void CBayesLearningEngine::Learn()
{
if(!m_pGrModel)
{
PNL_THROW( CNULLPointer, "no graphical model")
}
CStaticGraphicalModel *grmodel = this->GetStaticModel();
CFactor *factor = NULL;
int numberOfFactors = grmodel->GetNumberOfFactors();
int domainNodes;
if(m_numberOfLearnedEvidences == m_numberOfAllEvidences)
{
PNL_THROW(COutOfRange, "number of unlearned evidences must be positive")
}
int currentEvidNumber;
const CEvidence* pCurrentEvid;
//below code is intended to work on tabular CPD and gaussian CPD
//later we will generalize it for other distribution types
if ((grmodel->GetFactor(0))->GetDistributionType() == dtTabular)
{
for( int ev = m_numberOfLearnedEvidences; ev < m_numberOfAllEvidences; ev++)
{
currentEvidNumber = ev;
pCurrentEvid = m_Vector_pEvidences[currentEvidNumber];
if( !pCurrentEvid)
{
PNL_THROW(CNULLPointer, "evidence")
}
for( domainNodes = 0; domainNodes < numberOfFactors; domainNodes++ )
{
factor = grmodel->GetFactor( domainNodes );
int DomainSize;
const int *domain;
factor->GetDomain( &DomainSize, &domain );
const CEvidence *pEvidences[] = { pCurrentEvid };
CTabularDistribFun* pDistribFun = (CTabularDistribFun*)(factor->GetDistribFun());
pDistribFun->BayesUpdateFactor(pEvidences, 1, domain);
}
}
}
else
{
for( domainNodes = 0; domainNodes < numberOfFactors; domainNodes++ )
void CParEMLearningEngine::Learn()
{
CStaticGraphicalModel *pGrModel = this->GetStaticModel();
PNL_CHECK_IS_NULL_POINTER(pGrModel);
PNL_CHECK_LEFT_BORDER(GetNumEv() - GetNumberProcEv() , 1);
CJtreeInfEngine *pCurrentInfEng = NULL;
CFactor *parameter = NULL;
int exit = 0;
int numberOfParameters = pGrModel->GetNumberOfParameters();
int domainNodes;
int infIsNeed = 0;
int itsML = 0;
// !!!
float loglik = -FLT_MAX;
float loglikOld = -FLT_MAX;
float epsilon = GetPrecisionEM();
float stopExpression = epsilon + 1.0f;
int iteration = 0;
int currentEvidNumber;
int bMaximize = 0;
int bSumOnMixtureNode = 0;
const CEvidence* pCurrentEvid;
int start_mpi, finish_mpi;
int NumberOfProcesses, MyRank;
int numSelfEvidences;
MPI_Comm_size(MPI_COMM_WORLD, &NumberOfProcesses);
MPI_Comm_rank(MPI_COMM_WORLD, &MyRank);
int d = 0;
do
{
iteration++;
numSelfEvidences = (GetNumEv() - GetNumberProcEv()) / NumberOfProcesses;
start_mpi = GetNumberProcEv() + numSelfEvidences * MyRank; // !!!
if (MyRank < NumberOfProcesses - 1)
finish_mpi = start_mpi + numSelfEvidences; // !!!
else
finish_mpi = GetNumEv(); // !!!
for(int ev = start_mpi; ev < finish_mpi; ev++)
{
infIsNeed = 0;
currentEvidNumber = ev; // !!!
pCurrentEvid = m_Vector_pEvidences[currentEvidNumber];
if( !pCurrentEvid)
{
PNL_THROW(CNULLPointer, "evidence")
}
infIsNeed = !GetObsFlags(ev)->empty(); // !!!
