ranker.html

< 数据挖掘--实用机器学习技术及java实现> 一书结合数据挖掘和机器学习的知识,作者陈述了自动挖掘模式的基础理论,并且以java语言实现了具有代表性的各类数据挖掘方法.例如:class

<A NAME="numToSelectTipText()"><!-- --></A><H3>
numToSelectTipText</H3>
<PRE>
public java.lang.String <B>numToSelectTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<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="setNumToSelect(int)"><!-- --></A><H3>
setNumToSelect</H3>
<PRE>
public void <B>setNumToSelect</B>(int&nbsp;n)</PRE>
<DL>
<DD>Specify the number of attributes to select from the ranked list. -1
 indicates that all attributes are to be retained.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#setNumToSelect(int)">setNumToSelect</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the number of attributes to retain</DL>
</DD>
</DL>
<HR>

<A NAME="getNumToSelect()"><!-- --></A><H3>
getNumToSelect</H3>
<PRE>
public int <B>getNumToSelect</B>()</PRE>
<DL>
<DD>Gets the number of attributes to be retained.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#getNumToSelect()">getNumToSelect</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of attributes to retain</DL>
</DD>
</DL>
<HR>

<A NAME="getCalculatedNumToSelect()"><!-- --></A><H3>
getCalculatedNumToSelect</H3>
<PRE>
public int <B>getCalculatedNumToSelect</B>()</PRE>
<DL>
<DD>Gets the calculated number to select. This might be computed
 from a threshold, or if < 0 is set as the number to select then
 it is set to the number of attributes in the (transformed) data.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#getCalculatedNumToSelect()">getCalculatedNumToSelect</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the calculated number of attributes to select</DL>
</DD>
</DL>
<HR>

<A NAME="thresholdTipText()"><!-- --></A><H3>
thresholdTipText</H3>
<PRE>
public java.lang.String <B>thresholdTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<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="setThreshold(double)"><!-- --></A><H3>
setThreshold</H3>
<PRE>
public void <B>setThreshold</B>(double&nbsp;threshold)</PRE>
<DL>
<DD>Set the threshold by which the AttributeSelection module can discard
 attributes.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#setThreshold(double)">setThreshold</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>threshold</CODE> - the threshold.</DL>
</DD>
</DL>
<HR>

<A NAME="getThreshold()"><!-- --></A><H3>
getThreshold</H3>
<PRE>
public double <B>getThreshold</B>()</PRE>
<DL>
<DD>Returns the threshold so that the AttributeSelection module can
 discard attributes from the ranking.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#getThreshold()">getThreshold</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD>Following copied from interface: <CODE>weka.attributeSelection.RankedOutputSearch</CODE></DD>
<DD><DL>
<DT><B>Returns:</B><DD>a threshold by which to discard attributes</DL>
</DD>
</DL>
<HR>

<A NAME="generateRankingTipText()"><!-- --></A><H3>
generateRankingTipText</H3>
<PRE>
public java.lang.String <B>generateRankingTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<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="setGenerateRanking(boolean)"><!-- --></A><H3>
setGenerateRanking</H3>
<PRE>
public void <B>setGenerateRanking</B>(boolean&nbsp;doRank)</PRE>
<DL>
<DD>This is a dummy set method---Ranker is ONLY capable of producing
 a ranked list of attributes for attribute evaluators.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#setGenerateRanking(boolean)">setGenerateRanking</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>doRank</CODE> - this parameter is N/A and is ignored</DL>
</DD>
</DL>
<HR>

<A NAME="getGenerateRanking()"><!-- --></A><H3>
getGenerateRanking</H3>
<PRE>
public boolean <B>getGenerateRanking</B>()</PRE>
<DL>
<DD>This is a dummy method. Ranker can ONLY be used with attribute
 evaluators and as such can only produce a ranked list of attributes<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#getGenerateRanking()">getGenerateRanking</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>true all the time.</DL>
</DD>
</DL>
<HR>

