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In addition to the default FISTA solver (function proximalGradientSolverGroupSLOPE used by default within function grpSLOPE), an ADMM solver has been implemented for the Group SLOPE model (function admmSolverGroupSLOPE ).
Removes the dependency on the R package SLOPE, because the only two functions from SLOPE that are used in grpSLOPE are being deprecated and removed from SLOPE package versions newer than 0.1.3.
Since the dependency on the R package SLOPE has been removed (see above), the two functions SLOPE::SLOPE_solver and SLOPE::prox_sorted_L1 (including the underlying C implementation) have been adapted from SLOPE version 0.1.3 into this version of the grpSLOPE package.