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/**
\file freeze_param.hpp
*/
#ifndef FREEZE_PARAM_HPP
#define FREEZE_PARAM_HPP
#define OPT_HEADER
#include "fitter.hpp"
#include <vector>
#include <set>
#include <algorithm>
namespace opt_utilities
{
/**
freeze a set of parameter in model fitting
\tparam Ty the return type of a model
\tparam Tx the type of the self-var
\tparam Tp the type of the model parameter
\tparam Tstr the type of string used
*/
template <typename Ty,typename Tx,typename Tp,typename Tstr=std::string>
class freeze_param
:public param_modifier<Ty,Tx,Tp,Tstr>
{
private:
std::set<Tstr> param_names;
std::vector<size_t> param_num;
size_t num_free;
public:
/**
the default construct function
*/
freeze_param()
{
}
/**
construct function
\param name the name of the parameter to be frozen
*/
freeze_param(const Tstr& name)
{
param_names.insert(name);
}
private:
freeze_param<Ty,Tx,Tp,Tstr>* do_clone()const
{
return new freeze_param<Ty,Tx,Tp,Tstr>(*this);
}
/**
update the parameter information
should be called by the library, rather than the user
*/
void update()
{
param_num.clear();
for(typename std::set<Tstr>::const_iterator i=param_names.begin();
i!=param_names.end();++i)
{
try
{
param_num.push_back(this->get_model().get_param_order(*i));
}
catch(opt_exception& e)
{
param_names.erase(*i);
throw;
}
}
}
size_t do_get_num_free_params()const
{
return this->get_model().get_num_params()-param_num.size();
}
bool is_frozen(size_t i)const
{
if(std::find(param_num.begin(),param_num.end(),i)==param_num.end())
{
return false;
}
return true;
}
Tp do_reform(const Tp& p)const
{
size_t nparams=(this->get_model().get_num_params());
Tp reformed_p(nparams);
size_t i=0,j=0;
for(i=0;i<nparams;++i)
{
if(this->is_frozen(i))
{
const param_info<Tp,Tstr>& pinf=this->get_model().get_param_info(i);
//std::cout<<"frozen:"<<pinf.get_name()
// <<i<<"\t"<<j
// <<std::endl;
//opt_eq(get_element(reformed_p,i),pinf.get_value());
set_element(reformed_p,i,pinf.get_value());
}
else
{
//opt_eq(get_element(reformed_p,i),get_element(p,j));
set_element(reformed_p,i,get_element(p,j));
j++;
}
}
/*
for(int i=0;i<reformed_p.size();++i)
{
std::cout<<get_element(reformed_p,i)<<",";
}
*/
//std::cout<<"\n";
return reformed_p;
// return p;
}
Tp do_deform(const Tp& p)const
{
Tp deformed_p(do_get_num_free_params());
size_t i(0),j(0);
assert(get_size(p)==this->get_model().get_num_params());
for(;i<get_size(p);++i)
{
//std::cout<<is_frozen(j)<<"\n";
if(!this->is_frozen(i))
{
//opt_eq(get_element(deformed_p,j),get_element(p,i));
set_element(deformed_p,j,get_element(p,i));
j++;
}
}
assert(j==do_get_num_free_params());
return deformed_p;
}
Tstr do_report_param_status(const Tstr& name)const
{
if(param_names.find(name)==param_names.end())
{
return "thawed";
}
return "frozen";
}
public:
/**
plus operator, used to combine a list of freeze_param objects
\param fp another freeze_param object
\return the combined freeze_param object
*/
freeze_param operator+(const freeze_param& fp)const
{
freeze_param result(*this);
for(typename std::set<Tstr>::const_iterator i=fp.param_names.begin();
i!=fp.param_names.end();
++i)
{
result.param_names.insert(*i);
}
return result;
}
/**
+= operator
like the plus operator
*/
freeze_param& operator+=(const freeze_param& fp)
{
//param_names.insert(param_names.end(),
//fp.param_names.begin(),
//fp.param_names.end());
for(typename std::set<Tstr>::const_iterator i=fp.param_names.begin();
i!=fp.param_names.end();
++i)
{
param_names.insert(*i);
}
try
{
update();
}
catch(opt_exception& e)
{
throw;
}
return *this;
}
/**
un-freeze a parameter to a list of pre-frozen parameter list
\param fp the parameter to be un-frozen
\return the reference to the operated freeze_param object
*/
freeze_param& operator-=(const freeze_param& fp)
{
//param_names.insert(param_names.end(),
//fp.param_names.begin(),
//fp.param_names.end());
for(typename std::set<Tstr>::const_iterator i=fp.param_names.begin();
i!=fp.param_names.end();
++i)
{
param_names.erase(*i);
}
try
{
update();
}
catch(opt_exception& e)
{
throw;
}
return *this;
}
};
/**
help function to create a freeze_param object
\param name the name to be frozen
\return the created freeze_param object
*/
template <typename Ty,typename Tx,typename Tp,typename Tstr>
freeze_param<Ty,Tx,Tp,Tstr> freeze(const Tstr& name)
{
return freeze_param<Ty,Tx,Tp,Tstr>(name);
}
}
#endif
//EOF
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