edu.udo.cs.miningmart.operator
Class ReverseFeatureConstruction

java.lang.Object
  edu.udo.cs.miningmart.operator.ExecutableOperator
      edu.udo.cs.miningmart.operator.FeatureConstruction
          edu.udo.cs.miningmart.operator.ReverseFeatureConstruction

public class ReverseFeatureConstruction
extends FeatureConstruction

Author:

euler This operator reverses the operation that constructed a feature in another step. It is a normal feature construction operator, only its method depends on the way the original feature was constructed. This operator is useful when the target values of a prediction task are changed during data preparation. This operator reverses those changes, and can therefore be used for deploying the values predicted by the learned model. For example, predicting the sales values of a shop with an SVM may require to scale the target values for training to [0..1]. Thus the SVM predicts only values between 0 and 1 when applied on unseen data. This operator then scales the values back to the original range.

Constructor Summary

ReverseFeatureConstruction()

Method Summary

java.lang.String

generateSQL(Column targetColumn) Abstract method to be implemented by all subclasses.

Methods inherited from class edu.udo.cs.miningmart.operator.FeatureConstruction

compileStatement, createStatement, execute, generateColumnForOp, getCurrentLoopNumber, getTheInputConcept, getTheOutputAttribute, getTheOutputAttribute, getTheTargetAttribute, getTheTargetAttribute, load, writeResults

Methods inherited from class edu.udo.cs.miningmart.operator.ExecutableOperator

autoPrint, checkConditions, doPrint, doPrint, executeBusinessSingleValueSqlRead, executeBusinessSingleValueSqlReadL, executeBusinessSqlRead, executeBusinessSqlWrite, executeM4SingleValueSqlRead, executeM4SingleValueSqlReadL, executeM4SqlRead, executeM4SqlWrite, getArtificalColumnName, getBusinessDbms, getHighestLoopNr, getM4Db, getM4Dbms, getM4ObjectFromCache, getName, getNextM4SequenceValue, getNumberOfLoops, getOperator, getOpParamsIterator, getParameter, getParameter, getParameterObjectsOfAllLoops, getSingleParameter, getSingleParameter, getStep, giveWarningForChangedInputData, handleAssertions, isDeselectedParameter, isLoopable, isManual, isStepable, print, putM4ObjectToCache, showCreateStatement, storedProceduresAvailable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReverseFeatureConstruction

public ReverseFeatureConstruction()

Method Detail

generateSQL

public java.lang.String generateSQL(Column targetColumn)
                             throws M4CompilerError

Description copied from class: FeatureConstruction

Abstract method to be implemented by all subclasses. In this method the SQL definition for the Column which this operator creates is created.

Specified by:

generateSQL in class FeatureConstruction

Parameters:

targetColumn - The Column to which this FeatureConstruction Operator is applied. Some subclasses may ignore this parameter.

Returns:

An SQL definition for the newly constructed Column.

Throws:

M4CompilerError - A simple exception object with an error message.

See Also:

FeatureConstruction.generateSQL(edu.udo.cs.miningmart.m4.Column)