BroydenFletcherGoldfarbShannoOrthantwiseStart Property

public int OrthantwiseStart { get; set; }

Public Property OrthantwiseStart As Integer
	Get
	Set

Property Value

This parameter is valid only for OWL-QN method (i.e., OrthantwiseC != 0). This parameter b (0 <= b < N) specifies the index number from which the library computes the L1 norm of the variables x,

|x| := |x_{b}| + |x_{b+1}| + ... + |x_{N}|.

In other words, variables x_1, ..., x_{b-1} are not used for computing the L1 norm. Setting b (0 < b < N), one can protect variables, x_1, ..., x_{b-1} (e.g., a bias term of logistic regression) from being regularized. The default value is zero.

Reference