我有pmml格式的决策树模型，如下所示。如何以文本或其他格式保存每个叶子的规则？
例如：uniformitycellsize＆lt; = 3.5 ^ clumpthickness＆lt; = 6.5 ^ normalnucleoli＆gt; = 3.5 =＆gt; B
<TreeModel modelName="DecisionTree" functionName="classification" splitCharacteristic="binarySplit" missingValueStrategy="lastPrediction" noTrueChildStrategy="returnNullPrediction">
<MiningSchema>
<MiningField name="clumpthickness" invalidValueTreatment="asIs"/>
<MiningField name="uniformitycellsize" invalidValueTreatment="asIs"/>
<MiningField name="uniformitycellshape" invalidValueTreatment="asIs"/>
<MiningField name="marginaladhesion" invalidValueTreatment="asIs"/>
<MiningField name="epithelialcellsize" invalidValueTreatment="asIs"/>
<MiningField name="barenuclei" invalidValueTreatment="asIs"/>
<MiningField name="blandchromatin" invalidValueTreatment="asIs"/>
<MiningField name="normalnucleoli" invalidValueTreatment="asIs"/>
<MiningField name="mitoses" invalidValueTreatment="asIs"/>
<MiningField name="partition" invalidValueTreatment="asIs"/>
<MiningField name="Class_Categorical" invalidValueTreatment="asIs" usageType="target"/>
</MiningSchema>
<Node id="0" score="B" recordCount="559.0">
<True/>
<ScoreDistribution value="B" recordCount="365.0"/>
<ScoreDistribution value="M" recordCount="194.0"/>
<Node id="1" score="B" recordCount="384.0">
<SimplePredicate field="uniformitycellsize" operator="lessOrEqual" value="3.5"/>
<ScoreDistribution value="B" recordCount="356.0"/>
<ScoreDistribution value="M" recordCount="28.0"/>
<Node id="2" score="B" recordCount="368.0">
<SimplePredicate field="clumpthickness" operator="lessOrEqual" value="6.5"/>
<ScoreDistribution value="B" recordCount="354.0"/>
<ScoreDistribution value="M" recordCount="14.0"/>
<Node id="3" score="B" recordCount="353.0">
<SimplePredicate field="normalnucleoli" operator="lessOrEqual" value="3.5"/>
<ScoreDistribution value="B" recordCount="347.0"/>
<ScoreDistribution value="M" recordCount="6.0"/>
</Node>
<Node id="10" score="M" recordCount="15.0">
<SimplePredicate field="normalnucleoli" operator="greaterThan" value="3.5"/>
<ScoreDistribution value="B" recordCount="7.0"/>
<ScoreDistribution value="M" recordCount="8.0"/>
</Node>
</Node>
<Node id="11" score="M" recordCount="16.0">
<SimplePredicate field="clumpthickness" operator="greaterThan" value="6.5"/>
<ScoreDistribution value="B" recordCount="2.0"/>
<ScoreDistribution value="M" recordCount="14.0"/>
</Node>
</Node>
<Node id="12" score="M" recordCount="175.0">
<SimplePredicate field="uniformitycellsize" operator="greaterThan" value="3.5"/>
<ScoreDistribution value="B" recordCount="9.0"/>
<ScoreDistribution value="M" recordCount="166.0"/>
<Node id="13" score="M" recordCount="33.0">
<SimplePredicate field="uniformitycellsize" operator="lessOrEqual" value="4.5"/>
<ScoreDistribution value="B" recordCount="7.0"/>
<ScoreDistribution value="M" recordCount="26.0"/>
<Node id="14" score="M" recordCount="21.0">
<SimplePredicate field="marginaladhesion" operator="lessOrEqual" value="5.5"/>
<ScoreDistribution value="B" recordCount="7.0"/>
<ScoreDistribution value="M" recordCount="14.0"/>
<Node id="15" score="B" recordCount="10.0">
<SimplePredicate field="clumpthickness" operator="lessOrEqual" value="7.5"/>
<ScoreDistribution value="B" recordCount="6.0"/>
<ScoreDistribution value="M" recordCount="4.0"/>
