bestfirst.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

<PRE>
public static final <A HREF="../../weka/core/Tag.html">Tag</A>[] <B>TAGS_SELECTION</B></PRE>
<DL>
</DL>

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<B>Constructor Detail</B></FONT></TD>
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<A NAME="BestFirst()"><!-- --></A><H3>
BestFirst</H3>
<PRE>
public <B>BestFirst</B>()</PRE>
<DL>
<DD>Constructor</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="globalInfo()"><!-- --></A><H3>
globalInfo</H3>
<PRE>
public java.lang.String <B>globalInfo</B>()</PRE>
<DL>
<DD>Returns a string describing this search method<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>a description of the search method suitable for
 displaying in the explorer/experimenter gui</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>

 -D <-1 = backward | 0 = bidirectional | 1 = forward> <br>
 Direction of the search. (default = 1). <p>

 -N <num> <br>
 Number of non improving nodes to consider before terminating search.
 (default = 5). <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="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="searchTerminationTipText()"><!-- --></A><H3>
searchTerminationTipText</H3>
<PRE>
public java.lang.String <B>searchTerminationTipText</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="setSearchTermination(int)"><!-- --></A><H3>
setSearchTermination</H3>
<PRE>
public void <B>setSearchTermination</B>(int&nbsp;t)
                          throws java.lang.Exception</PRE>
<DL>
<DD>Set the numnber of non-improving nodes to consider before terminating
 search.<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>t</CODE> - the number of non-improving nodes<DT><B>Throws:</B><DD><CODE>java.lang.Exception</CODE> - if t is less than 1</DL>
</DD>
</DL>
<HR>

<A NAME="getSearchTermination()"><!-- --></A><H3>
getSearchTermination</H3>
<PRE>
public int <B>getSearchTermination</B>()</PRE>
<DL>
<DD>Get the termination criterion (number of non-improving nodes).<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the number of non-improving nodes</DL>
</DD>
</DL>
<HR>

<A NAME="directionTipText()"><!-- --></A><H3>
directionTipText</H3>
<PRE>
public java.lang.String <B>directionTipText</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="setDirection(weka.core.SelectedTag)"><!-- --></A><H3>
setDirection</H3>
<PRE>
public void <B>setDirection</B>(<A HREF="../../weka/core/SelectedTag.html">SelectedTag</A>&nbsp;d)</PRE>
<DL>
<DD>Set the search direction<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>d</CODE> - the direction of the search</DL>
</DD>
</DL>
<HR>

<A NAME="getDirection()"><!-- --></A><H3>
getDirection</H3>
<PRE>
public <A HREF="../../weka/core/SelectedTag.html">SelectedTag</A> <B>getDirection</B>()</PRE>
<DL>
<DD>Get the search direction<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the direction of the search</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 BestFirst.<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="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="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>Searches the attribute subset space by best first search<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="resetOptions()"><!-- --></A><H3>
resetOptions</H3>
<PRE>
protected void <B>resetOptions</B>()</PRE>
<DL>
<DD>Reset options to default values<DD><DL>
</DL>
</DD>
</DL>
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