rsesreducts.cpp

粗慥集成算法集合 ,并有详细的文档资料和测试数据处

		Handle<Structure> child = GetChild(j);

		// Make sure it's a RSES rule set.
		if (!child->IsA(RSESRULES))
			continue;

		Handle<RSESRules> rules = dynamic_cast(RSESRules *, child.GetPointer());

		// Check that the embedded TRedRulMem objects are the same.
		if (rules->rules_ != reducts_)
			continue;

		// Remove all rules.
		if (!rules->RemoveAllStructures()) {
			Message::Error("Failed to remove all rules from RSES rule set child.");
			return false;
		}

	}

	return true;

}

//-------------------------------------------------------------------
// Method........: DuplicateStructure
// Author........: Aleksander 豩rn
// Date..........:
// Description...: Duplicates only a specified reduct in the reduct
//                 set.
// Comments......: Duplicates any associated rules as well.
//                 Stuff higher up (e.g. annotations) is not
//                 duplicated.
// Revisions.....:
//===================================================================

Structures *
RSESReducts::DuplicateStructure(int i) const {

	// Check argument.
	if (i < 0 || i >= GetNoReducts())
		return NULL;

	Handle<RSESReducts> rsesreducts = Creator::RSESReducts();

	// Duplicate specified reduct wrapper (duplicates associated rules as well).
	try {

			// Get the reduct wrapper.
			Handle<RSESReduct> wrapper = dynamic_cast(RSESReduct *, GetStructure(i));

			// Duplicate the embedded RSES reduct.
			TReduct *duplicate  = new TReduct();
			TReduct *rsesreduct = wrapper->reduct_;

			*duplicate = *rsesreduct;

			// Add it to the embedded set to return.
			rsesreducts->reducts_->AddRed(duplicate);

	}

	// Catch any RSES exceptions.
	catch (Error &error) {
		Message::RSESError("Failed to duplicate embedded RSES reduct.", error.GetMessage());
		return NULL;
	}

	// Build wrappers.
	if (!rsesreducts->BuildWrappers())
		return NULL;

	return rsesreducts.Release();

}

//-------------------------------------------------------------------
// Methods inherited from Reducts.
//===================================================================

//-------------------------------------------------------------------
// Method........: Sort
// Author........: Aleksander 豩rn
// Date..........:
// Description...:
// Comments......: Sorts the wrappers only.
// Revisions.....:
//===================================================================

bool
RSESReducts::Sort(int property, bool ascending) {
	return Reducts::Sort(property, ascending);
}

//-------------------------------------------------------------------
// Method........: PostCreation
// Author........: Aleksander 豩rn
// Date..........:
// Description...:
// Comments......: Typically invoked after all the calls to the
//                 AppendReduct method have been made.
// Revisions.....:
//===================================================================

bool
RSESReducts::PostCreation(const DecisionTable &table, const Discerner &discerner, bool modulo) {

	MessageProxy message;

#ifdef _DEBUG
	// Is the RSES object instantiated?
	if (reducts_ == NULL) {
		Message::Error("Embedded RSES object not instantiated.");
		return false;
	}
#endif

	// Check compatibility.
	if (!table.IsA(RSESDECISIONTABLE))
		return false;

	// Cast to correct type.
	RSESDecisionTable *rsestable = dynamic_cast(RSESDecisionTable *, const_cast(DecisionTable *, &table));

	message.Notify("Computing statistics...");

	// Issue warnings?
	if (discerner.HasIDGs()) {
		Message::Warning("Support counts with IDGs not implemented by RSES.", false);
		if (modulo)
			Message::Warning("Generalized decisions with IDGs not implemented by RSES.", false);
	}

	// Let RSES create the rules/patterns.
	try {
		reducts_->UpDateRules(rsestable->decisiontable_, modulo, 0);
	}
	catch (Error &error) {
		Message::RSESError("Failed to update the embedded RSES reduct and rule memory.", error.GetMessage());
		return false;
	}

	return BuildWrappers(NULL);

}

//-------------------------------------------------------------------
// Method........: AppendReduct
// Author........: Aleksander 豩rn
// Date..........:
// Description...:
// Comments......: After all the calls to this method have been made,
//                 a call MUST be made to BuildWrappers if consistency
//                 between reduct wrappers and RSES reducts is to be
//                 ensured. (The system may crash otherwise, if you're
//                 unlucky.) The reason for this is that the AddRed
//                 method may *delete* the reduct we want to add,
//                 if an indentical reduct already exists. Thus, we
//                 can end up with a wrapper with a dangling pointer.
//
//                 RSES requires verifies uniqueness anyway (and
//                 does a deletion!), regardless of the state of
//                 the verify flag.
//
// Revisions.....:
//===================================================================

bool
RSESReducts::AppendReduct(Reduct *reduct, const DecisionTable &table, int object_no, bool /*masked*/, bool modulo, bool /*verify*/) {

#ifdef _DEBUG
	// Is the RSES object instantiated?
	if (reducts_ == NULL) {
		Message::Error("Embedded RSES object not instantiated.");
		return false;
	}
#endif

	// Check compatibility.
	if (reduct == NULL || !reduct->IsA(RSESREDUCT) || !table.IsA(RSESDECISIONTABLE))
		return false;

	// Cast to correct type.
	RSESReduct        *rsesreduct = dynamic_cast(RSESReduct *, reduct);
	RSESDecisionTable *rsestable  = dynamic_cast(RSESDecisionTable *, const_cast(DecisionTable *, &table));

	bool did_delete = false;

