C++ (Cpp) beliefF Examples

Example #1

File: trwbp.cpp Project: DerThorsten/libdai

// This code has been copied from bp.cpp, except where comments indicate TRWBP-specific behaviour
Real TRWBP::logZ() const {
    Real sum = 0.0;
    for( size_t I = 0; I < nrFactors(); I++ ) {
        sum += (beliefF(I) * factor(I).log(true)).sum();  // TRWBP/FBP
        sum += Weight(I) * beliefF(I).entropy();  // TRWBP/FBP
    }
    for( size_t i = 0; i < nrVars(); ++i ) {
        Real c_i = 0.0;
        bforeach( const Neighbor &I, nbV(i) )
            c_i += Weight(I);
        if( c_i != 1.0 )
            sum += (1.0 - c_i) * beliefV(i).entropy();  // TRWBP/FBP
    }
    return sum;
}

Example #2

File: exactinf.cpp Project: alucchi/structured_prediction_for_segmentation

Factor ExactInf::belief( const VarSet &ns ) const {
    if( ns.size() == 0 )
        return Factor();
    else if( ns.size() == 1 ) {
        return beliefV( findVar( *(ns.begin()) ) );
    } else {
        size_t I;
        for( I = 0; I < nrFactors(); I++ )
            if( factor(I).vars() >> ns )
                break;
        if( I == nrFactors() )
            DAI_THROW(BELIEF_NOT_AVAILABLE);
        return beliefF(I).marginal(ns);
    }
}