Question

我运行线性回归代码并生成一个pmml。在我的pmml代码中有数据类型和回归表信息。我有像这样的pmml代码

 <?xml version="1.0" encoding="utf-8" standalone="yes"?>
  <PMML version="4.2"
   xmlns="http://www.dmg.org/PMML-4_2"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <Header>
    <Application name="SAS(r)" version="9.4"/>
    <Timestamp>2016-05-27 09:58:01</Timestamp>
    </Header>
    <DataDictionary numberOfFields="10">
      <DataField name="Invoice" optype="continuous" dataType="double"/>
      <DataField name="ZINT_Cylinders" optype="continuous" dataType="double"/>
      <DataField name="ZINT_EngineSize" optype="continuous" dataType="double"/>
    </DataDictionary>
    <TransformationDictionary/>
    <RegressionModel functionName="regression" targetFieldName="Invoice" normalizationMethod="none">
      <MiningSchema>
        <MiningField name="ZINT_Cylinders" usageType="active" optype="continuous"/>
        <MiningField name="ZINT_EngineSize" usageType="active" optype="continuous"/>
      </MiningSchema>
      <Output>
        <OutputField name="P_Invoice" displayName="Predicted: Invoice" optype="continuous" dataType="double" targetField="Invoice" feature="predictedValue"/>
      </Output>
      <Targets>
        <Target field="Invoice" optype="continuous">
          <TargetValue defaultValue="30014.700935"/>
        </Target>
      </Targets>
      <LocalTransformations/>
      <RegressionTable intercept="-4919.70174">
        <NumericPredictor name="ZINT_Cylinders" coefficient="-0.007378626"/>
        <NumericPredictor name="ZINT_EngineSize" coefficient="-0.147331595"/>
      </RegressionTable>
    </RegressionModel>
  </PMML>

在回归步骤之前，我想转换我的源数据。例如，我想将这些case when structure添加到我的pmml中。有可能这样做吗？

SELECT Invoice,
    CASE
        WHEN EngineSize < 2.9 THEN 20304.5142857143
        WHEN EngineSize < 4.1 THEN 30378.8789808917
        WHEN EngineSize >= 4.1 THEN 47119.9791666667
        ELSE 30014.7009345794 
    END AS ZINT_EngineSize,
    CASE
        WHEN Cylinders < 4.5 THEN 18349.4452554745
        WHEN Cylinders < 7 THEN 29472.3819095477
        WHEN Cylinders >= 7 THEN 48558.847826087
        ELSE 30014.7009345794 
    END AS ZINT_Cylinders
FROM MYSOURCE.MYTABLE;

Answer 1

您可以使用Discretize transformation作业：

<DerivedField name="ZINT_EngineSize" dataType="double" optype="continuous">
  <Discretize field="EngineSize">
    <DiscretizeBin binValue="20304.5142857143">
      <!-- EngineSize < 2.9 -->
      <Interval closure="openOpen" rightMargin="2.9"/>
    </DiscretizeBin>
    <DiscretizeBin binValue="30378.8789808917">
      <!-- EngineSize >= 2.9 && EngineSize < 4.1 -->
      <Interval closure="closedOpen" leftMargin="2.9" rightMargin="4.1"/>
    </DiscretizeBin>
    <DiscretizeBin binValue="47119.9791666667">
      <!-- EngineSize >= 4.1 -->
      <Interval closure="closedOpen" leftMargin="4.1"/>
    </DiscretizeBin>
  </Discretize>
</DerivedField>

您可以为SAS脚本构建解析器，并使用JPMML-Model library自动生成和嵌入Discretize元素。

是否可以将转换代码添加到pmml？

1 个答案: