/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Capabilities.java
* Copyright (C) 2006 University of Waikato, Hamilton, New Zealand
*/
package weka.core;
import weka.core.converters.ConverterUtils.DataSource;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Properties;
import java.util.Vector;
/**
* A class that describes the capabilites (e.g., handling certain types of
* attributes, missing values, types of classes, etc.) of a specific
* classifier. By default, the classifier is capable of nothing. This
* ensures that new features have to be enabled explicitly. <p/>
*
* A common code fragment for making use of the capabilities in a classifier
* would be this:
* <pre>
* public void <b>buildClassifier</b>(Instances instances) throws Exception {
* // can the classifier handle the data?
* getCapabilities().<b>testWithFail(instances)</b>;
* ...
* // possible deletion of instances with missing class labels, etc.
* </pre>
* For only testing a single attribute, use this:
* <pre>
* ...
* Attribute att = instances.attribute(0);
* getCapabilities().<b>testWithFail(att)</b>;
* ...
* </pre>
* Or for testing the class attribute (uses the capabilities that are
* especially for the class):
* <pre>
* ...
* Attribute att = instances.classAttribute();
* getCapabilities().<b>testWithFail(att, <i>true</i>)</b>;
* ...
* </pre>
*
* @author FracPete (fracpete at waikato dot ac dot nz)
* @version $Revision: 1.27 $
*/
public class Capabilities
implements Cloneable, Serializable, RevisionHandler {
/** serialversion UID */
static final long serialVersionUID = -5478590032325567849L;
/** the properties file for managing the tests */
public final static String PROPERTIES_FILE = "weka/core/Capabilities.props";
/** the actual properties */
protected static Properties PROPERTIES;
/** defines an attribute type */
private final static int ATTRIBUTE = 1;
/** defines a class type */
private final static int CLASS = 2;
/** defines an attribute capability */
private final static int ATTRIBUTE_CAPABILITY = 4;
/** defines a class capability */
private final static int CLASS_CAPABILITY = 8;
/** defines a other capability */
private final static int OTHER_CAPABILITY = 16;
/** enumeration of all capabilities */
public enum Capability {
// attributes
/** can handle nominal attributes */
NOMINAL_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "Nominal attributes"),
/** can handle binary attributes */
BINARY_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "Binary attributes"),
/** can handle unary attributes */
UNARY_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "Unary attributes"),
/** can handle empty nominal attributes */
EMPTY_NOMINAL_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "Empty nominal attributes"),
/** can handle numeric attributes */
NUMERIC_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "Numeric attributes"),
/** can handle date attributes */
DATE_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "Date attributes"),
/** can handle string attributes */
STRING_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "String attributes"),
/** can handle relational attributes */
RELATIONAL_ATTRIBUTES(ATTRIBUTE + ATTRIBUTE_CAPABILITY, "Relational attributes"),
/** can handle missing values in attributes */
MISSING_VALUES(ATTRIBUTE_CAPABILITY, "Missing values"),
// class
/** can handle data without class attribute, eg clusterers */
NO_CLASS(CLASS_CAPABILITY, "No class"),
/** can handle nominal classes */
NOMINAL_CLASS(CLASS + CLASS_CAPABILITY, "Nominal class"),
/** can handle binary classes */
BINARY_CLASS(CLASS + CLASS_CAPABILITY, "Binary class"),
/** can handle unary classes */
UNARY_CLASS(CLASS + CLASS_CAPABILITY, "Unary class"),
/** can handle empty nominal classes */
EMPTY_NOMINAL_CLASS(CLASS + CLASS_CAPABILITY, "Empty nominal class"),
/** can handle numeric classes */
NUMERIC_CLASS(CLASS + CLASS_CAPABILITY, "Numeric class"),
/** can handle date classes */
DATE_CLASS(CLASS + CLASS_CAPABILITY, "Date class"),
/** can handle string classes */
STRING_CLASS(CLASS + CLASS_CAPABILITY, "String class"),
/** can handle relational classes */
RELATIONAL_CLASS(CLASS + CLASS_CAPABILITY, "Relational class"),
/** can handle missing values in class attribute */
MISSING_CLASS_VALUES(CLASS_CAPABILITY, "Missing class values"),
// other
/** can handle multi-instance data */
ONLY_MULTIINSTANCE(OTHER_CAPABILITY, "Only multi-Instance data");
/** the flags for the capabilities */
private int m_Flags = 0;
/** the display string */
private String m_Display;
/**
* initializes the capability with the given flags
*
* @param flags "meta-data" for the capability
* @param display the display string (must be unique!)
