com.gregdennis.drej
Class Representer

java.lang.Object
  com.gregdennis.drej.Representer

All Implemented Interfaces:

Function

public final class Representer
extends java.lang.Object
implements Function

A representer function with a kernel K(x1, x2), a set of training data points (d1, d2, …, dn), and a vector (c1, c2, …, cn) of coefficients.

ƒ(x) = ∑ c_iK(d_i, x)

Author:

Greg Dennis (gdennis@mit.edu)

Constructor Summary

Representer(Kernel kernel, GMatrix data, GVector coeffs)
Constructs a new representer with the specified kernel, data matrix, and coefficients.

Method Summary

GVector	coeffs() Returns a copy of the vector of coefficients.
double	eval(GVector x) Evaluates the function at the specified point.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Representer

public Representer(Kernel kernel,
                   GMatrix data,
                   GVector coeffs)

Constructs a new representer with the specified kernel, data matrix, and coefficients. The data matrix is expected to contain one data point in each column.

Throws:

MismatchedSizeException - if number of data columns differs from number of coefficients.

Method Detail

coeffs

public GVector coeffs()

Returns a copy of the vector of coefficients.

eval

public double eval(GVector x)

Description copied from interface: Function

Evaluates the function at the specified point.

Specified by:

eval in interface Function