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java.lang.Object | +--weka.filters.Filter | +--weka.filters.ResampleFilter
Produces a random subsample of a dataset. The original dataset must fit entirely in memory. The number of instances in the generated dataset may be specified. If the dataset has a (nominal) class attribute, 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, subsequent batches are not resampled. Valid options are:
-S num
Specify the random number seed (default 1).
-B num
Specify a bias towards uniform class distribution. 0 = distribution
in input data, 1 = uniform class distribution (default 0).
-Z percent
Specify the size of the output dataset, as a percentage of the input
dataset (default 100).
Field Summary |
Fields inherited from class weka.filters.Filter |
m_Debug, m_NewBatch |
Constructor Summary | |
ResampleFilter()
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Method Summary | |
boolean |
batchFinished()
Signify that this batch of input to the filter is finished. |
double |
getBiasToUniformClass()
Gets the bias towards a uniform class. |
String[] |
getOptions()
Gets the current settings of the filter. |
int |
getRandomSeed()
Gets the random number seed. |
double |
getSampleSizePercent()
Gets the subsample size as a percentage of the original set. |
boolean |
input(Instance instance)
Input an instance for filtering. |
Enumeration |
listOptions()
Returns an enumeration describing the available options |
static void |
main(String[] argv)
Main method for testing this class. |
void |
setBiasToUniformClass(double newBiasToUniformClass)
Sets the bias towards a uniform class. |
boolean |
setInputFormat(Instances instanceInfo)
Sets the format of the input instances. |
void |
setOptions(String[] options)
Parses a list of options for this object. |
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. |
Methods inherited from class weka.filters.Filter |
batchFilterFile, bufferInput, copyStringValues, copyStringValues, filterFile, flushInput, getInputFormat, getInputStringIndex, getOutputFormat, getOutputStringIndex, getStringIndices, inputFormat, isOutputFormatDefined, numPendingOutput, output, outputFormat, outputFormatPeek, outputPeek, push, resetQueue, setOutputFormat, useFilter |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ResampleFilter()
Method Detail |
public Enumeration listOptions()
listOptions
in interface OptionHandler
public void setOptions(String[] options) throws Exception
-S num
Specify the random number seed (default 1).
-B num
Specify a bias towards uniform class distribution. 0 = distribution
in input data, 1 = uniform class distribution (default 0).
-Z percent
Specify the size of the output dataset, as a percentage of the input
dataset (default 100).
setOptions
in interface OptionHandler
options
- the list of options as an array of strings
Exception
- if an option is not supportedpublic String[] getOptions()
getOptions
in interface OptionHandler
public double getBiasToUniformClass()
public void setBiasToUniformClass(double newBiasToUniformClass)
newBiasToUniformClass
- the new bias value, between 0 and 1.public int getRandomSeed()
public void setRandomSeed(int newSeed)
newSeed
- the new random number seed.public double getSampleSizePercent()
public void setSampleSizePercent(double newSampleSizePercent)
newSampleSizePercent
- the subsample set size, between 0 and 100.public boolean setInputFormat(Instances instanceInfo) throws Exception
setInputFormat
in class Filter
instanceInfo
- an Instances object containing the input
instance structure (any instances contained in the object are
ignored - only the structure is required).
Exception
- if the input format can't be set
successfullypublic boolean input(Instance instance)
input
in class Filter
instance
- the input instance
IllegalStateException
- if no input structure has been definedpublic boolean batchFinished()
batchFinished
in class Filter
IllegalStateException
- if no input structure has been definedpublic static void main(String[] argv)
argv
- should contain arguments to the filter:
use -h for help
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