com.rapidminer.operator.io
Class C45ExampleSource

java.lang.Object
  com.rapidminer.operator.Operator
      com.rapidminer.operator.io.AbstractReader<ExampleSet>
          com.rapidminer.operator.io.AbstractExampleSource
              com.rapidminer.operator.io.C45ExampleSource

All Implemented Interfaces:

ConfigurationListener, PreviewListener, ParameterHandler, LoggingHandler

public class C45ExampleSource
extends AbstractExampleSource

Loads data given in C4.5 format (names and data file). Both files must be in the same directory. You can specify one of the C4.5 files (either the data or the names file) or only the filestem.

For a dataset named "foo", you will have two files: foo.data and foo.names. The .names file describes the dataset, while the .data file contains the examples which make up the dataset.

The files contain series of identifiers and numbers with some surrounding syntax. A | (vertical bar) means that the remainder of the line should be ignored as a comment. Each identifier consists of a string of characters that does not include comma, question mark or colon. Embedded whitespce is also permitted but multiple whitespace is replaced by a single space.

The .names file contains a series of entries that describe the classes, attributes and values of the dataset. Each entry can be terminated with a period, but the period can be omited if it would have been the last thing on a line. The first entry in the file lists the names of the classes, separated by commas. Each successive line then defines an attribute, in the order in which they will appear in the .data file, with the following format:

   attribute-name : attribute-type
 

The attribute-name is an identifier as above, followed by a colon, then the attribute type which must be one of

• continuous If the attribute has a continuous value.
• discrete [n] The word 'discrete' followed by an integer which indicates how many values the attribute can take (not recommended, please use the method depicted below for defining nominal attributes).
• [list of identifiers] This is a discrete, i.e. nominal, attribute with the values enumerated (this is the prefered method for discrete attributes). The identifiers should be separated by commas.
• ignore This means that the attribute should be ignored - it won't be used. This is not supported by RapidMiner, please use one of the attribute selection operators after loading if you want to ignore attributes and remove them from the loaded example set.

Here is an example .names file:

   good, bad.
   dur: continuous.
   wage1: continuous.
   wage2: continuous.
   wage3: continuous.
   cola: tc, none, tcf.
   hours: continuous.
   pension: empl_contr, ret_allw, none.
   stby_pay: continuous.
   shift_diff: continuous.
   educ_allw: yes, no.
   ...
 

Foo.data contains the training examples in the following format: one example per line, attribute values separated by commas, class last, missing values represented by "?". For example:

   2,5.0,4.0,?,none,37,?,?,5,no,11,below_average,yes,full,yes,full,good
   3,2.0,2.5,?,?,35,none,?,?,?,10,average,?,?,yes,full,bad
   3,4.5,4.5,5.0,none,40,?,?,?,no,11,average,?,half,?,?,good
   3,3.0,2.0,2.5,tc,40,none,?,5,no,10,below_average,yes,half,yes,full,bad
   ...
 

Author:

Ingo Mierswa

Field Summary

static java.lang.String	PARAMETER_C45_FILESTEM The parameter name for "The path to either the C4.5 names file, the data file, or the filestem (without extensions).
static java.lang.String	PARAMETER_DATAMANAGEMENT The parameter name for "Determines, how the data is represented internally.
static java.lang.String	PARAMETER_DECIMAL_POINT_CHARACTER The parameter name for "Character that is used as decimal point.

Constructor Summary

C45ExampleSource(OperatorDescription description)

Method Summary

ExampleSet	createExampleSet() Creates (or reads) the ExampleSet that will be returned by AbstractReader.apply().
java.util.List<ParameterType>	getParameterTypes() Returns a list of ParameterTypes describing the parameters of this operator.

Methods inherited from class com.rapidminer.operator.io.AbstractExampleSource

read

Methods inherited from class com.rapidminer.operator.io.AbstractReader

apply, getInputClasses, getOutputClasses

Methods inherited from class com.rapidminer.operator.Operator

addError, addValue, addWarning, apply, checkDeprecations, checkForStop, checkIO, checkProperties, clearErrorList, cloneOperator, createExperimentTree, createExperimentTree, createFromXML, createMarkedExperimentTree, createMarkedProcessTree, createProcessTree, createProcessTree, getAddOnlyAdditionalOutput, getApplyCount, getDeliveredOutputClasses, getDeprecationInfo, getDesiredInputClasses, getEncoding, getErrorList, getExperiment, getInnerOperatorsXML, getInput, getInput, getInput, getInputDescription, getIOContainerForInApplyLoopBreakpoint, getIODescription, getLog, getName, getOperatorClassName, getOperatorDescription, getParameter, getParameterAsBoolean, getParameterAsColor, getParameterAsDouble, getParameterAsFile, getParameterAsFile, getParameterAsInputStream, getParameterAsInt, getParameterAsMatrix, getParameterAsString, getParameterList, getParameters, getParameterType, getParent, getProcess, getStartTime, getStatus, getUserDescription, getValue, getValues, getXML, hasBreakpoint, hasBreakpoint, hasInput, inApplyLoop, isDebugMode, isEnabled, isExpanded, isParallel, isParameterSet, log, logError, logNote, logWarning, performAdditionalChecks, processFinished, processStarts, register, registerOperator, remove, rename, resume, setApplyCount, setBreakpoint, setEnabled, setExpanded, setInput, setListParameter, setOperatorParameters, setParameter, setParameters, setParent, setUserDescription, toString, unregisterOperator, writeXML

Methods inherited from class java.lang.Object

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

Field Detail

PARAMETER_C45_FILESTEM

public static final java.lang.String PARAMETER_C45_FILESTEM

The parameter name for "The path to either the C4.5 names file, the data file, or the filestem (without extensions). Both files must be in the same directory."

See Also:

Constant Field Values

PARAMETER_DATAMANAGEMENT

public static final java.lang.String PARAMETER_DATAMANAGEMENT

The parameter name for "Determines, how the data is represented internally."

See Also:

Constant Field Values

PARAMETER_DECIMAL_POINT_CHARACTER

public static final java.lang.String PARAMETER_DECIMAL_POINT_CHARACTER

The parameter name for "Character that is used as decimal point."

See Also:

Constant Field Values

Constructor Detail

C45ExampleSource

public C45ExampleSource(OperatorDescription description)

Method Detail

createExampleSet

public ExampleSet createExampleSet()
                            throws OperatorException

Description copied from class: AbstractExampleSource

Creates (or reads) the ExampleSet that will be returned by AbstractReader.apply().

Specified by:

createExampleSet in class AbstractExampleSource

Throws:

OperatorException

getParameterTypes

public java.util.List<ParameterType> getParameterTypes()

Description copied from class: Operator

Returns a list of ParameterTypes describing the parameters of this operator. The default implementation returns an empty list if no input objects can be retained and special parameters for those input objects which can be prevented from being consumed.

Specified by:

getParameterTypes in interface ParameterHandler

Overrides:

getParameterTypes in class Operator