类 Resample
java.lang.Object
weka.filters.Filter
weka.filters.supervised.instance.Resample
Produces a random subsample of a dataset using either sampling with replacement or without replacement.
The original dataset must fit entirely in memory. The number of instances in the generated dataset may be specified. The dataset must have a nominal class attribute. If not, use the unsupervised version. The filter can be made to maintain the class distribution in the subsample, or to bias the class distribution toward a uniform distribution. When used in batch mode (i.e. in the FilteredClassifier), subsequent batches are NOT resampled. Valid options are:
The original dataset must fit entirely in memory. The number of instances in the generated dataset may be specified. The dataset must have a nominal class attribute. If not, use the unsupervised version. The filter can be made to maintain the class distribution in the subsample, or to bias the class distribution toward a uniform distribution. When used in batch mode (i.e. in the FilteredClassifier), subsequent batches are NOT resampled. Valid options are:
-S <num> Specify the random number seed (default 1)
-Z <num> The size of the output dataset, as a percentage of the input dataset (default 100)
-B <num> Bias factor towards uniform class distribution. 0 = distribution in input data -- 1 = uniform distribution. (default 0)
-no-replacement Disables replacement of instances (default: with replacement)
-V Inverts the selection - only available with '-no-replacement'.
- 版本:
- $Revision: 5542 $
- 作者:
- Len Trigg (len@reeltwo.com), FracPete (fracpete at waikato dot ac dot nz)
- 另请参阅:
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构造器概要
构造器 -
方法概要
修饰符和类型方法说明boolean
Signify that this batch of input to the filter is finished.Returns the tip text for this property.void
createSubsampleWithoutReplacement
(Random random, int origSize, int sampleSize, int actualClasses, int[] classIndices) creates the subsample without replacement.void
createSubsampleWithReplacement
(Random random, int origSize, int sampleSize, int actualClasses, int[] classIndices) creates the subsample with replacement.double
Gets the bias towards a uniform class.Returns the Capabilities of this filter.boolean
Gets whether selection is inverted (only if instances are drawn WIHTOUT replacement).boolean
Gets whether instances are drawn with or without replacement.String[]
Gets the current settings of the filter.int
Gets the random number seed.Returns the revision string.double
Gets the subsample size as a percentage of the original set.Returns a string describing this filter.boolean
Input an instance for filtering.Returns the tip text for this property.Returns an enumeration describing the available options.static void
Main method for testing this class.Returns the tip text for this property.Returns the tip text for this property.Returns the tip text for this property.void
setBiasToUniformClass
(double newBiasToUniformClass) Sets the bias towards a uniform class.boolean
setInputFormat
(Instances instanceInfo) Sets the format of the input instances.void
setInvertSelection
(boolean value) Sets whether the selection is inverted (only if instances are drawn WIHTOUT replacement).void
setNoReplacement
(boolean value) Sets whether instances are drawn with or with out replacement.void
setOptions
(String[] options) Parses a given list of options.void
setRandomSeed
(int newSeed) Sets the random number seed.void
setSampleSizePercent
(double newSampleSizePercent) Sets the size of the subsample, as a percentage of the original set.从类继承的方法 weka.filters.Filter
batchFilterFile, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper
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构造器详细资料
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Resample
public Resample()
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方法详细资料
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globalInfo
Returns a string describing this filter.- 返回:
- a description of the filter suitable for displaying in the explorer/experimenter gui
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listOptions
Returns an enumeration describing the available options.- 指定者:
listOptions
在接口中OptionHandler
- 返回:
- an enumeration of all the available options.
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setOptions
Parses a given list of options. Valid options are:-S <num> Specify the random number seed (default 1)
-Z <num> The size of the output dataset, as a percentage of the input dataset (default 100)
-B <num> Bias factor towards uniform class distribution. 0 = distribution in input data -- 1 = uniform distribution. (default 0)
-no-replacement Disables replacement of instances (default: with replacement)
-V Inverts the selection - only available with '-no-replacement'.
