Deep learning theory and applications : Third International Conference DeLTA 2022 Lisbon Portugal July 12 14 2022 revised selected papers This book constitutes the refereed post conference proceedings of the Third International Conference on Deep Learning Theory and Applications DeLTA 2022 held in Lisbon Portugal during January 17 18 2022. The 6 full papers included in this book were carefully reviewed and selected from 36 submissions. They present recent research on machine learning and artificial intelligence in real world applications such as computer vision information retrieval and summarization from structured and unstructured multimodal data sources natural language understanding and translation and many other application domains