GModel.hpp
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/***************************************************************************
* GModel.hpp - Abstract virtual model base class *
* ----------------------------------------------------------------------- *
* copyright (C) 2009-2014 by Juergen Knoedlseder *
* ----------------------------------------------------------------------- *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
* *
***************************************************************************/
/**
* @file GModel.hpp
* @brief Abstract model base class interface definition
* @author Juergen Knoedlseder
*/
#ifndef GMODEL_HPP
#define GMODEL_HPP
/* __ Includes ___________________________________________________________ */
#include <vector>
#include <string>
#include "GBase.hpp"
#include "GModelPar.hpp"
#include "GXmlElement.hpp"
#include "GEnergy.hpp"
#include "GTime.hpp"
/* __ Forward declarations _______________________________________________ */
class GEvent;
class GObservation;
/***********************************************************************//**
* @class GModel
*
* @brief Abstract model class
*
* This class implements a parametric model. The class has two methods for
* model evaluation: eval() and eval_gradients().
* The eval() method evaluates the model for a given event and observation.
* In addition, eval_gradients() also sets the parameter gradients of the
* model.
*
* A model has the following attributes:
* - @p name
* - @p type
* - @p instruments
* - @p ids
* - @p scales
*
* The model @p name is a text string that names the model. The name()
* methods allow setting and retrieving the model name. The model handling
* does not actual depend on the value of this text string.
*
* The model @p type is a text string that specifies the kind of the model.
* Examples are @p PointSource, @p ExtendedSource or @p DiffuseSource for
* sky models. The type() method allows retrieving the model type. The model
* handling does not actual depend on the value of this text string.
*
* The model @p instruments is a list of text strings that specifies the
* instruments to which the model applies. The is_valid() method will check
* a given instrument name against that list to verify if the model applies
* to an instrument. The instruments() method returns a comma separated
* list of all instruments. Another instance of this method allows setting
* the instrument list from a comma separated list. If the @p instruments
* list is empty, the model applies to all instruments.
*
* The model @p ids is a list of text strings that specifies the observation
* identifiers to which the model applies. This allows specifying of models
* for a specific list of observations. The is_valid() method will check
* a given observation identifier against that list to verify if the model
* applies. The ids() method returns a comma separated list of all
* observation identifiers. Another instance of this method allows setting
* the observation identifiers from a comma separated list. If the @p ids
* list is empty, the model applies to all observation identifiers.
*
* The model @p scales is a list of model parameters that specify an
* instrument dependent scaling factor. This allows to prescale a model for
* a given instrument. The scale() methods allow to set and to retrieve the
* scale factor for a specific instrument.
*
* As the class holds simply a collection of model parameters, it should
* neither deal with allocation and deallocation, nor with cloning of
* model parameters. This will be done by the classes that actually
* implement the model parameters.
***************************************************************************/
class GModel : public GBase {
public:
// Constructors and destructors
GModel(void);
explicit GModel(const GXmlElement& xml);
GModel(const GModel& model);
virtual ~GModel(void);
// Operators
virtual GModel& operator=(const GModel& model);
virtual GModelPar& operator[](const int& index);
virtual const GModelPar& operator[](const int& index) const;
virtual GModelPar& operator[](const std::string& name);
virtual const GModelPar& operator[](const std::string& name) const;
// Pure virtual methods
virtual void clear(void) = 0;
virtual GModel* clone(void) const = 0;
virtual std::string classname(void) const = 0;
virtual std::string type(void) const = 0;
virtual bool is_constant(void) const = 0;
virtual double eval(const GEvent& event,
const GObservation& obs) const = 0;
virtual double eval_gradients(const GEvent& event,
const GObservation& obs) const = 0;
virtual double npred(const GEnergy& obsEng, const GTime& obsTime,
const GObservation& obs) const = 0;
virtual void read(const GXmlElement& xml) = 0;
virtual void write(GXmlElement& xml) const = 0;
virtual std::string print(const GChatter& chatter = NORMAL) const = 0;
// Implemented methods
int size(void) const;
GModelPar& at(const int& index);
const GModelPar& at(const int& index) const;
bool has_par(const std::string& name) const;
bool has_scales(void) const;
const std::string& name(void) const;
void name(const std::string& name);
const double& ts(void) const;
void ts(const double& ts);
const bool& tscalc(void) const;
void tscalc(const bool& tscalc);
std::string instruments(void) const;
void instruments(const std::string& instruments);
GModelPar scale(const std::string& instrument) const;
void scale(const GModelPar& par);
std::string ids(void) const;
void ids(const std::string& ids);
bool is_valid(const std::string& instruments,
const std::string& ids) const;
protected:
// Protected methods
void init_members(void);
void copy_members(const GModel& model);
void free_members(void);
void read_scales(const GXmlElement& xml);
void write_scales(GXmlElement& xml) const;
std::string print_attributes(void) const;
// Protected members
std::string m_name; //!< Model name
std::vector<std::string> m_instruments; //!< Instruments to which model applies
std::vector<GModelPar> m_scales; //!< Model instrument scale factors
std::vector<std::string> m_ids; //!< Identifiers to which model applies
std::vector<GModelPar*> m_pars; //!< Pointers to all model parameters
bool m_has_ts; //!< Signals if TS is available
bool m_has_tscalc; //!< Signals if tscalc attribute is available
bool m_tscalc; //!< Signals if TS should be computed
double m_ts; //!< Test Statistic of the model
};
/***********************************************************************//**
* @brief Returns reference to model parameter by index
*
* @param[in] index Parameter index [0,...,size()-1].