*/
private Capability(int flags, String display) {
m_Flags = flags;
m_Display = display;
}
/**
* returns true if the capability is an attribute
*
* @return true if the capability is an attribute
*/
public boolean isAttribute() {
return ((m_Flags & ATTRIBUTE) == ATTRIBUTE);
}
/**
* returns true if the capability is a class
*
* @return true if the capability is a class
*/
public boolean isClass() {
return ((m_Flags & CLASS) == CLASS);
}
/**
* returns true if the capability is an attribute capability
*
* @return true if the capability is an attribute capability
*/
public boolean isAttributeCapability() {
return ((m_Flags & ATTRIBUTE_CAPABILITY) == ATTRIBUTE_CAPABILITY);
}
/**
* returns true if the capability is a class capability
*
* @return true if the capability is a class capability
*/
public boolean isOtherCapability() {
return ((m_Flags & OTHER_CAPABILITY) == OTHER_CAPABILITY);
}
/**
* returns true if the capability is a other capability
*
* @return true if the capability is a other capability
*/
public boolean isClassCapability() {
return ((m_Flags & CLASS_CAPABILITY) == CLASS_CAPABILITY);
}
/**
* returns the display string of the capability
*
* @return the display string
*/
public String toString() {
return m_Display;
}
};
/** the object that owns this capabilities instance */
protected CapabilitiesHandler m_Owner;
/** the hashset for storing the active capabilities */
protected HashSet m_Capabilities;
/** the hashset for storing dependent capabilities, eg for meta-classifiers */
protected HashSet m_Dependencies;
/** the reason why the test failed, used to throw an exception */
protected Exception m_FailReason = null;
/** the minimum number of instances in a dataset */
protected int m_MinimumNumberInstances = 1;
/** whether to perform any tests at all */
protected boolean m_Test;
/** whether to perform data based tests */
protected boolean m_InstancesTest;
/** whether to perform attribute based tests */
protected boolean m_AttributeTest;
/** whether to test for missing values */
protected boolean m_MissingValuesTest;
/** whether to test for missing class values */
protected boolean m_MissingClassValuesTest;
/** whether to test for minimum number of instances */
protected boolean m_MinimumNumberInstancesTest;
/**
* initializes the capabilities for the given owner
*
* @param owner the object that produced this Capabilities instance
*/
public Capabilities(CapabilitiesHandler owner) {
super();
setOwner(owner);
m_Capabilities = new HashSet();
m_Dependencies = new HashSet();
// load properties
if (PROPERTIES == null) {
try {
PROPERTIES = Utils.readProperties(PROPERTIES_FILE);
}
catch (Exception e) {
e.printStackTrace();
PROPERTIES = new Properties();
}
}
m_Test = Boolean.parseBoolean(PROPERTIES.getProperty("Test", "true"));
m_InstancesTest = Boolean.parseBoolean(PROPERTIES.getProperty("InstancesTest", "true")) && m_Test;
m_AttributeTest = Boolean.parseBoolean(PROPERTIES.getProperty("AttributeTest", "true")) && m_Test;
m_MissingValuesTest = Boolean.parseBoolean(PROPERTIES.getProperty("MissingValuesTest", "true")) && m_Test;
m_MissingClassValuesTest = Boolean.parseBoolean(PROPERTIES.getProperty("MissingClassValuesTest", "true")) && m_Test;
m_MinimumNumberInstancesTest = Boolean.parseBoolean(PROPERTIES.getProperty("MinimumNumberInstancesTest", "true")) && m_Test;
}
/**
* Creates and returns a copy of this object.
*
* @return a clone of this object
*/
public Object clone() {
Capabilities result;
result = new Capabilities(m_Owner);
result.assign(this);
return result;
}
/**
* retrieves the data from the given Capabilities object
*
* @param c the capabilities object to initialize with
*/
public void assign(Capabilities c) {
for (Capability cap: Capability.values()) {
// capability
if (c.handles(cap))
enable(cap);
else
disable(cap);
// dependency
if (c.hasDependency(cap))
enableDependency(cap);
else
disableDependency(cap);
}
setMinimumNumberInstances(c.getMinimumNumberInstances());
}
/**
* performs an AND conjunction with the capabilities of the given
* Capabilities object and updates itself
*
* @param c the capabilities to AND with
*/
public void and(Capabilities c) {
for (Capability cap: Capability.values()) {
// capability
if (handles(cap) && c.handles(cap))
m_Capabilities.add(cap);
else
m_Capabilities.remove(cap);
// dependency
if (hasDependency(cap) && c.hasDependency(cap))
m_Dependencies.add(cap);
else
m_Dependencies.remove(cap);
}
// minimum number of instances that both handlers need at least to work
if (c.getMinimumNumberInstances() > getMinimumNumberInstances())
setMinimumNumberInstances(c.getMinimumNumberInstances());
}
/**
* performs an OR conjunction with the capabilities of the given
* Capabilities object and updates itself
*
* @param c the capabilities to OR with
*/
public void or(Capabilities c) {
for (Capability cap: Capability.values()) {
// capability
if (handles(cap) || c.handles(cap))
m_Capabilities.add(cap);
else
m_Capabilities.remove(cap);
// dependency
if (hasDependency(cap) || c.hasDependency(cap))
m_Dependencies.add(cap);
else
m_Dependencies.remove(cap);
}
if (c.getMinimumNumberInstances() < getMinimumNumberInstances())
setMinimumNumberInstances(c.getMinimumNumberInstances());
}
/**
* Returns true if the currently set capabilities support at least all of
* the capabiliites of the given Capabilities object (checks only the enum!)
*
* @param c the capabilities to support at least
* @return true if all the requested capabilities are supported
*/
public boolean supports(Capabilities c) {
boolean result;
result = true;
for (Capability cap: Capability.values()) {
if (c.handles(cap) && !handles(cap)) {
result = false;
break;
}
}
return result;
}
/**
* Returns true if the currently set capabilities support (or have a
* dependency) at least all of the capabilities of the given Capabilities
* object (checks only the enum!)
