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java.lang.Objectedu.udo.cs.yale.operator.Operator
edu.udo.cs.yale.operator.preprocessing.sampling.StratifiedSampling
public class StratifiedSampling
Stratified sampling operator. This operator performs a random sampling of a given fraction. In contrast to the simple sampling operator, this operator performs a stratified sampling for data sets with nominal label attributes, i.e. the class distributions remains (almost) the same after sampling. Hence, this operator cannot be applied on data sets without a label or with a non-numerical label. In these cases a simple sampling without stratification is performed.
Constructor Summary | |
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StratifiedSampling(OperatorDescription description)
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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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public StratifiedSampling(OperatorDescription description)
Method Detail |
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public IOObject[] apply() throws OperatorException
Operator
apply
in class Operator
OperatorException
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 java.util.List<ParameterType> getParameterTypes()
Operator
getParameterTypes
in class Operator
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