</Node>
<Node id="16" score="M" recordCount="11.0">
<SimplePredicate field="clumpthickness" operator="greaterThan" value="7.5"/>
<ScoreDistribution value="B" recordCount="1.0"/>
<ScoreDistribution value="M" recordCount="10.0"/>
</Node>
</Node>
<Node id="17" score="M" recordCount="12.0">
<SimplePredicate field="marginaladhesion" operator="greaterThan" value="5.5"/>
<ScoreDistribution value="B" recordCount="0.0"/>
<ScoreDistribution value="M" recordCount="12.0"/>
</Node>
</Node>
<Node id="18" score="M" recordCount="142.0">
<SimplePredicate field="uniformitycellsize" operator="greaterThan" value="4.5"/>
<ScoreDistribution value="B" recordCount="2.0"/>
<ScoreDistribution value="M" recordCount="140.0"/>
</Node>
</Node>
</Node>
</TreeModel>
=============================================== ============================ 用于实现此类结果的xsl样式表如下所示。
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text" encoding="UTF-8"/>
<xsl:template match="/">
<xsl:for-each select="//Node[not(Node)]">
<xsl:for-each select="ancestor-or-self::Node/SimplePredicate">
<xsl:value-of select="@field"/>
<xsl:choose>
<xsl:when test="@operator = 'lessOrEqual'"> <= </xsl:when>
<xsl:when test="@operator = 'greaterThan'"> > </xsl:when>
</xsl:choose>
<xsl:value-of select="@value"/>
<xsl:if test="position() != last()">
<xsl:text> ^ </xsl:text>
</xsl:if>
<xsl:if test="position() = last()">
<xsl:text> => </xsl:text>
<xsl:value-of select="../@score"/>
</xsl:if>
</xsl:for-each>
<xsl:text> </xsl:text>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
结果是：
Uniformity of Cell Size <= 2.5 ^ Bare Nuclei <= 5.5 => B
Uniformity of Cell Size <= 2.5 ^ Bare Nuclei > 5.5 => M
Uniformity of Cell Size > 2.5 ^ Uniformity of Cell Shape <= 2.5 ^ Clump Thickness <= 5.5 => B
Uniformity of Cell Size > 2.5 ^ Uniformity of Cell Shape <= 2.5 ^ Clump Thickness > 5.5 => M
Uniformity of Cell Size > 2.5 ^ Uniformity of Cell Shape > 2.5 => M
答案 0 :(得分：1)
在XSLT中，您可以执行以下操作：
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text" encoding="UTF-8"/>
<xsl:template match="/">
<xsl:for-each select="//Node[not(Node)]/ScoreDistribution">
<xsl:for-each select="ancestor::Node/SimplePredicate">
<xsl:value-of select="@field"/>
<xsl:choose>
<xsl:when test="@operator = 'lessOrEqual'"> <= </xsl:when>
<xsl:when test="@operator = 'greaterThan'"> > </xsl:when>
</xsl:choose>
<xsl:value-of select="@value"/>
<xsl:if test="position() != last()">
<xsl:text> ^ </xsl:text>
</xsl:if>
</xsl:for-each>
<xsl:text> => </xsl:text>
<xsl:value-of select="@value"/>
<xsl:text> (</xsl:text>
<xsl:value-of select="@recordCount"/>
<xsl:text>) </xsl:text>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
应用于您的输入示例，结果将是：
uniformitycellsize <= 3.5 ^ clumpthickness <= 6.5 ^ normalnucleoli <= 3.5 => B (347.0)
uniformitycellsize <= 3.5 ^ clumpthickness <= 6.5 ^ normalnucleoli <= 3.5 => M (6.0)
uniformitycellsize <= 3.5 ^ clumpthickness <= 6.5 ^ normalnucleoli > 3.5 => B (7.0)
uniformitycellsize <= 3.5 ^ clumpthickness <= 6.5 ^ normalnucleoli > 3.5 => M (8.0)
uniformitycellsize <= 3.5 ^ clumpthickness > 6.5 => B (2.0)