if(infIsNeed)
{
// create inference engine
if(!pCurrentInfEng)
{
pCurrentInfEng = CJtreeInfEngine::Create(pGrModel);
}
pCurrentInfEng->EnterEvidence(pCurrentEvid, bMaximize,
bSumOnMixtureNode);
}
for(domainNodes = 0; domainNodes < numberOfParameters; domainNodes++)
{
parameter = pGrModel->GetFactor(domainNodes);
if(infIsNeed)
{
int DomainSize;
const int *domain;
parameter->GetDomain(&DomainSize, &domain);
if (IsDomainObserved(DomainSize, domain, currentEvidNumber))
{
const CEvidence *pEvidences[] = { pCurrentEvid };
parameter->UpdateStatisticsML(pEvidences, 1);
}
else
{
pCurrentInfEng->MarginalNodes(domain, DomainSize, 1);
const CPotential * pMargPot = pCurrentInfEng->GetQueryJPD();
parameter ->UpdateStatisticsEM(pMargPot, pCurrentEvid);
}
}
else
{
const CEvidence *pEvidences[] = { pCurrentEvid };
parameter->UpdateStatisticsML(pEvidences, 1);
}
}
itsML = itsML || !infIsNeed;
}
for(domainNodes = 0; domainNodes < numberOfParameters; domainNodes++ )
{
parameter = pGrModel->GetFactor(domainNodes);
CNumericDenseMatrix<float> *matForSending;
int matDim;
const int *pMatRanges;
int dataLength;
const float *pDataForSending;
matForSending = static_cast<CNumericDenseMatrix<float>*>
((parameter->GetDistribFun())->GetStatisticalMatrix(stMatTable));
matForSending->GetRanges(&matDim, &pMatRanges);
matForSending->GetRawData(&dataLength, &pDataForSending);
float *pDataRecv = new float[dataLength];
float *pDataRecv_copy = new float[dataLength];
MPI_Status status;
MPI_Allreduce((void*)pDataForSending, pDataRecv, dataLength, MPI_FLOAT, MPI_SUM,
MPI_COMM_WORLD);
CNumericDenseMatrix<float> *RecvMatrix =
static_cast<CNumericDenseMatrix<float>*>
(parameter->GetDistribFun()->GetStatisticalMatrix(stMatTable));
int dataLength_new;
float *pData_new;
RecvMatrix->GetRawData(&dataLength_new, (const float**)(&pData_new));
for(int t=0;t<dataLength_new;t++)
pData_new[t]=pDataRecv[t];
}
switch (pGrModel->GetModelType())
{
case mtBNet:
{
loglikOld = loglik;
loglik = 0.0f;
for(domainNodes = 0; domainNodes < numberOfParameters; domainNodes++)
{
parameter = pGrModel->GetFactor(domainNodes);
loglik += parameter->ProcessingStatisticalData(m_numberOfAllEvidences);
}
break;
}
case mtMRF2:
case mtMNet:
{
loglikOld = loglik;
loglik = _LearnPotentials();
break;
}
default:
{
PNL_THROW(CBadConst, "model type")
break;
}
}
stopExpression =
float(fabs(2 * (loglikOld - loglik) / (loglikOld + loglik)));
exit = ((stopExpression > epsilon) && (iteration <= GetMaxIterEM())) && !itsML;
if(exit)
{
ClearStatisticData();
}
delete pCurrentInfEng;
pCurrentInfEng = NULL;
}while(exit);
if(iteration > GetMaxIterEM())
{
PNL_THROW(CNotConverged, "maximum number of iterations")
}
SetNumProcEv( GetNumEv() );
}
void CParEMLearningEngine::LearnContMPI()
{
CStaticGraphicalModel *pGrModel = this->GetStaticModel();
PNL_CHECK_IS_NULL_POINTER(pGrModel);
PNL_CHECK_LEFT_BORDER(GetNumEv() - GetNumberProcEv() , 1);
CInfEngine *pInfEng = NULL;
pInfEng = CJtreeInfEngine::Create(pGrModel);
float loglik = 0.0f;
int domainNodes;
CFactor *parameter = NULL;
int numberOfParameters = pGrModel->GetNumberOfParameters();
int nFactors = pGrModel->GetNumberOfFactors();
