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java.lang.Objectedu.udo.cs.yale.operator.Operator
edu.udo.cs.yale.operator.OperatorChain
edu.udo.cs.yale.operator.meta.WeightOptimization
public class WeightOptimization
Performs a feature selection guided by the AttributeWeights. Forward selection means that features with the highest weight-value are selected first (starting with an empty selection). Backward elemination means that features with the smallest weight value are eleminated first (starting with the full feature set).
Field Summary | |
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private ParameterSet |
best
|
private double |
bestweight
|
private double |
currentweight
|
private static java.lang.String[] |
DIRECTIONS
|
private static java.lang.Class[] |
INPUT_CLASSES
|
private double |
lastperf
|
private double |
lastweight
|
private double |
min_diff
|
private int |
numberOfCombinations
|
private Operator |
operator
|
private static java.lang.Class[] |
OUTPUT_CLASSES
|
private java.lang.String |
parameter
|
private double[] |
weights
|
Constructor Summary | |
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WeightOptimization(OperatorDescription description)
|
Method Summary | |
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IOObject[] |
apply()
Applies all inner operators. |
InnerOperatorCondition |
getInnerOperatorCondition()
Must return a condition of the IO behaviour of all desired inner operators. |
java.lang.Class[] |
getInputClasses()
Returns the classes that are needed as input. |
int |
getMaxNumberOfInnerOperators()
Returns the maximum number of innner operators. |
int |
getMinNumberOfInnerOperators()
Returns the minimum number of innner operators. |
int |
getNumberOfSteps()
Returns the number of steps performed by this chain. |
java.lang.Class[] |
getOutputClasses()
Returns the classes that are guaranteed to be returned by apply() as additional output. |
void |
getParametersToOptimize()
|
java.util.List<ParameterType> |
getParameterTypes()
Returns a list of ParameterTypes describing the parameters of this operator. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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private static final java.lang.Class[] INPUT_CLASSES
private static final java.lang.Class[] OUTPUT_CLASSES
private static final java.lang.String[] DIRECTIONS
private ParameterSet best
private double[] weights
private double currentweight
private double lastweight
private double lastperf
private double bestweight
private Operator operator
private java.lang.String parameter
private double min_diff
private int numberOfCombinations
Constructor Detail |
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public WeightOptimization(OperatorDescription description)
Method Detail |
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public IOObject[] apply() throws OperatorException
OperatorChain
OperatorChain.clearStepCounter()
.
apply
in class OperatorChain
OperatorException
public InnerOperatorCondition getInnerOperatorCondition()
OperatorChain
SimpleChainInnerOperatorCondition
. More than one
condition should be combined with help of the class
CombinedInnerOperatorCondition
.
getInnerOperatorCondition
in class OperatorChain
public int getMaxNumberOfInnerOperators()
OperatorChain
getMaxNumberOfInnerOperators
in class OperatorChain
public int getMinNumberOfInnerOperators()
OperatorChain
getMinNumberOfInnerOperators
in class OperatorChain
public int getNumberOfSteps()
OperatorChain
getNumberOfSteps
in class OperatorChain
public java.lang.Class[] getInputClasses()
Operator
Operator.getOutputClasses()
and
Operator.apply()
if this is necessary. This default behavior can be
changed by overriding Operator.getInputDescription(Class)
. Subclasses
which implement this method should not make use of parameters since this
method is invoked by getParameterTypes(). Therefore, parameters are not
fully available at this point of time and this might lead to exceptions.
Please use InputDescriptions instead.
getInputClasses
in class Operator
public java.lang.Class[] getOutputClasses()
Operator
Operator.getInputDescription(Class)
and can be changed by
overwriting this method. Objects which are not consumed must not be
defined as additional output in this method. May be null or an empy array
(no additional output is produced).
getOutputClasses
in class Operator
public void getParametersToOptimize() throws OperatorException
OperatorException
public java.util.List<ParameterType> getParameterTypes()
Operator
getParameterTypes
in class Operator
|
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