```// Copyright (C) 2010  Davis E. King (davis@dlib.net)
#undef DLIB_SIMPLIFY_LINEAR_DECiSION_FUNCTION_ABSTRACT_Hh_
#ifdef DLIB_SIMPLIFY_LINEAR_DECiSION_FUNCTION_ABSTRACT_Hh_

#include "../algs.h"
#include "function_abstract.h"
#include "sparse_kernel_abstract.h"
#include "kernel_abstract.h"

namespace dlib
{

// ----------------------------------------------------------------------------------------

template <
typename T
>
decision_function<sparse_linear_kernel<T> > simplify_linear_decision_function (
const decision_function<sparse_linear_kernel<T> >& df
);
/*!
requires
- T must be a sparse vector as defined in dlib/svm/sparse_vector_abstract.h
ensures
- returns a simplified version of df that only has one basis vector.  That
is, returns a decision function D such that:
- D.basis_vectors.size() == 1 (or 0 if df is empty)
- for all possible x: D(x) == df(x)
!*/

// ----------------------------------------------------------------------------------------

template <
typename T
>
decision_function<linear_kernel<T> > simplify_linear_decision_function (
const decision_function<linear_kernel<T> >& df
);
/*!
requires
- T must be a dlib::matrix object
ensures
- returns a simplified version of df that only has one basis vector.  That
is, returns a decision function D such that:
- D.basis_vectors.size() == 1 (or 0 if df is empty)
- for all possible x: D(x) == df(x)
!*/

// ----------------------------------------------------------------------------------------

template <
typename T
>
decision_function<linear_kernel<T> > simplify_linear_decision_function (
const normalized_function<decision_function<linear_kernel<T> >, vector_normalizer<T> >& df
);
/*!
requires
- T must be a dlib::matrix object
ensures
- returns a simplified version of df that only has one basis vector and
doesn't involve an explicit vector_normalizer.  That is, returns a
decision function D such that:
- D.basis_vectors.size() == 1 (or 0 if df is empty)
- for all possible x: D(x) == df(x)
!*/

// ----------------------------------------------------------------------------------------

}

#endif // DLIB_SIMPLIFY_LINEAR_DECiSION_FUNCTION_ABSTRACT_Hh_

```