*
* @param c the capabilities (or dependencies) to support at least
* @return true if all the requested capabilities are supported (or at
* least have a dependency)
*/
public boolean supportsMaybe(Capabilities c) {
boolean result;
result = true;
for (Capability cap: Capability.values()) {
if (c.handles(cap) && !(handles(cap) || hasDependency(cap))) {
result = false;
break;
}
}
return result;
}
/**
* sets the owner of this capabilities object
*
* @param value the new owner
*/
public void setOwner(CapabilitiesHandler value) {
m_Owner = value;
}
/**
* returns the owner of this capabilities object
*
* @return the current owner of this capabilites object
*/
public CapabilitiesHandler getOwner() {
return m_Owner;
}
/**
* sets the minimum number of instances that have to be in the dataset
*
* @param value the minimum number of instances
*/
public void setMinimumNumberInstances(int value) {
if (value >= 0)
m_MinimumNumberInstances = value;
}
/**
* returns the minimum number of instances that have to be in the dataset
*
* @return the minimum number of instances
*/
public int getMinimumNumberInstances() {
return m_MinimumNumberInstances;
}
/**
* Returns an Iterator over the stored capabilities
*
* @return iterator over the current capabilities
*/
public Iterator capabilities() {
return m_Capabilities.iterator();
}
/**
* Returns an Iterator over the stored dependencies
*
* @return iterator over the current dependencies
*/
public Iterator dependencies() {
return m_Dependencies.iterator();
}
/**
* enables the given capability.
* Enabling NOMINAL_ATTRIBUTES also enables BINARY_ATTRIBUTES,
* UNARY_ATTRIBUTES and EMPTY_NOMINAL_ATTRIBUTES.
* Enabling BINARY_ATTRIBUTES also enables UNARY_ATTRIBUTES and
* EMPTY_NOMINAL_ATTRIBUTES.
* Enabling UNARY_ATTRIBUTES also enables EMPTY_NOMINAL_ATTRIBUTES.
* But NOMINAL_CLASS only enables BINARY_CLASS, since normal schemes in Weka
* don't work with datasets that have only 1 class label (or none).
*
* @param c the capability to enable
*/
public void enable(Capability c) {
// attributes
if (c == Capability.NOMINAL_ATTRIBUTES) {
enable(Capability.BINARY_ATTRIBUTES);
}
else if (c == Capability.BINARY_ATTRIBUTES) {
enable(Capability.UNARY_ATTRIBUTES);
}
else if (c == Capability.UNARY_ATTRIBUTES) {
enable(Capability.EMPTY_NOMINAL_ATTRIBUTES);
}
// class
else if (c == Capability.NOMINAL_CLASS) {
enable(Capability.BINARY_CLASS);
}
m_Capabilities.add(c);
}
/**
* enables the dependency flag for the given capability
* Enabling NOMINAL_ATTRIBUTES also enables BINARY_ATTRIBUTES,
* UNARY_ATTRIBUTES and EMPTY_NOMINAL_ATTRIBUTES.
* Enabling BINARY_ATTRIBUTES also enables UNARY_ATTRIBUTES and
* EMPTY_NOMINAL_ATTRIBUTES.
* Enabling UNARY_ATTRIBUTES also enables EMPTY_NOMINAL_ATTRIBUTES.
* But NOMINAL_CLASS only enables BINARY_CLASS, since normal schemes in Weka
* don't work with datasets that have only 1 class label (or none).
*
* @param c the capability to enable the dependency flag for
*/
public void enableDependency(Capability c) {
// attributes
if (c == Capability.NOMINAL_ATTRIBUTES) {
enableDependency(Capability.BINARY_ATTRIBUTES);
}
else if (c == Capability.BINARY_ATTRIBUTES) {
enableDependency(Capability.UNARY_ATTRIBUTES);
}
else if (c == Capability.UNARY_ATTRIBUTES) {
enableDependency(Capability.EMPTY_NOMINAL_ATTRIBUTES);
}
// class
else if (c == Capability.NOMINAL_CLASS) {
enableDependency(Capability.BINARY_CLASS);
}
m_Dependencies.add(c);
}
/**
* enables all class types
*
* @see #disableAllClasses()
* @see #getClassCapabilities()
*/
public void enableAllClasses() {
for (Capability cap: Capability.values()) {
if (cap.isClass())
enable(cap);
}
}
/**
* enables all class type dependencies
*
* @see #disableAllClassDependencies()
* @see #getClassCapabilities()
*/
public void enableAllClassDependencies() {
for (Capability cap: Capability.values()) {
if (cap.isClass())
enableDependency(cap);
}
}
/**
* enables all attribute types
*
* @see #disableAllAttributes()
* @see #getAttributeCapabilities()
*/
public void enableAllAttributes() {
for (Capability cap: Capability.values()) {
if (cap.isAttribute())
enable(cap);
}
}
/**
* enables all attribute type dependencies
*
* @see #disableAllAttributeDependencies()
* @see #getAttributeCapabilities()
*/
public void enableAllAttributeDependencies() {
for (Capability cap: Capability.values()) {
if (cap.isAttribute())
enableDependency(cap);
}
}
/**
* disables the given capability
* Disabling NOMINAL_ATTRIBUTES also disables BINARY_ATTRIBUTES,
* UNARY_ATTRIBUTES and EMPTY_NOMINAL_ATTRIBUTES.
