Deep learning theory and applications : 4th International Conference DeLTA 2023 Rome Italy July 13 14 2023 proceedings This book consitiutes the refereed proceedings of the 4th International Conference on Deep Learning Theory and Applications DeLTA 2023 held in Rome Italy from 13 to 14 July 2023. The 9 full papers and 22 short papers presented were thoroughly reviewed and selected from the 42 qualified submissions. The scope of the conference includes such topics as models and algorithms; machine learning; big data analytics; computer vision applications; and natural language understanding