const CEvidence *pEv;
CFactor *pFactor;
int iteration = 0;
int ev;
int i,numSelfEvidences,NumberOfProcesses, MyRank;
int start_mpi, finish_mpi;
MPI_Comm_size(MPI_COMM_WORLD, &NumberOfProcesses);
MPI_Comm_rank(MPI_COMM_WORLD, &MyRank);
if (IsAllObserved())
{
int i;
float **evid = NULL;
EDistributionType dt;
CFactor *factor = NULL;
for (i = 0; i < nFactors; i++)
{
factor = pGrModel->GetFactor(i);
factor->UpdateStatisticsML(&m_Vector_pEvidences[GetNumberProcEv()],
GetNumEv() - GetNumberProcEv());
}
m_critValue.push_back(UpdateModel());
}
else
{
bool bContinue;
const CPotential * pot;
do
{
ClearStatisticData();
iteration++;
numSelfEvidences = (GetNumEv() - GetNumberProcEv()) / NumberOfProcesses;
start_mpi = GetNumberProcEv() + numSelfEvidences * MyRank;
if (MyRank < NumberOfProcesses - 1)
finish_mpi = start_mpi + numSelfEvidences;
else
finish_mpi = GetNumEv();
for(int ev = start_mpi; ev < finish_mpi; ev++)
{
bool bInfIsNeed = !GetObsFlags(ev)->empty();
pEv = m_Vector_pEvidences[ev];
if( bInfIsNeed )
{
pInfEng->EnterEvidence(pEv, 0, 0);
}
int i;
for( i = 0; i < nFactors; i++ )
{
pFactor = pGrModel->GetFactor(i);
int nnodes;
const int * domain;
pFactor->GetDomain( &nnodes, &domain );
if( bInfIsNeed && !IsDomainObserved(nnodes, domain, ev ) )
{
pInfEng->MarginalNodes( domain, nnodes, 1 );
pot = pInfEng->GetQueryJPD();
pFactor->UpdateStatisticsEM( /*pInfEng->GetQueryJPD */ pot, pEv );
}
else
{
pFactor->UpdateStatisticsML( &pEv, 1 );
}
}
}
for(domainNodes = 0; domainNodes < numberOfParameters; domainNodes++ )
{
parameter = pGrModel->GetFactor(domainNodes);
C2DNumericDenseMatrix<float> *matMeanForSending;
C2DNumericDenseMatrix<float> *matCovForSending;
int dataLengthM,dataLengthC;
const float *pMeanDataForSending;
const float *pCovDataForSending;
matMeanForSending = static_cast<C2DNumericDenseMatrix<float>*>
((parameter->GetDistribFun())->GetStatisticalMatrix(stMatMu));
matMeanForSending->GetRawData(&dataLengthM, &pMeanDataForSending);
matCovForSending = static_cast<C2DNumericDenseMatrix<float>*>
((parameter->GetDistribFun())->GetStatisticalMatrix(stMatSigma));
matCovForSending->GetRawData(&dataLengthC, &pCovDataForSending);
float *pMeanDataRecv = new float[dataLengthM];
float *pCovDataRecv = new float[dataLengthC];
MPI_Status status;
MPI_Allreduce((void*)pMeanDataForSending, pMeanDataRecv, dataLengthM, MPI_FLOAT, MPI_SUM,
MPI_COMM_WORLD);
MPI_Allreduce((void*)pCovDataForSending, pCovDataRecv, dataLengthC, MPI_FLOAT, MPI_SUM,
MPI_COMM_WORLD);
memcpy((void*)pMeanDataForSending,pMeanDataRecv,dataLengthM*sizeof(float));
memcpy((void*)pCovDataForSending,pCovDataRecv,dataLengthC*sizeof(float));
}
loglik = UpdateModel();
if( GetMaxIterEM() != 1)
{
bool flag = iteration == 1 ? true :
(fabs(2*(m_critValue.back()-loglik)/(m_critValue.back() + loglik)) > GetPrecisionEM() );
bContinue = GetMaxIterEM() > iteration && flag;
}
else
{
bContinue = false;
}
m_critValue.push_back(loglik);
}while(bContinue);
}
SetNumProcEv( GetNumEv() );
}
CExInfEngine< INF_ENGINE, MODEL, FLAV, FALLBACK_ENGINE1, FALLBACK_ENGINE2 >::CExInfEngine( CStaticGraphicalModel const *gm )