<A NAME="startSetTipText()"><!-- --></A><H3>
startSetTipText</H3>
<PRE>
public java.lang.String <B>startSetTipText</B>()</PRE>
<DL>
<DD>Returns the tip text for this property<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="setStartSet(java.lang.String)"><!-- --></A><H3>
setStartSet</H3>
<PRE>
public void <B>setStartSet</B>(java.lang.String&nbsp;startSet)
                 throws java.lang.Exception</PRE>
<DL>
<DD>Sets a starting set of attributes for the search. It is the
 search method's responsibility to report this start set (if any)
 in its toString() method.<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/StartSetHandler.html#setStartSet(java.lang.String)">setStartSet</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/StartSetHandler.html">StartSetHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>startSet</CODE> - a string containing a list of attributes (and or ranges),
 eg. 1,2,6,10-15.<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if start set can't be set.</DL>
</DD>
</DL>
<HR>

<A NAME="getStartSet()"><!-- --></A><H3>
getStartSet</H3>
<PRE>
public java.lang.String <B>getStartSet</B>()</PRE>
<DL>
<DD>Returns a list of attributes (and or attribute ranges) as a String<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/StartSetHandler.html#getStartSet()">getStartSet</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/StartSetHandler.html">StartSetHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a list of attributes (and or attribute ranges)</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<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">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an enumeration of all 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 a given list of options.

 Valid options are: <p>

 -P <start set> <br>
 Specify a starting set of attributes. Eg 1,4,7-9. <p>

 -T <threshold> <br>
 Specify a threshold by which the AttributeSelection module can <br>
 discard attributes. <p>

 -N <number to retain> <br>
 Specify the number of attributes to retain. Overides any threshold. <br>
 <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">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>options</CODE> - the list of options as an array of strings<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if an option is not supported</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 ReliefFAttributeEval.<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">OptionHandler</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an array of strings suitable for passing to setOptions()</DL>
</DD>
</DL>
<HR>

<A NAME="search(weka.attributeSelection.ASEvaluation, weka.core.Instances)"><!-- --></A><H3>
search</H3>
<PRE>
public int[] <B>search</B>(<A HREF="../../weka/attributeSelection/ASEvaluation.html">ASEvaluation</A>&nbsp;ASEval,
                    <A HREF="../../weka/core/Instances.html">Instances</A>&nbsp;data)
             throws java.lang.Exception</PRE>
<DL>
<DD>Kind of a dummy search algorithm. Calls a Attribute evaluator to
 evaluate each attribute not included in the startSet and then sorts
 them to produce a ranked list of attributes.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../weka/attributeSelection/ASSearch.html#search(weka.attributeSelection.ASEvaluation, weka.core.Instances)">search</A></CODE> in class <CODE><A HREF="../../weka/attributeSelection/ASSearch.html">ASSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>ASEvaluator</CODE> - the attribute evaluator to guide the search<DD><CODE>data</CODE> - the training instances.<DT><B>Returns:</B><DD>an array (not necessarily ordered) of selected attribute indexes<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if the search can't be completed</DL>
</DD>
</DL>
<HR>

<A NAME="rankedAttributes()"><!-- --></A><H3>
rankedAttributes</H3>
<PRE>
public double[][] <B>rankedAttributes</B>()
                            throws java.lang.Exception</PRE>
<DL>
<DD>Sorts the evaluated attribute list<DD><DL>
<DT><B>Specified by: </B><DD><CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html#rankedAttributes()">rankedAttributes</A></CODE> in interface <CODE><A HREF="../../weka/attributeSelection/RankedOutputSearch.html">RankedOutputSearch</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>an array of sorted (highest eval to lowest) attribute indexes<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - of sorting can't be done.</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>returns a description of the search as a String<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 description of the search</DL>
</DD>
</DL>
<HR>

<A NAME="resetOptions()"><!-- --></A><H3>
resetOptions</H3>
<PRE>
protected void <B>resetOptions</B>()</PRE>
<DL>
<DD>Resets stuff to default values<DD><DL>
</DL>
</DD>
</DL>
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