private Assignment doOnePass(FactorGraph mdl, Assignment initial) {
Assignment ret = (Assignment) initial.duplicate();
for (int vidx = 0; vidx < ret.size(); vidx++) {
Variable var = mdl.get(vidx);
DiscreteFactor subcpt = constructConditionalCpt(mdl, var, ret);
int value = subcpt.sampleLocation(r);
ret.setValue(var, value);
}
return ret;
}
// Warning: destructively modifies ret's assignment to fullAssn (I could save and restore, but I
// don't care
private DiscreteFactor constructConditionalCpt(
FactorGraph mdl, Variable var, Assignment fullAssn) {
List ptlList = mdl.allFactorsContaining(var);
LogTableFactor ptl = new LogTableFactor(var);
for (AssignmentIterator it = ptl.assignmentIterator(); it.hasNext(); it.advance()) {
Assignment varAssn = it.assignment();
fullAssn.setValue(var, varAssn.get(var));
ptl.setRawValue(varAssn, sumValues(ptlList, fullAssn));
}
ptl.normalize();
return ptl;
}