@article {18543, title = {Model Complexity, Regularization, and Sparsity [Guest Editorial]}, year = {2016}, keywords = {Adaptation models, Computational complexity, machine learning, Sparse matrices, Special issues and sections}, doi = {10.1109/MCI.2016.2602071}, author = {Alippi, Cesare and Boracchi, Giacomo and Wohlberg, Brendt} }