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java.lang.Objectweka.filters.Filter
weka.filters.unsupervised.attribute.PrincipalComponents
public class PrincipalComponents
Performs a principal components analysis and transformation of the data.
Dimensionality reduction is accomplished by choosing enough eigenvectors to account for some percentage of the variance in the original data -- default 0.95 (95%).
Based on code of the attribute selection scheme 'PrincipalComponents' by Mark Hall and Gabi Schmidberger.
-D Don't normalize input data.
-R <num> Retain enough PC attributes to account for this proportion of variance in the original data. (default: 0.95)
-A <num> Maximum number of attributes to include in transformed attribute names. (-1 = include all, default: 5)
-M <num> Maximum number of PC attributes to retain. (-1 = include all, default: -1)
Constructor Summary | |
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PrincipalComponents()
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Method Summary | |
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boolean |
batchFinished()
Signify that this batch of input to the filter is finished. |
java.lang.String |
centerDataTipText()
Returns the tip text for this property |
Capabilities |
getCapabilities()
Returns the capabilities of this evaluator. |
boolean |
getCenterData()
Get whether to center (rather than standardize) the data. |
int |
getMaximumAttributeNames()
Gets maximum number of attributes to include in transformed attribute names. |
int |
getMaximumAttributes()
Gets maximum number of PC attributes to retain. |
java.lang.String[] |
getOptions()
Gets the current settings of the filter. |
java.lang.String |
getRevision()
Returns the revision string. |
double |
getVarianceCovered()
Gets the proportion of total variance to account for when retaining principal components. |
java.lang.String |
globalInfo()
Returns a string describing this filter. |
boolean |
input(Instance instance)
Input an instance for filtering. |
java.util.Enumeration |
listOptions()
Returns an enumeration describing the available options. |
static void |
main(java.lang.String[] args)
Main method for running this filter. |
java.lang.String |
maximumAttributeNamesTipText()
Returns the tip text for this property. |
java.lang.String |
maximumAttributesTipText()
Returns the tip text for this property. |
void |
setCenterData(boolean center)
Set whether to center (rather than standardize) the data. |
boolean |
setInputFormat(Instances instanceInfo)
Sets the format of the input instances. |
void |
setMaximumAttributeNames(int value)
Sets maximum number of attributes to include in transformed attribute names. |
void |
setMaximumAttributes(int value)
Sets maximum number of PC attributes to retain. |
void |
setOptions(java.lang.String[] options)
Parses a list of options for this object. |
void |
setVarianceCovered(double value)
Sets the amount of variance to account for when retaining principal components. |
java.lang.String |
varianceCoveredTipText()
Returns the tip text for this property. |
Methods inherited from class weka.filters.Filter |
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batchFilterFile, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public PrincipalComponents()
Method Detail |
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public java.lang.String globalInfo()
public java.util.Enumeration listOptions()
listOptions
in interface OptionHandler
public void setOptions(java.lang.String[] options) throws java.lang.Exception
-D Don't normalize input data.
-R <num> Retain enough PC attributes to account for this proportion of variance in the original data. (default: 0.95)
-A <num> Maximum number of attributes to include in transformed attribute names. (-1 = include all, default: 5)
-M <num> Maximum number of PC attributes to retain. (-1 = include all, default: -1)
setOptions
in interface OptionHandler
options
- the list of options as an array of strings
java.lang.Exception
- if an option is not supportedpublic java.lang.String[] getOptions()
getOptions
in interface OptionHandler
public java.lang.String centerDataTipText()
public void setCenterData(boolean center)
center
- true if the data is to be
centered rather than standardizedpublic boolean getCenterData()
public java.lang.String varianceCoveredTipText()
public void setVarianceCovered(double value)
value
- the proportion of total variance to account forpublic double getVarianceCovered()
public java.lang.String maximumAttributeNamesTipText()
public void setMaximumAttributeNames(int value)
value
- the maximum number of attributespublic int getMaximumAttributeNames()
public java.lang.String maximumAttributesTipText()
public void setMaximumAttributes(int value)
value
- the maximum number of attributespublic int getMaximumAttributes()
public Capabilities getCapabilities()
getCapabilities
in interface CapabilitiesHandler
getCapabilities
in class Filter
Capabilities
public boolean setInputFormat(Instances instanceInfo) throws java.lang.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).
java.lang.Exception
- if the input format can't be set successfullypublic boolean input(Instance instance) throws java.lang.Exception
input
in class Filter
instance
- the input instance
java.lang.IllegalStateException
- if no input format has been set
java.lang.Exception
- if conversion failspublic boolean batchFinished() throws java.lang.Exception
batchFinished
in class Filter
java.lang.NullPointerException
- if no input structure has been defined,
java.lang.Exception
- if there was a problem finishing the batch.public java.lang.String getRevision()
getRevision
in interface RevisionHandler
getRevision
in class Filter
public static void main(java.lang.String[] args)
args
- should contain arguments to the filter: use -h for help
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