L1_penalty_options()
# [1] "lasso" "ols" "mcp" "elastic.net" "scad"
# [6] "mcp.net" "scad.net" "grp.lasso" "grp.lasso.net" "grp.mcp"
# [11] "grp.scad" "grp.mcp.net" "grp.scad.net" "sparse.grp.lasso"
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