## Arbitrary-norm separating plane.(English)Zbl 1028.90037

Summary: A plane separating two point sets in $$n$$-dimensional real space is constructed such that it minimizes the sum of arbitrary-norm distances of misclassified points to the plane. In contrast to previous approaches that used surrogates for distance-minimization, the present work is based on a precise norm-dependent explicit closed form for the projection of a point on a plane. This projection is used to formulate the separating-plane problem as a minimization of a convex function on a unit sphere in a norm dual to that of the arbitrary norm used. For the 1-norm, the problem can be solved in polynomial time by solving $$2n$$ linear programs or by solving a bilinear program. For a general $$p$$-norm, the minimization problem can be transformed via an exact penalty formulation to minimizing the sum of a convex function and a bilinear function on a convex set. For the one and infinity norms, a finite successive linearization algorithm can be used for solving the exact penalty formulation.

### MSC:

 90C25 Convex programming 49M37 Numerical methods based on nonlinear programming 90C90 Applications of mathematical programming
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### References:

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