	// Add the embedded RSES reduct to the embedded reduct and rule memory.
	try {
		TDTable *tmp1 = reducts_->CurrentTable;
		int      tmp2 = reducts_->DecTable;
		reducts_->SetCurrentTable(rsestable->decisiontable_);
		reducts_->SetDecTable(modulo);
		did_delete = (reducts_->AddRed(rsesreduct->reduct_, object_no) != rsesreduct->reduct_);
		reducts_->SetCurrentTable(tmp1);
		reducts_->SetDecTable(tmp2);
	}
	catch (Error &error) {
		Message::RSESError("Failed to add the embedded RSES reduct to the embedded reduct and rule memory.", error.GetMessage());
		return false;
	}

	// Do something if the reduct was deleted. Return false, perhaps?
	if (did_delete) {
		// ...
	}

	// The embedded reduct and rule memory takes ownership of the embedded reduct.
	rsesreduct->is_owner_ = false;

	// Add the wrapper structure to the (wrapper) structure container, avoiding recursion.
	return Structures::InsertStructure(reduct, Structures::GetNoStructures());

}

//-------------------------------------------------------------------
// Local methods.
//===================================================================

//-------------------------------------------------------------------
// Method........: BuildWrappers
// Author........: Aleksander 豩rn
// Date..........:
// Description...: Creates wrappers for individual embedded reduct
//                 and rule objects from the RSES library.
//
//                 Wrappers are created so there is a one-to-one
//                 correspondence between the indices of the wrappers
//                 and the indices into the embedded TRedRulMem object.
//
// Comments......: Structures::InsertStructures used to avoid
//                 adding an embedded reduct to the embedded reduct
//                 memory when it is already a member.
//
//                 For similar reasons, the Structures:: qualifier is
//                 used when appropriate.
// Revisions.....:
//===================================================================

bool
RSESReducts::BuildWrappers(RSESRules *rules) {

	// Does an embedded RSES library object exist?
	if (reducts_ == NULL)
		return false;

	int i, no_reducts = GetNoStructures();

	// Remove any wrappers already present (keeping the embedded objects).
	if (no_reducts > 0) {
		for (i = no_reducts	- 1; i >= 0; i--) {
			if (!Structures::RemoveStructure(i)) {
				Message::Error("Failed to remove existing wrapper before building new ones.");
				return false;
			}
		}
	}

	// Create wrappers for individual reducts.
	try {

		// Determine how many wrappers to build.
		no_reducts = reducts_->NoReducts();

		// Build wrappers.
		for (i = 0; i < no_reducts; i++) {

			// Get the RSES reduct to embed.
			TReduct *embedded = reducts_->GetRed(i);

			// Instantiate a wrapper.
			Handle<RSESReduct> wrapper = Creator::RSESReduct();

			// Delete the default embedded reduct of the wrapper, and substitute it with the new one.
			delete wrapper->reduct_;
			wrapper->reduct_   = embedded;
			wrapper->is_owner_ = false;

			// Insert the wrapper into the wrapper list.
			if (!Structures::InsertStructure(const_cast(RSESReduct *, wrapper.GetPointer()), Structures::GetNoStructures())) {
				Message::Error("Error inserting individual reduct wrapper.");
				return false;
			}

		}

	}
	catch (Error &error) {
		Message::RSESError("Error accessing embedded RSES object, wrappers not properly built.", error.GetMessage());
		return false;
	}

	int no_rules;

	// Are there any rules associated with the embedded RSES reduct and rule memory?
	try {
		no_rules = reducts_->NoRules();
	}
	catch (Error &error) {
		Message::RSESError("Error accessing embedded RSES reduct and rule memory, only partial wrapping performed.", error.GetMessage());
		return false;
	}

	// No rules, we're done.
	if (no_rules == 0)
		return true;

	Handle<RSESRules> child;

	// Create a rule set wrapper, or use the one supplied.
	if (rules == NULL)
		child = Creator::RSESRules();
	else
		child = rules;

	// Append the rule set as a child.
	if (!AppendChild(child.GetPointer())) {
		Message::Error("Failed to append the set of RSES rules to the list of children.");
		return false;
	}

	// Set common embedded pointer to RSES reduct and rule memory.
	child->rules_ = reducts_;
	child->is_owner_ = !is_owner_;

	// Build wrappers for the rules.
	if (!child->BuildWrappers()) {
		Message::Error("Failed to create wrappers for individual RSES rules.");
		return false;
	}

	return true;

}

//-------------------------------------------------------------------
// Method........: TakeOwnership
// Author........: Aleksander 豩rn
// Date..........:
// Description...:
// Comments......:
// Revisions.....:
//===================================================================

void
RSESReducts::TakeOwnership(bool ownership) {

	// Set ownership flag for the TRedRulMem structure.
	is_owner_ = ownership;

	int i, no_reducts = GetNoReducts();

	// None of the wrappers own the embedded TReduct objects, the TRedRulMem object
	// takes ownership once a TReduct is added to the pool.
	for (i = 0; i < no_reducts; i++) {

		// Get wrapper around RSES reduct.
		Handle<RSESReduct> wrapper = dynamic_cast(RSESReduct *, GetReduct(i));

		// Set ownership flag for the embedded TReduct structure.
		wrapper->is_owner_ = false;

	}

}