* Disabling BINARY_ATTRIBUTES also disables UNARY_ATTRIBUTES and
* EMPTY_NOMINAL_ATTRIBUTES.
* Disabling UNARY_ATTRIBUTES also disables EMPTY_NOMINAL_ATTRIBUTES.
* The same hierarchy applies to the class capabilities.
*
* @param c the capability to disable
*/
public void disable(Capability c) {
// attributes
if (c == Capability.NOMINAL_ATTRIBUTES) {
disable(Capability.BINARY_ATTRIBUTES);
}
else if (c == Capability.BINARY_ATTRIBUTES) {
disable(Capability.UNARY_ATTRIBUTES);
}
else if (c == Capability.UNARY_ATTRIBUTES) {
disable(Capability.EMPTY_NOMINAL_ATTRIBUTES);
}
// class
else if (c == Capability.NOMINAL_CLASS) {
disable(Capability.BINARY_CLASS);
}
else if (c == Capability.BINARY_CLASS) {
disable(Capability.UNARY_CLASS);
}
else if (c == Capability.UNARY_CLASS) {
disable(Capability.EMPTY_NOMINAL_CLASS);
}
m_Capabilities.remove(c);
}
/**
* disables the dependency of the given capability
* Disabling NOMINAL_ATTRIBUTES also disables BINARY_ATTRIBUTES,
* UNARY_ATTRIBUTES and EMPTY_NOMINAL_ATTRIBUTES.
* Disabling BINARY_ATTRIBUTES also disables UNARY_ATTRIBUTES and
* EMPTY_NOMINAL_ATTRIBUTES.
* Disabling UNARY_ATTRIBUTES also disables EMPTY_NOMINAL_ATTRIBUTES.
* The same hierarchy applies to the class capabilities.
*
* @param c the capability to disable the dependency flag for
*/
public void disableDependency(Capability c) {
// attributes
if (c == Capability.NOMINAL_ATTRIBUTES) {
disableDependency(Capability.BINARY_ATTRIBUTES);
}
else if (c == Capability.BINARY_ATTRIBUTES) {
disableDependency(Capability.UNARY_ATTRIBUTES);
}
else if (c == Capability.UNARY_ATTRIBUTES) {
disableDependency(Capability.EMPTY_NOMINAL_ATTRIBUTES);
}
// class
else if (c == Capability.NOMINAL_CLASS) {
disableDependency(Capability.BINARY_CLASS);
}
else if (c == Capability.BINARY_CLASS) {
disableDependency(Capability.UNARY_CLASS);
}
else if (c == Capability.UNARY_CLASS) {
disableDependency(Capability.EMPTY_NOMINAL_CLASS);
}
m_Dependencies.remove(c);
}
/**
* disables all class types
*
* @see #enableAllClasses()
* @see #getClassCapabilities()
*/
public void disableAllClasses() {
for (Capability cap: Capability.values()) {
if (cap.isClass())
disable(cap);
}
}
/**
* disables all class type dependencies
*
* @see #enableAllClassDependencies()
* @see #getClassCapabilities()
*/
public void disableAllClassDependencies() {
for (Capability cap: Capability.values()) {
if (cap.isClass())
disableDependency(cap);
}
}
/**
* disables all attribute types
*
* @see #enableAllAttributes()
* @see #getAttributeCapabilities()
*/
public void disableAllAttributes() {
for (Capability cap: Capability.values()) {
if (cap.isAttribute())
disable(cap);
}
}
/**
* disables all attribute type dependencies
*
* @see #enableAllAttributeDependencies()
* @see #getAttributeCapabilities()
*/
public void disableAllAttributeDependencies() {
for (Capability cap: Capability.values()) {
if (cap.isAttribute())
disableDependency(cap);
}
}
/**
* returns all class capabilities
*
* @return all capabilities regarding the class
* @see #enableAllClasses()
* @see #disableAllClasses()
*/
public Capabilities getClassCapabilities() {
Capabilities result;
result = new Capabilities(getOwner());
for (Capability cap: Capability.values()) {
if (cap.isClassCapability()) {
if (handles(cap))
result.m_Capabilities.add(cap);
}
}
return result;
}
/**
* returns all attribute capabilities
*
* @return all capabilities regarding attributes
* @see #enableAllAttributes()
* @see #disableAllAttributes()
*/
public Capabilities getAttributeCapabilities() {
Capabilities result;
result = new Capabilities(getOwner());
for (Capability cap: Capability.values()) {
if (cap.isAttributeCapability()) {
if (handles(cap))
result.m_Capabilities.add(cap);
}
}
return result;
}
/**
* returns all other capabilities, besides class and attribute related ones
*
* @return all other capabilities, besides class and attribute
* related ones
*/
public Capabilities getOtherCapabilities() {
Capabilities result;
result = new Capabilities(getOwner());
for (Capability cap: Capability.values()) {
if (cap.isOtherCapability()) {
if (handles(cap))
result.m_Capabilities.add(cap);
}
}
return result;
}
/**
* returns true if the classifier handler has the specified capability
*
* @param c the capability to test
* @return true if the classifier handler has the capability
*/
public boolean handles(Capability c) {
return m_Capabilities.contains(c);
}
/**
* returns true if the classifier handler has a dependency for the specified
* capability
*
* @param c the capability to test
* @return true if the classifier handler has a dependency for the
* capability
*/
public boolean hasDependency(Capability c) {
return m_Dependencies.contains(c);
}
/**
* Checks whether there are any dependencies at all
*
* @return true if there is at least one dependency for a capability
*/
public boolean hasDependencies() {
return (m_Dependencies.size() > 0);
}
/**
* returns the reason why the tests failed, is null if tests succeeded
*
* @return the reason why the tests failed
*/
public Exception getFailReason() {
return m_FailReason;
}
/**
* Generates the message for, e.g., an exception. Adds the classname before the
* actual message and returns that string.
