/// Writes a FactorGraph to an output stream
ostream& operator << (ostream& os, const FactorGraph& fg) {
os << fg.nrFactors() << endl;
for( size_t I = 0; I < fg.nrFactors(); I++ ) {
os << endl;
os << fg.factor(I).vars().size() << endl;
for( VarSet::const_iterator i = fg.factor(I).vars().begin(); i != fg.factor(I).vars().end(); i++ )
os << i->label() << " ";
os << endl;
for( VarSet::const_iterator i = fg.factor(I).vars().begin(); i != fg.factor(I).vars().end(); i++ )
os << i->states() << " ";
os << endl;
size_t nr_nonzeros = 0;
for( size_t k = 0; k < fg.factor(I).states(); k++ )
if( fg.factor(I)[k] != 0.0 )
nr_nonzeros++;
os << nr_nonzeros << endl;
for( size_t k = 0; k < fg.factor(I).states(); k++ )
if( fg.factor(I)[k] != 0.0 ) {
char buf[20];
sprintf(buf,"%18.14g", fg.factor(I)[k]);
os << k << " " << buf << endl;
}
}
return(os);
}
SharedParameters::SharedParameters( std::istream &is, const FactorGraph &fg )
: _varsets(), _perms(), _varorders(), _estimation(NULL), _ownEstimation(true)
{
// Read the desired parameter estimation method from the stream
std::string est_method;
PropertySet props;
is >> est_method;
is >> props;
// Construct a corresponding object
_estimation = ParameterEstimation::construct( est_method, props );
// Read in the factors that are to be estimated
size_t num_factors;
is >> num_factors;
for( size_t sp_i = 0; sp_i < num_factors; ++sp_i ) {
std::string line;
while( line.size() == 0 && getline(is, line) )
;
std::vector<std::string> fields;
tokenizeString(line, fields, " \t");
// Lookup the factor in the factorgraph
if( fields.size() < 1 )
DAI_THROWE(INVALID_EMALG_FILE,"Empty line unexpected");
std::istringstream iss;
iss.str( fields[0] );
size_t factor;
iss >> factor;
const VarSet &vs = fg.factor(factor).vars();
if( fields.size() != vs.size() + 1 )
DAI_THROWE(INVALID_EMALG_FILE,"Number of fields does not match factor size");
// Construct the vector of Vars
std::vector<Var> var_order;
var_order.reserve( vs.size() );
for( size_t fi = 1; fi < fields.size(); ++fi ) {
// Lookup a single variable by label
size_t label;
std::istringstream labelparse( fields[fi] );
labelparse >> label;
VarSet::const_iterator vsi = vs.begin();
for( ; vsi != vs.end(); ++vsi )
if( vsi->label() == label )
break;
if( vsi == vs.end() )
DAI_THROWE(INVALID_EMALG_FILE,"Specified variables do not match the factor variables");
var_order.push_back( *vsi );
}
_varorders[factor] = var_order;
}
// Calculate the necessary permutations
setPermsAndVarSetsFromVarOrders();
}
/// Writes a FactorGraph to an output stream
std::ostream& operator<< ( std::ostream &os, const FactorGraph &fg ) {
os << fg.nrFactors() << endl;
for( size_t I = 0; I < fg.nrFactors(); I++ ) {
os << endl;
os << fg.factor(I).vars().size() << endl;
for( VarSet::const_iterator i = fg.factor(I).vars().begin(); i != fg.factor(I).vars().end(); i++ )
os << i->label() << " ";
os << endl;
for( VarSet::const_iterator i = fg.factor(I).vars().begin(); i != fg.factor(I).vars().end(); i++ )
os << i->states() << " ";
os << endl;
size_t nr_nonzeros = 0;
for( size_t k = 0; k < fg.factor(I).nrStates(); k++ )
if( fg.factor(I)[k] != (Real)0 )
nr_nonzeros++;
os << nr_nonzeros << endl;
for( size_t k = 0; k < fg.factor(I).nrStates(); k++ )
if( fg.factor(I)[k] != (Real)0 )
os << k << " " << setw(os.precision()+4) << fg.factor(I)[k] << endl;
}
return(os);
}
int main( int argc, char *argv[] ) {
if( argc != 3 ) {
cout << "Usage: " << argv[0] << " <in.fg> <tw>" << endl << endl;
cout << "Reports some characteristics of the .fg network." << endl;
cout << "Also calculates treewidth (which may take some time) unless <tw> == 0." << endl;
return 1;
} else {
// Read factorgraph
FactorGraph fg;
char *infile = argv[1];
int calc_tw = atoi(argv[2]);
fg.ReadFromFile( infile );
cout << "Number of variables: " << fg.nrVars() << endl;
cout << "Number of factors: " << fg.nrFactors() << endl;
cout << "Connected: " << fg.isConnected() << endl;
cout << "Tree: " << fg.isTree() << endl;
cout << "Has short loops: " << hasShortLoops(fg.factors()) << endl;
cout << "Has negatives: " << hasNegatives(fg.factors()) << endl;
cout << "Binary variables? " << fg.isBinary() << endl;
cout << "Pairwise interactions? " << fg.isPairwise() << endl;
if( calc_tw ) {
std::pair<size_t,size_t> tw = treewidth(fg);
cout << "Treewidth: " << tw.first << endl;
cout << "Largest cluster for JTree has " << tw.second << " states " << endl;
}
double stsp = 1.0;
for( size_t i = 0; i < fg.nrVars(); i++ )
stsp *= fg.var(i).states();
cout << "Total state space: " << stsp << endl;
double cavsum_lcbp = 0.0;
double cavsum_lcbp2 = 0.0;
size_t max_Delta_size = 0;
map<size_t,size_t> cavsizes;
for( size_t i = 0; i < fg.nrVars(); i++ ) {
VarSet di = fg.delta(i);
if( cavsizes.count(di.size()) )
cavsizes[di.size()]++;
else
cavsizes[di.size()] = 1;
size_t Ds = fg.Delta(i).nrStates();
if( Ds > max_Delta_size )
max_Delta_size = Ds;
cavsum_lcbp += di.nrStates();
for( VarSet::const_iterator j = di.begin(); j != di.end(); j++ )
cavsum_lcbp2 += j->states();
}
cout << "Maximum pancake has " << max_Delta_size << " states" << endl;
cout << "LCBP with full cavities needs " << cavsum_lcbp << " BP runs" << endl;
cout << "LCBP with only pairinteractions needs " << cavsum_lcbp2 << " BP runs" << endl;
cout << "Cavity sizes: ";
for( map<size_t,size_t>::const_iterator it = cavsizes.begin(); it != cavsizes.end(); it++ )
cout << it->first << "(" << it->second << ") ";
cout << endl;
cout << "Type: " << (fg.isPairwise() ? "pairwise" : "higher order") << " interactions, " << (fg.isBinary() ? "binary" : "nonbinary") << " variables" << endl;
if( fg.isPairwise() ) {
bool girth_reached = false;
size_t loopdepth;
for( loopdepth = 2; loopdepth <= fg.nrVars() && !girth_reached; loopdepth++ ) {
size_t nr_loops = countLoops( fg, loopdepth );
cout << "Loops up to " << loopdepth << " variables: " << nr_loops << endl;
if( nr_loops > 0 )
girth_reached = true;
}
if( girth_reached )
cout << "Girth: " << loopdepth-1 << endl;
else
cout << "Girth: infinity" << endl;
}
return 0;
}
}