* @return Reference to model parameter.
*
* Returns a reference to the model parameter of the specified @p index.
***************************************************************************/
inline
GModelPar& GModel::operator[](const int& index)
{
// Return reference
return *(m_pars[index]);
}
/***********************************************************************//**
* @brief Returns reference to model parameter by index (const version)
*
* @param[in] index Parameter index [0,...,size()-1].
* @return Const reference to model parameter.
*
* Returns a const reference to the model parameter of the specified
***************************************************************************/
inline
const GModelPar& GModel::operator[](const int& index) const
{
// Return reference
return *(m_pars[index]);
}
/***********************************************************************//**
* @brief Return number of parameters in model
*
* @return Number of parameters in model.
*
* Returns the number of parameters in the model.
***************************************************************************/
inline
int GModel::size(void) const
{
return (m_pars.size());
}
/***********************************************************************//**
* @brief Return parameter name
*
* @return Parameter name.
*
* Returns the parameter name.
***************************************************************************/
inline
const std::string& GModel::name(void) const
{
return m_name;
}
/***********************************************************************//**
* @brief Set parameter name
*
* @param[in] name Parameter name.
*
* Set the parameter name.
***************************************************************************/
inline
void GModel::name(const std::string& name)
{
m_name = name;
return;
}
/***********************************************************************//**
* @brief Return Test Statistic value
*
* @return Test Statistic value.
*
* Returns the Test Statistic value. The Test Statistic value is twice the
* difference between the log-likelihood of the null hypothesis and the
* alternative hypothesis.
***************************************************************************/
inline
const double& GModel::ts(void) const
{
return m_ts;
}
/***********************************************************************//**
* @brief Set Test Statistic value
*
* @param[in] ts Test Statistic value.
*
* Set the Test Statistic value. The Test Statistic value is twice the
* difference between the log-likelihood of the null hypothesis and the
* alternative hypothesis.
***************************************************************************/
inline
void GModel::ts(const double& ts)
{
m_ts = ts;
m_has_ts = true; //!< Signals that TS is now available
return;
}
/***********************************************************************//**
* @brief Return Test Statistic computation flag
*
* @return Test Statistic computation flag; true is Test Statistic should be
* computed.
*
* Returns the flag that signals whether Test Statistic values should be
* computed.
***************************************************************************/
inline
const bool& GModel::tscalc(void) const
{
return m_tscalc;
}
/***********************************************************************//**
* @brief Set Test Statistic computation flag
*
* @param[in] tscalc Test Statistic computation flag.
*
* Set the flag that signals whether Test Statistic values should be
* computed.
***************************************************************************/
inline
void GModel::tscalc(const bool& tscalc)
{
m_tscalc = tscalc;
m_has_tscalc = true; //!< Signals that tscalc is now available
return;
}
/***********************************************************************//**
* @brief Signals that model has scales
*
* @return True is model has scale factors.
***************************************************************************/
inline
bool GModel::has_scales(void) const
{
return (!m_scales.empty());
}
#endif /* GMODEL_HPP */