*
* @param msg the actual content of the message, e.g., exception
* @return the new message
*/
protected String createMessage(String msg) {
String result;
result = "";
if (getOwner() != null)
result = getOwner().getClass().getName();
else
result = "<anonymous>";
result += ": " + msg;
return result;
}
/**
* Test the given attribute, whether it can be processed by the handler,
* given its capabilities. The method assumes that the specified attribute
* is not the class attribute.
*
* @param att the attribute to test
* @return true if all the tests succeeded
* @see #test(Attribute, boolean)
*/
public boolean test(Attribute att) {
return test(att, false);
}
/**
* Test the given attribute, whether it can be processed by the handler,
* given its capabilities.
*
* @param att the attribute to test
* @param isClass whether this attribute is the class attribute
* @return true if all the tests succeeded
* @see #m_AttributeTest
*/
public boolean test(Attribute att, boolean isClass) {
boolean result;
Capability cap;
Capability capBinary;
Capability capUnary;
Capability capEmpty;
String errorStr;
result = true;
// shall we test the data?
if (!m_AttributeTest)
return result;
// for exception
if (isClass)
errorStr = "class";
else
errorStr = "attributes";
switch (att.type()) {
case Attribute.NOMINAL:
if (isClass) {
cap = Capability.NOMINAL_CLASS;
capBinary = Capability.BINARY_CLASS;
capUnary = Capability.UNARY_CLASS;
capEmpty = Capability.EMPTY_NOMINAL_CLASS;
}
else {
cap = Capability.NOMINAL_ATTRIBUTES;
capBinary = Capability.BINARY_ATTRIBUTES;
capUnary = Capability.UNARY_ATTRIBUTES;
capEmpty = Capability.EMPTY_NOMINAL_ATTRIBUTES;
}
if (handles(cap) && (att.numValues() > 2))
break;
else if (handles(capBinary) && (att.numValues() == 2))
break;
else if (handles(capUnary) && (att.numValues() == 1))
break;
else if (handles(capEmpty) && (att.numValues() == 0))
break;
if (att.numValues() == 0) {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle empty nominal " + errorStr + "!"));
result = false;
}
if (att.numValues() == 1) {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle unary " + errorStr + "!"));
result = false;
}
else if (att.numValues() == 2) {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle binary " + errorStr + "!"));
result = false;
}
else {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle multi-valued nominal " + errorStr + "!"));
result = false;
}
break;
case Attribute.NUMERIC:
if (isClass)
cap = Capability.NUMERIC_CLASS;
else
cap = Capability.NUMERIC_ATTRIBUTES;
if (!handles(cap)) {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle numeric " + errorStr + "!"));
result = false;
}
break;
case Attribute.DATE:
if (isClass)
cap = Capability.DATE_CLASS;
else
cap = Capability.DATE_ATTRIBUTES;
if (!handles(cap)) {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle date " + errorStr + "!"));
result = false;
}
break;
case Attribute.STRING:
if (isClass)
cap = Capability.STRING_CLASS;
else
cap = Capability.STRING_ATTRIBUTES;
if (!handles(cap)) {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle string " + errorStr + "!"));
result = false;
}
break;
case Attribute.RELATIONAL:
if (isClass)
cap = Capability.RELATIONAL_CLASS;
else
cap = Capability.RELATIONAL_ATTRIBUTES;
if (!handles(cap)) {
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle relational " + errorStr + "!"));
result = false;
}
// attributes in the relation of this attribute must be tested
// separately with a different Capabilites object
break;
default:
m_FailReason = new UnsupportedAttributeTypeException(
createMessage("Cannot handle unknown attribute type '"
+ att.type() + "'!"));
result = false;
}
return result;
}
/**
* Tests the given data, whether it can be processed by the handler,
* given its capabilities. Classifiers implementing the
* <code>MultiInstanceCapabilitiesHandler</code> interface are checked
* automatically for their multi-instance Capabilities (if no bags, then
* only the bag-structure, otherwise only the first bag).
*
* @param data the data to test
* @return true if all the tests succeeded
* @see #test(Instances, int, int)
*/
public boolean test(Instances data) {
return test(data, 0, data.numAttributes() - 1);
}
/**
* Tests a certain range of attributes of the given data, whether it can be
* processed by the handler, given its capabilities. Classifiers
* implementing the <code>MultiInstanceCapabilitiesHandler</code> interface
* are checked automatically for their multi-instance Capabilities (if no
* bags, then only the bag-structure, otherwise only the first bag).
