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java.lang.Objectedu.udo.cs.yale.operator.Operator
edu.udo.cs.yale.operator.features.construction.FeatureGenerationOperator
public class FeatureGenerationOperator
This operator generates new user specified features. The new features are
specified by their function names (prefix notation) and their arguments using
the names of existing features.
Legal function names include +, -, *, /,
norm, sin, cos, tan, atan, exp, log, min, max, floor, ceil, round, sqrt, abs,
and pow. Constant values can be defined by "const[value]()" where
value is the desired value. Do not forget the empty round brackets. Example:
+(a1, *(a2, a3))
will calculate the sum of the attribute
a1
and the product of the attributes a2
and
a3
.
Features are generated in the following order
FeatureGenerator
Field Summary | |
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private static java.lang.Class[] |
INPUT_CLASSES
|
private static java.lang.Class[] |
OUTPUT_CLASSES
|
Constructor Summary | |
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FeatureGenerationOperator(OperatorDescription description)
|
Method Summary | |
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IOObject[] |
apply()
Implement this method in subclasses. |
java.lang.Class[] |
getInputClasses()
Returns the classes that are needed as input. |
java.lang.Class[] |
getOutputClasses()
Returns the classes that are guaranteed to be returned by apply() as additional output. |
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
Constructor Detail |
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public FeatureGenerationOperator(OperatorDescription description)
Method Detail |
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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 IOObject[] apply() throws OperatorException
Operator
apply
in class Operator
OperatorException
public java.util.List<ParameterType> getParameterTypes()
Operator
getParameterTypes
in class Operator
|
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