and LSTM architectures. The proposed system considers the dynamics of users' interests in the collaborative filtering engine using the LSTM network that receives user-rating sequences. In the content-based filtering engine, utilizing CNN, the visual features of movie posters and trailers are extracted, and along with the actors and the directors, similar movies are recommended to the user. Moreover, each user's social influence is calculated employing the social information available on the user's Twitter account and used in the average movie rating to improve the effectiveness of the content-based filtering part. The required datasets have been collected from MovieTweetings, Mise-en-scène, and OMDB. The evaluation results show that the accuracy and effectiveness of the proposed approach have been improved in terms of MAE and RMSE compared to the best available methods.
The number of youth seeking mental health services has been increasing in the past decade. Accurate prediction of hospital readmission is a contributing factor in addressing youth mental health problem and healthcare service utilization. Medical records are an important source of information for readmission prediction, however utilizing such records in the context of mental care, requires overcoming two impeding challenges: the diversity of service utilization (e.g., using psychiatric vs. overdose vs. trauma clinics all for the same underlying mental health reason) and the heterogeneity of data associated with each service. Graph Neural Network (GNN) is shown to be promising in performing classification or regression tasks when input data bears a complex structure. In this research, we propose using graph embedding to first generate patient graph that captures episodic emergency department visits and the complex service utilizations of the patient. We then use GNN for readmission prediction. For embedding and training purposes, we utilize more than 4,000 unique mental health patients data over 19 years. To evaluate our approach we systematically compare a variety of of GNN models with four RNN models, namely LSTM, Bi-LSTM, GRU, and Bi-GRU. Our experimental evaluation demonstrates that encoding the complex interrelationship between features of a patient using graph embedding and GNN improves the performance of the predictive model compared to RNN counterparts.
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