*
* @param data the data to test
* @param fromIndex the range of attributes - start (incl.)
* @param toIndex the range of attributes - end (incl.)
* @return true if all the tests succeeded
* @see MultiInstanceCapabilitiesHandler
* @see #m_InstancesTest
* @see #m_MissingValuesTest
* @see #m_MissingClassValuesTest
* @see #m_MinimumNumberInstancesTest
*/
public boolean test(Instances data, int fromIndex, int toIndex) {
int i;
int n;
int m;
Attribute att;
Instance inst;
boolean testClass;
Capabilities cap;
boolean missing;
Iterator iter;
// shall we test the data?
if (!m_InstancesTest)
return true;
// no Capabilities? -> warning
if ( (m_Capabilities.size() == 0)
|| ((m_Capabilities.size() == 1) && handles(Capability.NO_CLASS)) )
System.err.println(createMessage("No capabilities set!"));
// any attributes?
if (toIndex - fromIndex < 0) {
m_FailReason = new WekaException(
createMessage("No attributes!"));
return false;
}
// do wee need to test the class attribute, i.e., is the class attribute
// within the range of attributes?
testClass = (data.classIndex() > -1)
&& (data.classIndex() >= fromIndex)
&& (data.classIndex() <= toIndex);
// attributes
for (i = fromIndex; i <= toIndex; i++) {
att = data.attribute(i);
// class is handled separately
if (i == data.classIndex())
continue;
// check attribute types
if (!test(att))
return false;
}
// class
if (!handles(Capability.NO_CLASS) && (data.classIndex() == -1)) {
m_FailReason = new UnassignedClassException(
createMessage("Class attribute not set!"));
return false;
}
// special case: no class attribute can be handled
if (handles(Capability.NO_CLASS) && (data.classIndex() > -1)) {
cap = getClassCapabilities();
cap.disable(Capability.NO_CLASS);
iter = cap.capabilities();
if (!iter.hasNext()) {
m_FailReason = new WekaException(
createMessage("Cannot handle any class attribute!"));
return false;
}
}
if (testClass && !handles(Capability.NO_CLASS)) {
att = data.classAttribute();
if (!test(att, true))
return false;
// special handling of RELATIONAL class
// TODO: store additional Capabilities for this case
// missing class labels
if (m_MissingClassValuesTest) {
if (!handles(Capability.MISSING_CLASS_VALUES)) {
for (i = 0; i < data.numInstances(); i++) {
if (data.instance(i).classIsMissing()) {
m_FailReason = new WekaException(
createMessage("Cannot handle missing class values!"));
return false;
}
}
}
else {
if (m_MinimumNumberInstancesTest) {
int hasClass = 0;
for (i = 0; i < data.numInstances(); i++) {
if (!data.instance(i).classIsMissing())
hasClass++;
}
// not enough instances with class labels?
if (hasClass < getMinimumNumberInstances()) {
m_FailReason = new WekaException(
createMessage("Not enough training instances with class labels (required: "
+ getMinimumNumberInstances()
+ ", provided: "
+ hasClass + ")!"));
return false;
}
}
}
}
}
// missing values
if (m_MissingValuesTest) {
if (!handles(Capability.MISSING_VALUES)) {
missing = false;
for (i = 0; i < data.numInstances(); i++) {
inst = data.instance(i);
if (inst instanceof SparseInstance) {
for (m = 0; m < inst.numValues(); m++) {
n = inst.index(m);
// out of scope?
if (n < fromIndex)
continue;
if (n > toIndex)
break;
// skip class
if (n == inst.classIndex())
continue;
if (inst.isMissing(n)) {
missing = true;
break;
}
}
}
else {
for (n = fromIndex; n <= toIndex; n++) {
// skip class
if (n == inst.classIndex())
continue;
if (inst.isMissing(n)) {
missing = true;
break;
}
}
}
if (missing) {
m_FailReason = new NoSupportForMissingValuesException(
createMessage("Cannot handle missing values!"));
return false;
}
}
}
}
// instances
if (m_MinimumNumberInstancesTest) {
if (data.numInstances() < getMinimumNumberInstances()) {
m_FailReason = new WekaException(
createMessage("Not enough training instances (required: "
+ getMinimumNumberInstances()
+ ", provided: "
+ data.numInstances() + ")!"));
return false;
}
}
// Multi-Instance? -> check structure (regardless of attribute range!)
if (handles(Capability.ONLY_MULTIINSTANCE)) {
// number of attributes?
if (data.numAttributes() != 3) {
m_FailReason = new WekaException(
createMessage("Incorrect Multi-Instance format, must be 'bag-id, bag, class'!"));
return false;
}
// type of attributes and position of class?
if ( !data.attribute(0).isNominal()
|| !data.attribute(1).isRelationValued()
|| (data.classIndex() != data.numAttributes() - 1) ) {
m_FailReason = new WekaException(
createMessage("Incorrect Multi-Instance format, must be 'NOMINAL att, RELATIONAL att, CLASS att'!"));
return false;
}
// check data immediately
if (getOwner() instanceof MultiInstanceCapabilitiesHandler) {
MultiInstanceCapabilitiesHandler handler = (MultiInstanceCapabilitiesHandler) getOwner();
cap = handler.getMultiInstanceCapabilities();
boolean result;
if (data.numInstances() > 0)
result = cap.test(data.attribute(1).relation(0));
else
result = cap.test(data.attribute(1).relation());
if (!result) {
m_FailReason = cap.m_FailReason;
return false;
}
}
}
// passed all tests!
return true;
}
/**
* tests the given attribute by calling the test(Attribute,boolean) method
* and throws an exception if the test fails. The method assumes that the
* specified attribute is not the class attribute.