: CInfEngine( itEx, gm ), evidence_mine( false ),
maximize( 0 ), MPE_ev( 0 ), query_JPD( 0 ), graphical_model( gm )
{
int i, j, k;
intVector dom;
intVector conv;
CFactor *fac;
PNL_MAKE_LOCAL( CGraph *, gr, gm, GetGraph() );
PNL_MAKE_LOCAL( int, sz, gr, GetNumberOfNodes() );
gr->GetConnectivityComponents( &decomposition );
for ( i = decomposition.size(); i--; )
{
std::sort( decomposition[i].begin(), decomposition[i].end() );
}
if ( PNL_IS_EXINFENGINEFLAVOUR_UNSORTED( FLAV ) )
{
gr->GetTopologicalOrder( &conv );
}
orig2comp.resize( sz );
orig2idx.resize( sz );
for ( k = 2; k--; )
{
for ( i = decomposition.size(); i--; )
{
for ( j = decomposition[i].size(); j--; )
{
orig2comp[decomposition[i][j]] = i;
orig2idx[decomposition[i][j]] = j;
}
}
if ( PNL_IS_EXINFENGINEFLAVOUR_UNSORTED( FLAV ) && k )
{
for ( i = sz; i--; )
{
decomposition[orig2comp[conv[i]]][orig2idx[conv[i]]] = i;
}
}
else
{
break;
}
}
graphs.resize( decomposition.size() );
models.resize( decomposition.size() );
engines.resize( decomposition.size() );
for ( i = decomposition.size(); i--; )
{
graphs[i] = gr->ExtractSubgraph( decomposition[i] );
#if 0
std::cout << "graph " << i << std::endl;
graphs[i]->Dump();
#endif
}
node_types.resize( decomposition.size() );
node_assoc.resize( decomposition.size() );
for ( i = 0, k = 0; i < decomposition.size(); ++i )
{
node_types[i].resize( decomposition[i].size() );
node_assoc[i].resize( decomposition[i].size() );
for ( j = 0; j < decomposition[i].size(); ++j )
{
node_types[i][j] = *gm->GetNodeType( decomposition[i][j] );
node_assoc[i][j] = j;
}
}
for ( i = decomposition.size(); i--; )
{
models[i] = MODEL::Create( decomposition[i].size(), node_types[i], node_assoc[i], graphs[i] );
}
for ( i = 0; i < gm->GetNumberOfFactors(); ++i )
{
fac = gm->GetFactor( i );
fac->GetDomain( &dom );
#if 0
std::cout << "Ex received orig factor" << std::endl;
fac->GetDistribFun()->Dump();
#endif
k = orig2comp[dom[0]];
for ( j = dom.size(); j--; )
{
dom[j] = orig2idx[dom[j]];
}
fac = CFactor::CopyWithNewDomain( fac, dom, models[k]->GetModelDomain() );
#if 0
std::cout << "Ex mangled it to" << std::endl;
fac->GetDistribFun()->Dump();
#endif
models[k]->AttachFactor( fac );
}
for ( i = decomposition.size(); i--; )
{
switch ( decomposition[i].size() )
{
case 1:
engines[i] = FALLBACK_ENGINE1::Create( models[i] );
continue;
case 2:
engines[i] = FALLBACK_ENGINE2::Create( models[i] );
continue;
default:
engines[i] = INF_ENGINE::Create( models[i] );
}
}
}
float CMlLearningEngine::_LearnPotentials()
{
int iteration = 1;
float log_lik = 0.0f;
CStaticGraphicalModel *grmodel = this->GetStaticModel();
CFactor *parameter = NULL;
float epsilon = m_precisionIPF;
const CPotential *joint_prob = NULL;
CPotential *clique_jpd = NULL;
CMatrix<float> *itogMatrix;
CInfEngine *m_pInfEngine =
CNaiveInfEngine::Create(grmodel);
intVector obsNodes(0);
valueVector obsValues(0);
CEvidence *emptyEvidence = CEvidence::Create(grmodel->GetModelDomain(), obsNodes, obsValues);
m_pInfEngine -> EnterEvidence( emptyEvidence );
int querySize = grmodel->GetNumberOfNodes();
int *query;
query = new int [querySize];
int i;
for( i = 0; i < querySize; i++ )
{
