bftree.html

数据挖掘的最常用工具。由于开源

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<HR>

<A NAME="buildClassifier(weka.core.Instances)"><!-- --></A><H3>
buildClassifier</H3>
<PRE>
public void <B>buildClassifier</B>(<A HREF="../../../weka/core/Instances.html" title="class in weka.core">Instances</A>&nbsp;data)
                     throws java.lang.Exception</PRE>
<DL>
<DD>Method for building a BestFirst decision tree classifier.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/classifiers/Classifier.html#buildClassifier(weka.core.Instances)">buildClassifier</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/Classifier.html" title="class in weka.classifiers">Classifier</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - set of instances serving as training data
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if decision tree cannot be built successfully</DL>
</DD>
</DL>
<HR>

<A NAME="distributionForInstance(weka.core.Instance)"><!-- --></A><H3>
distributionForInstance</H3>
<PRE>
public double[] <B>distributionForInstance</B>(<A HREF="../../../weka/core/Instance.html" title="class in weka.core">Instance</A>&nbsp;instance)
                                 throws java.lang.Exception</PRE>
<DL>
<DD>Computes class probabilities for instance using the decision tree.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/Classifier.html#distributionForInstance(weka.core.Instance)">distributionForInstance</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/Classifier.html" title="class in weka.classifiers">Classifier</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>instance</CODE> - the instance for which class probabilities is to be computed
<DT><B>Returns:</B><DD>the class probabilities for the given instance
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if something goes wrong</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Prints the decision tree using the protected toString method from below.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a textual description of the classifier</DL>
</DD>
</DL>
<HR>

<A NAME="numNodes()"><!-- --></A><H3>
numNodes</H3>
<PRE>
public int <B>numNodes</B>()</PRE>
<DL>
<DD>Compute size of the tree.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>size of the tree</DL>
</DD>
</DL>
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<A NAME="numLeaves()"><!-- --></A><H3>
numLeaves</H3>
<PRE>
public int <B>numLeaves</B>()</PRE>
<DL>
<DD>Compute number of leaf nodes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>number of leaf nodes</DL>
</DD>
</DL>
<HR>

<A NAME="listOptions()"><!-- --></A><H3>
listOptions</H3>
<PRE>
public java.util.Enumeration <B>listOptions</B>()</PRE>
<DL>
<DD>Returns an enumeration describing the available options.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/OptionHandler.html#listOptions()">listOptions</A></CODE> in interface <CODE><A HREF="../../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/RandomizableClassifier.html#listOptions()">listOptions</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/RandomizableClassifier.html" title="class in weka.classifiers">RandomizableClassifier</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>an enumeration describing the available options.</DL>
</DD>
</DL>
<HR>

<A NAME="setOptions(java.lang.String[])"><!-- --></A><H3>
setOptions</H3>
<PRE>
public void <B>setOptions</B>(java.lang.String[]&nbsp;options)
                throws java.lang.Exception</PRE>
<DL>
<DD>Parses the options for this object. <p/>

   <!-- options-start -->
 Valid options are: <p/>
 
 <pre> -S &lt;num&gt;
  Random number seed.
  (default 1)</pre>
 
 <pre> -D
  If set, classifier is run in debug mode and
  may output additional info to the console</pre>
 
 <pre> -P &lt;UNPRUNED|POSTPRUNED|PREPRUNED&gt;
  The pruning strategy.
  (default: POSTPRUNED)</pre>
 
 <pre> -M &lt;min no&gt;
  The minimal number of instances at the terminal nodes.
  (default 2)</pre>
 
 <pre> -N &lt;num folds&gt;
  The number of folds used in the pruning.
  (default 5)</pre>
 
 <pre> -H
  Don't use heuristic search for nominal attributes in multi-class
  problem (default yes).
 </pre>
 
 <pre> -G
  Don't use Gini index for splitting (default yes),
  if not information is used.</pre>
 
 <pre> -R
  Don't use error rate in internal cross-validation (default yes), 
  but root mean squared error.</pre>
 
 <pre> -A
  Use the 1 SE rule to make pruning decision.
  (default no).</pre>
 
 <pre> -C
  Percentage of training data size (0-1]
  (default 1).</pre>
 
   <!-- options-end -->
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/OptionHandler.html#setOptions(java.lang.String[])">setOptions</A></CODE> in interface <CODE><A HREF="../../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/RandomizableClassifier.html#setOptions(java.lang.String[])">setOptions</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/RandomizableClassifier.html" title="class in weka.classifiers">RandomizableClassifier</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>options</CODE> - the options to use
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if setting of options fails</DL>
</DD>
</DL>
<HR>