*
* @param att the attribute to test
* @throws Exception in case the attribute doesn't pass the tests
* @see #test(Attribute,boolean)
*/
public void testWithFail(Attribute att) throws Exception {
test(att, false);
}
/**
* tests the given attribute by calling the test(Attribute,boolean) method
* and throws an exception if the test fails.
*
* @param att the attribute to test
* @param isClass whether this attribute is the class attribute
* @throws Exception in case the attribute doesn't pass the tests
* @see #test(Attribute,boolean)
*/
public void testWithFail(Attribute att, boolean isClass) throws Exception {
if (!test(att, isClass))
throw m_FailReason;
}
/**
* tests the given data by calling the test(Instances,int,int) method and
* throws an exception if the test fails.
*
* @param data the data to test
* @param fromIndex the range of attributes - start (incl.)
* @param toIndex the range of attributes - end (incl.)
* @throws Exception in case the data doesn't pass the tests
* @see #test(Instances,int,int)
*/
public void testWithFail(Instances data, int fromIndex, int toIndex) throws Exception {
if (!test(data, fromIndex, toIndex))
throw m_FailReason;
}
/**
* tests the given data by calling the test(Instances) method and throws
* an exception if the test fails.
*
* @param data the data to test
* @throws Exception in case the data doesn't pass the tests
* @see #test(Instances)
*/
public void testWithFail(Instances data) throws Exception {
if (!test(data))
throw m_FailReason;
}
/**
* returns a string representation of the capabilities
*
* @return a string representation of this object
*/
public String toString() {
Vector sorted;
StringBuffer result;
result = new StringBuffer();
// capabilities
sorted = new Vector(m_Capabilities);
Collections.sort(sorted);
result.append("Capabilities: " + sorted.toString() + "\n");
// dependencies
sorted = new Vector(m_Dependencies);
Collections.sort(sorted);
result.append("Dependencies: " + sorted.toString() + "\n");
// other stuff
result.append("min # Instance: " + getMinimumNumberInstances() + "\n");
return result.toString();
}
/**
* turns the capabilities object into source code. The returned source code
* is a block that creates a Capabilities object named 'objectname' and
* enables all the capabilities of this Capabilities object.
*
* @param objectname the name of the Capabilities object being instantiated
* @return the generated source code
*/
public String toSource(String objectname) {
return toSource(objectname, 0);
}
/**
* turns the capabilities object into source code. The returned source code
* is a block that creates a Capabilities object named 'objectname' and
* enables all the capabilities of this Capabilities object.
*
* @param objectname the name of the Capabilities object being instantiated
* @param indent the number of blanks to indent
* @return the generated source code
*/
public String toSource(String objectname, int indent) {
StringBuffer result;
String capsName;
String capName;
String indentStr;
int i;
result = new StringBuffer();
capsName = Capabilities.class.getName();
capName = Capabilities.Capability.class.getName().replaceAll("\\$", ".");
indentStr = "";
for (i = 0; i < indent; i++)
indentStr += " ";
// object name
result.append(indentStr + capsName + " " + objectname + " = new " + capsName + "(this);\n");
// capabilities
result.append("\n");
for (Capability cap: Capability.values()) {
// capability
if (handles(cap))
result.append(
indentStr + objectname + ".enable(" + capName + "." + cap.name() + ");\n");
// dependency
if (hasDependency(cap))
result.append(
indentStr + objectname + ".enableDependency(" + capName + "." + cap.name() + ");\n");
}
// other
result.append("\n");
result.append(
indentStr + objectname + ".setMinimumNumberInstances("
+ getMinimumNumberInstances() + ");\n");
result.append("\n");
return result.toString();
}
/**
* returns a Capabilities object specific for this data. The multi-instance
* capability is not checked as well as the minimum number of instances
* is not set.
*
* @param data the data to base the capabilities on
* @return a data-specific capabilities object
* @throws Exception in case an error occurrs, e.g., an unknown attribute
* type
*/
public static Capabilities forInstances(Instances data) throws Exception {
return forInstances(data, false);
}
/**
* returns a Capabilities object specific for this data. The minimum number
* of instances is not set, the check for multi-instance data is optional.