- 指定者:
setOptions
在接口中OptionHandler
- 参数:
options
- the list of options as an array of strings- 抛出:
Exception
- if an option is not supported
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getOptions
Gets the current settings of the filter.- 指定者:
getOptions
在接口中OptionHandler
- 返回:
- an array of strings suitable for passing to setOptions
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biasToUniformClassTipText
Returns the tip text for this property.- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
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getBiasToUniformClass
public double getBiasToUniformClass()Gets the bias towards a uniform class. A value of 0 leaves the class distribution as-is, a value of 1 ensures the class distributions are uniform in the output data.- 返回:
- the current bias
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setBiasToUniformClass
public void setBiasToUniformClass(double newBiasToUniformClass) Sets the bias towards a uniform class. A value of 0 leaves the class distribution as-is, a value of 1 ensures the class distributions are uniform in the output data.- 参数:
newBiasToUniformClass
- the new bias value, between 0 and 1.
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randomSeedTipText
Returns the tip text for this property.- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
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getRandomSeed
public int getRandomSeed()Gets the random number seed.- 返回:
- the random number seed.
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setRandomSeed
public void setRandomSeed(int newSeed) Sets the random number seed.- 参数:
newSeed
- the new random number seed.
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sampleSizePercentTipText
Returns the tip text for this property.- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
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getSampleSizePercent
public double getSampleSizePercent()Gets the subsample size as a percentage of the original set.- 返回:
- the subsample size
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setSampleSizePercent
public void setSampleSizePercent(double newSampleSizePercent) Sets the size of the subsample, as a percentage of the original set.- 参数:
newSampleSizePercent
- the subsample set size, between 0 and 100.
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noReplacementTipText
Returns the tip text for this property.- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
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getNoReplacement
public boolean getNoReplacement()Gets whether instances are drawn with or without replacement.- 返回:
- true if the replacement is disabled
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setNoReplacement
public void setNoReplacement(boolean value) Sets whether instances are drawn with or with out replacement.- 参数:
value
- if true then the replacement of instances is disabled
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invertSelectionTipText
Returns the tip text for this property.- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
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getInvertSelection
public boolean getInvertSelection()Gets whether selection is inverted (only if instances are drawn WIHTOUT replacement).- 返回:
- true if the replacement is disabled
- 另请参阅:
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m_NoReplacement
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setInvertSelection
public void setInvertSelection(boolean value) Sets whether the selection is inverted (only if instances are drawn WIHTOUT replacement).- 参数:
value
- if true then selection is inverted
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getCapabilities
Returns the Capabilities of this filter.- 指定者:
getCapabilities
在接口中CapabilitiesHandler
- 覆盖:
getCapabilities
在类中Filter
- 返回:
- the capabilities of this object
- 另请参阅:
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setInputFormat
Sets the format of the input instances.- 覆盖:
setInputFormat
在类中Filter
- 参数:
instanceInfo
- an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).- 返回:
- true if the outputFormat may be collected immediately
- 抛出:
Exception
- if the input format can't be set successfully
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input
Input an instance for filtering. Filter requires all training instances be read before producing output.- 覆盖:
input
在类中Filter
- 参数:
instance
- the input instance- 返回:
- true if the filtered instance may now be collected with output().
- 抛出:
IllegalStateException
- if no input structure has been defined
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batchFinished
public boolean batchFinished()Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances.- 覆盖:
batchFinished
在类中Filter
- 返回:
- true if there are instances pending output
- 抛出:
IllegalStateException
- if no input structure has been defined
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createSubsampleWithReplacement
public void createSubsampleWithReplacement(Random random, int origSize, int sampleSize, int actualClasses, int[] classIndices) creates the subsample with replacement.- 参数:
random
- the random number generator to useorigSize
- the original size of the datasetsampleSize
- the size to generateactualClasses
- the number of classes found in the dataclassIndices
- the indices where classes start
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createSubsampleWithoutReplacement
public void createSubsampleWithoutReplacement(Random random, int origSize, int sampleSize, int actualClasses, int[] classIndices) creates the subsample without replacement.- 参数:
random
- the random number generator to useorigSize
- the original size of the datasetsampleSize
- the size to generateactualClasses
- the number of classes found in the dataclassIndices
- the indices where classes start
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getRevision
Returns the revision string.- 指定者:
getRevision
在接口中RevisionHandler
- 覆盖:
getRevision
在类中Filter
- 返回:
- the revision
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main
Main method for testing this class.- 参数:
argv
- should contain arguments to the filter: use -h for help
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