<A NAME="getOptions()"><!-- --></A><H3>
getOptions</H3>
<PRE>
public java.lang.String[] <B>getOptions</B>()</PRE>
<DL>
<DD>Gets the current settings of the Classifier.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/OptionHandler.html#getOptions()">getOptions</A></CODE> in interface <CODE><A HREF="../../../weka/core/OptionHandler.html" title="interface in weka.core">OptionHandler</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../weka/classifiers/RandomizableClassifier.html#getOptions()">getOptions</A></CODE> in class <CODE><A HREF="../../../weka/classifiers/RandomizableClassifier.html" title="class in weka.classifiers">RandomizableClassifier</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the current settings of the Classifier</DL>
</DD>
</DL>
<HR>

<A NAME="enumerateMeasures()"><!-- --></A><H3>
enumerateMeasures</H3>
<PRE>
public java.util.Enumeration <B>enumerateMeasures</B>()</PRE>
<DL>
<DD>Return an enumeration of the measure names.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/AdditionalMeasureProducer.html#enumerateMeasures()">enumerateMeasures</A></CODE> in interface <CODE><A HREF="../../../weka/core/AdditionalMeasureProducer.html" title="interface in weka.core">AdditionalMeasureProducer</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>an enumeration of the measure names</DL>
</DD>
</DL>
<HR>

<A NAME="measureTreeSize()"><!-- --></A><H3>
measureTreeSize</H3>
<PRE>
public double <B>measureTreeSize</B>()</PRE>
<DL>
<DD>Return number of tree size.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>number of tree size</DL>
</DD>
</DL>
<HR>

<A NAME="getMeasure(java.lang.String)"><!-- --></A><H3>
getMeasure</H3>
<PRE>
public double <B>getMeasure</B>(java.lang.String&nbsp;additionalMeasureName)</PRE>
<DL>
<DD>Returns the value of the named measure
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../weka/core/AdditionalMeasureProducer.html#getMeasure(java.lang.String)">getMeasure</A></CODE> in interface <CODE><A HREF="../../../weka/core/AdditionalMeasureProducer.html" title="interface in weka.core">AdditionalMeasureProducer</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>additionalMeasureName</CODE> - the name of the measure to query for its value
<DT><B>Returns:</B><DD>the value of the named measure
<DT><B>Throws:</B>
<DD><CODE>java.lang.IllegalArgumentException</CODE> - if the named measure is not supported</DL>
</DD>
</DL>
<HR>

<A NAME="pruningStrategyTipText()"><!-- --></A><H3>
pruningStrategyTipText</H3>
<PRE>
public java.lang.String <B>pruningStrategyTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>tip text for this property suitable for
                        displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setPruningStrategy(weka.core.SelectedTag)"><!-- --></A><H3>
setPruningStrategy</H3>
<PRE>
public void <B>setPruningStrategy</B>(<A HREF="../../../weka/core/SelectedTag.html" title="class in weka.core">SelectedTag</A>&nbsp;value)</PRE>
<DL>
<DD>Sets the pruning strategy.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the strategy</DL>
</DD>
</DL>
<HR>

<A NAME="getPruningStrategy()"><!-- --></A><H3>
getPruningStrategy</H3>
<PRE>
public <A HREF="../../../weka/core/SelectedTag.html" title="class in weka.core">SelectedTag</A> <B>getPruningStrategy</B>()</PRE>
<DL>
<DD>Gets the pruning strategy.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the current strategy.</DL>
</DD>
</DL>
<HR>

<A NAME="minNumObjTipText()"><!-- --></A><H3>
minNumObjTipText</H3>
<PRE>
public java.lang.String <B>minNumObjTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>tip text for this property suitable for
                        displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setMinNumObj(int)"><!-- --></A><H3>
setMinNumObj</H3>
<PRE>
public void <B>setMinNumObj</B>(int&nbsp;value)</PRE>
<DL>
<DD>Set minimal number of instances at the terminal nodes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - minimal number of instances at the terminal nodes</DL>
</DD>
</DL>
<HR>

<A NAME="getMinNumObj()"><!-- --></A><H3>
getMinNumObj</H3>
<PRE>
public int <B>getMinNumObj</B>()</PRE>
<DL>
<DD>Get minimal number of instances at the terminal nodes.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>minimal number of instances at the terminal nodes</DL>
</DD>
</DL>
<HR>

<A NAME="numFoldsPruningTipText()"><!-- --></A><H3>
numFoldsPruningTipText</H3>
<PRE>
public java.lang.String <B>numFoldsPruningTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>tip text for this property suitable for
                        displaying in the explorer/experimenter gui</DL>
</DD>
</DL>
<HR>

<A NAME="setNumFoldsPruning(int)"><!-- --></A><H3>
setNumFoldsPruning</H3>
<PRE>
public void <B>setNumFoldsPruning</B>(int&nbsp;value)</PRE>
<DL>
<DD>Set number of folds in internal cross-validation.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>