*
* @param data the data to base the capabilities on
* @param multi if true then the structure is checked, too
* @return a data-specific capabilities object
* @throws Exception in case an error occurrs, e.g., an unknown attribute
* type
*/
public static Capabilities forInstances(Instances data, boolean multi) throws Exception {
Capabilities result;
Capabilities multiInstance;
int i;
int n;
int m;
Instance inst;
boolean missing;
result = new Capabilities(null);
// class
if (data.classIndex() == -1) {
result.enable(Capability.NO_CLASS);
}
else {
switch (data.classAttribute().type()) {
case Attribute.NOMINAL:
if (data.classAttribute().numValues() == 1)
result.enable(Capability.UNARY_CLASS);
else if (data.classAttribute().numValues() == 2)
result.enable(Capability.BINARY_CLASS);
else
result.enable(Capability.NOMINAL_CLASS);
break;
case Attribute.NUMERIC:
result.enable(Capability.NUMERIC_CLASS);
break;
case Attribute.STRING:
result.enable(Capability.STRING_CLASS);
break;
case Attribute.DATE:
result.enable(Capability.DATE_CLASS);
break;
case Attribute.RELATIONAL:
result.enable(Capability.RELATIONAL_CLASS);
break;
default:
throw new UnsupportedAttributeTypeException(
"Unknown class attribute type '" + data.classAttribute() + "'!");
}
// missing class values
for (i = 0; i < data.numInstances(); i++) {
if (data.instance(i).classIsMissing()) {
result.enable(Capability.MISSING_CLASS_VALUES);
break;
}
}
}
// attributes
for (i = 0; i < data.numAttributes(); i++) {
// skip class
if (i == data.classIndex())
continue;
switch (data.attribute(i).type()) {
case Attribute.NOMINAL:
result.enable(Capability.UNARY_ATTRIBUTES);
if (data.attribute(i).numValues() == 2)
result.enable(Capability.BINARY_ATTRIBUTES);
else if (data.attribute(i).numValues() > 2)
result.enable(Capability.NOMINAL_ATTRIBUTES);
break;
case Attribute.NUMERIC:
result.enable(Capability.NUMERIC_ATTRIBUTES);
break;
case Attribute.DATE:
result.enable(Capability.DATE_ATTRIBUTES);
break;
case Attribute.STRING:
result.enable(Capability.STRING_ATTRIBUTES);
break;
case Attribute.RELATIONAL:
result.enable(Capability.RELATIONAL_ATTRIBUTES);
break;
default:
throw new UnsupportedAttributeTypeException(
"Unknown attribute type '" + data.attribute(i).type() + "'!");
}
}
// missing values
missing = false;
for (i = 0; i < data.numInstances(); i++) {
inst = data.instance(i);
if (inst instanceof SparseInstance) {
for (m = 0; m < inst.numValues(); m++) {
n = inst.index(m);
// skip class
if (n == inst.classIndex())
continue;
if (inst.isMissing(n)) {
missing = true;
break;
}
}
}
else {
for (n = 0; n < data.numAttributes(); n++) {
// skip class
if (n == inst.classIndex())
continue;
if (inst.isMissing(n)) {
missing = true;
break;
}
}
}
if (missing) {
result.enable(Capability.MISSING_VALUES);
break;
}
}
// multi-instance data?
if (multi) {
if ( (data.numAttributes() == 3)
&& (data.attribute(0).isNominal()) // bag-id
&& (data.attribute(1).isRelationValued()) // bag
&& (data.classIndex() == data.numAttributes() - 1) ) {
multiInstance = new Capabilities(null);
multiInstance.or(result.getClassCapabilities());
multiInstance.enable(Capability.NOMINAL_ATTRIBUTES);
multiInstance.enable(Capability.RELATIONAL_ATTRIBUTES);
multiInstance.enable(Capability.ONLY_MULTIINSTANCE);
result.assign(multiInstance);
}
}
return result;
}
/**
* loads the given dataset and prints the Capabilities necessary to
* process it. <p/>
*
* Valid parameters: <p/>
*
* -file filename <br/>
* the file to load
*
* -c index
* the explicit index of the class attribute (default: none)
*
* @param args the commandline arguments
* @throws Exception if something goes wrong
*/
public static void main(String[] args) throws Exception {
String tmpStr;
String filename;
DataSource source;
Instances data;
int classIndex;
Capabilities cap;
Iterator iter;
if (args.length == 0) {
System.out.println(
"\nUsage: " + Capabilities.class.getName()
+ " -file <dataset> [-c <class index>]\n");
return;
}
// get parameters
tmpStr = Utils.getOption("file", args);
if (tmpStr.length() == 0)
throw new Exception("No file provided with option '-file'!");
else
filename = tmpStr;
tmpStr = Utils.getOption("c", args);
if (tmpStr.length() != 0) {
if (tmpStr.equals("first"))
classIndex = 0;
else if (tmpStr.equals("last"))
classIndex = -2; // last
else
classIndex = Integer.parseInt(tmpStr) - 1;
}
else {
classIndex = -3; // not set
}
// load data
source = new DataSource(filename);
if (classIndex == -3)
data = source.getDataSet();
else if (classIndex == -2)
data = source.getDataSet(source.getStructure().numAttributes() - 1);
else
data = source.getDataSet(classIndex);
// determine and print capabilities
cap = forInstances(data);
System.out.println("File: " + filename);
System.out.println("Class index: " + ((data.classIndex() == -1) ? "not set" : "" + (data.classIndex() + 1)));
System.out.println("Capabilities:");
iter = cap.capabilities();
while (iter.hasNext())
System.out.println("- " + iter.next());
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 1.27 $");
}
}