Software Features# 1. Various Iterative-Algorithms Support 1.1. Implemented Solvers 1.2. Reference 2. Variants of Sparsity-Constraint Optimization 2.1. Group-structured parameters 2.2. Preselected Non-sparse Parameters 2.3. Layers 2.4. Flexible Optimization Interface 2.5. Reference 3. Features for Data Science 3.1. Data-dependence Objective Function 3.2. Optimal Support Size Searching 3.2.1. Information Criterion 3.2.2. Cross Validation 3.3. Reference 4. Computational Tips 4.1. Just In Time Compilation