bfunc: Compute upper bound of second derivative of loss

Description

Compute upper bound of second derivative of loss.

Usage

1

Arguments

family

a family from "closs", "gloss", "qloss" for classification and "clossR" for robust regression.

s

a parameter related to robustness.

Details

A finite upper bound is required in quadratic majorization.

Value

A positive number.

Author(s)

Zhu Wang


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