uniformitycellsize <= 3.5 ^ clumpthickness > 6.5 => M (14.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion <= 5.5 ^ clumpthickness <= 7.5 => B (6.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion <= 5.5 ^ clumpthickness <= 7.5 => M (4.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion <= 5.5 ^ clumpthickness > 7.5 => B (1.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion <= 5.5 ^ clumpthickness > 7.5 => M (10.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion > 5.5 => B (0.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion > 5.5 => M (12.0)
uniformitycellsize > 3.5 ^ uniformitycellsize > 4.5 => B (2.0)
uniformitycellsize > 3.5 ^ uniformitycellsize > 4.5 => M (140.0)
或者，如果您愿意：
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text" encoding="UTF-8"/>
<xsl:template match="/">
<xsl:for-each select="//Node[not(Node)]">
<xsl:for-each select="ancestor-or-self::Node/SimplePredicate">
<xsl:value-of select="@field"/>
<xsl:choose>
<xsl:when test="@operator = 'lessOrEqual'"> <= </xsl:when>
<xsl:when test="@operator = 'greaterThan'"> > </xsl:when>
</xsl:choose>
<xsl:value-of select="@value"/>
<xsl:if test="position() != last()">
<xsl:text> ^ </xsl:text>
</xsl:if>
</xsl:for-each>
<xsl:text> => </xsl:text>
<xsl:for-each select="ScoreDistribution">
<xsl:value-of select="@value"/>
<xsl:text> (</xsl:text>
<xsl:value-of select="@recordCount"/>
<xsl:text>)</xsl:text>
<xsl:if test="position() != last()">
<xsl:text>; </xsl:text>
</xsl:if>
</xsl:for-each>
<xsl:text> </xsl:text>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
生产：
uniformitycellsize <= 3.5 ^ clumpthickness <= 6.5 ^ normalnucleoli <= 3.5 => B (347.0); M (6.0)
uniformitycellsize <= 3.5 ^ clumpthickness <= 6.5 ^ normalnucleoli > 3.5 => B (7.0); M (8.0)
uniformitycellsize <= 3.5 ^ clumpthickness > 6.5 => B (2.0); M (14.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion <= 5.5 ^ clumpthickness <= 7.5 => B (6.0); M (4.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion <= 5.5 ^ clumpthickness > 7.5 => B (1.0); M (10.0)
uniformitycellsize > 3.5 ^ uniformitycellsize <= 4.5 ^ marginaladhesion > 5.5 => B (0.0); M (12.0)
uniformitycellsize > 3.5 ^ uniformitycellsize > 4.5 => B (2.0); M (140.0)
答案 1 :(得分：0)
您可以编写一个xpath来从xml中获取叶子，并根据获得的信息构造对象。
例如，normalnucleoli的Xpath将是：//*[@field][@field='normalnucleoli']/@value
java中使用上述xpath的示例代码将是：
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse( new File( TreeModelXmlFile ) );
XPathFactory xPathFactory = XPathFactory.newInstance();
XPath xpath = xPathFactory.newXPath();
String fieldToExtract = "normalnucleoli";
String normalNucleoliValue = "";
XPathExpression expr = xpath.compile( "//*[@field][@field='" + fieldToExtract + "']/@value" );
Object exprEval = expr.evaluate( doc, XPathConstants.NODESET );
if ( exprEval != null && exprEval instanceof NodeList )
{
NodeList nodeList = (NodeList)exprEval;
if ( nodeList.getLength() > 0 )
{
normalNucleoliValue = nodeList.get(0).getTextContent();
}
}
String operator = "";
expr = xpath.compile( ""//*[@field][@field='" + fieldToExtract + "']/@operator"");
Object exprEval = expr.evaluate( doc, XPathConstants.NODESET );
if ( exprEval != null && exprEval instanceof NodeList )
{
NodeList nodeList = (NodeList)exprEval;
if ( nodeList.getLength() > 0 )
{
operator = nodeList.get(0).getTextContent();
}
}
System.out.println( fieldToExtract + " " + operator + " " + normalNucleoliValue );
OR
您可以使用JAXB编写unmarshaller以将xml转换为java对象。你需要一个架构。