80 lines
2 KiB
C
80 lines
2 KiB
C
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 1997 - 1997
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//
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// File: utility.h
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//
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//--------------------------------------------------------------------------
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//
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// utility.h: Algorithms for computation of utility
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//
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#ifndef _UTILITY_H_
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#define _UTILITY_H_
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#include <deque>
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#include "gmobj.h"
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//////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////
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//
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// class MBNET_ENTROPIC_UTILITY:
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//
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// Ranking for entropic utility. Uses function object
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// semantics. Construct using an inference engine, since
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// utility calculations are computed w.r.t. a set of evidence.
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//
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//////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////
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struct UTILWORK
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{
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GNODEMBND * _pgndd; // Pointer to node
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int _iLbl; // Label of node
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MDVCPD _dd; // Unconditional distribution given evidence
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REAL _rUtil; // Utility
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int _iClamp; // index of clamped state or -1
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bool operator < ( const UTILWORK & ut ) const
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{ return _rUtil < ut._rUtil ; }
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};
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typedef deque<UTILWORK> DQUTILWORK;
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class MBNET_ENTROPIC_UTILITY : public MBNET_NODE_RANKER
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{
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public:
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MBNET_ENTROPIC_UTILITY ( GOBJMBN_INFER_ENGINE & inferEng );
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virtual ~ MBNET_ENTROPIC_UTILITY () {}
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INT EType () const
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{ return EBNO_RANKER_ENTROPIC_UTIL; }
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// The ranking function
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virtual void operator () ();
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protected:
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// The inference engine we're operating against
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GOBJMBN_INFER_ENGINE & _inferEng;
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// Property handler
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PROPMGR _propMgr;
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// Queue of work items
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DQUTILWORK _dquwrk;
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// Indicies of standard labels in this network
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int _iLblHypo;
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int _iLblInfo;
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int _iLblProblem;
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// Counts of nodes by label
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int _cHypo;
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int _cInfo;
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protected:
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void BuildWorkItems ();
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void ComputeWorkItems ();
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REAL RComputeHypoGivenInfo ( UTILWORK & uwHypo, UTILWORK & uwInfo );
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};
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#endif // _UTILITY_H_
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