This book constitutes the proceedings of the First International Workshop on Continual Semi-Supervised Learning, CSSL 2021, which took place as a virtual event during August 2021.The 9 full papers and 0 short papers included in this book were carefully reviewed and selected from 14 submissions.

International Workshop on Continual Semi-Supervised Learning: Introduction, Benchmarks and Baselines.- Unsupervised Continual Learning Via Pseudo Labels.- Transfer and Continual Supervised Learning for Robotic Grasping through Grasping Features.- Unsupervised Continual Learning via Self-Adaptive Deep Clustering Approach.- Evaluating Continual Learning Algorithms by Generating 3D Virtual Environments.- A Benchmark and Empirical Analysis for Replay Methods in Continual Learning.- SPeCiaL: Self-Supervised Pretraining for Continual Learning.- Distilled Replay: Overcoming Forgetting through Synthetic Samples.- Self-supervised Novelty Detection for Continual Learning: A Gradient-based Approach Boosted by Binary Classification.

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