query[i] = i;
}
m_pInfEngine -> MarginalNodes( query, querySize );
joint_prob = m_pInfEngine->GetQueryJPD();
CPotential *itog_joint_prob =
static_cast<CPotential *>(joint_prob ->Marginalize(query, querySize));
int DomainSize;
const int *domain;
potsPVector learn_factors;
CPotential *tmp_factor;
for (i = 0; i < grmodel -> GetNumberOfFactors(); i++)
{
factor = grmodel -> GetFactor(i);
factor -> GetDomain( &DomainSize, &domain );
CDistribFun *correspData= factor -> GetDistribFun();
CMatrix<float> *learnMatrix = correspData ->
GetStatisticalMatrix(stMatTable);
CPotential *factor = CTabularPotential::Create( domain, DomainSize,
parameter->GetModelDomain());
learn_factors.push_back(factor);
learn_factors[i] -> AttachMatrix(learnMatrix->NormalizeAll(), matTable);
}
int data_length;
float *old_itog_data = NULL;
const float *itog_data;
delete [] query;
int convergence = 0;
while( !convergence && (iteration <= m_maxIterIPF))
{
iteration++;
itogMatrix = (itog_joint_prob->GetDistribFun())
-> GetMatrix(matTable);
static_cast<CNumericDenseMatrix<float>*>(itogMatrix)->
GetRawData(&data_length, &itog_data);
old_itog_data = new float[data_length];
for( i = 0; i < data_length; i++)
{
old_itog_data[i] = itog_data[i];
}
for( int clique = 0; clique < grmodel->GetNumberOfFactors(); clique++)
{
factor = grmodel -> GetFactor(clique);
factor -> GetDomain( &DomainSize, &domain );
clique_jpd = static_cast<CPotential *>
(itog_joint_prob -> Marginalize( domain, DomainSize ));
tmp_factor = itog_joint_prob -> Multiply(learn_factors[clique]);
delete (itog_joint_prob);
itog_joint_prob = tmp_factor;
tmp_factor = itog_joint_prob -> Divide(clique_jpd);
delete (itog_joint_prob);
delete (clique_jpd);
itog_joint_prob = tmp_factor;
}
itogMatrix = (itog_joint_prob->GetDistribFun())
-> GetMatrix(matTable);
static_cast<CNumericDenseMatrix<float>*>(itogMatrix)->
GetRawData(&data_length, &itog_data);
convergence = true;
for (int j = 0; j < data_length; j++)
{
if( fabs( itog_data[j] - old_itog_data[j] ) > epsilon)
{
convergence = false;
break;
}
}
delete []old_itog_data;
}
if(iteration > m_maxIterIPF)
{
PNL_THROW(CNotConverged,
"maximum number of iterations for IPF procedure")
}
for(int clique = 0; clique < grmodel -> GetNumberOfFactors(); clique++)
{
CMatrix<float> *matrix = NULL;
factor = grmodel -> GetFactor(clique);
int DomainSize;
const int *domain;
int data_length;
const float *data;
factor -> GetDomain( &DomainSize, &domain );
matrix = itog_joint_prob->Marginalize( domain, DomainSize )
->GetDistribFun()-> GetMatrix( matTable );
static_cast<CNumericDenseMatrix<float>*>(matrix)->GetRawData(&data_length, &data);
CNumericDenseMatrix<float>* matLearn =
static_cast<CNumericDenseMatrix<float>*>(
parameter->GetDistribFun()->GetStatisticalMatrix(stMatTable));
for(int offset = 0; offset < data_length; offset++)
{
float prob = float( ( data[offset] < FLT_EPSILON ) ? -FLT_MAX : log( data[offset] ) );
log_lik += matLearn->GetElementByOffset(offset)*prob -
m_Vector_pEvidences.size();
}
factor ->AttachMatrix(matrix, matTable);
delete (learn_factors[clique]);
}
delete (itog_joint_prob);
learn_factors.clear();
return log_lik;
}
