EDOBE XDOM PMML Manual de usuario descargar pdf (Pagina 23)

Column Filter

Generator

Some nodes are able to create a Filter Columns node where the

columns selected are determined based upon the node’s

computational results. These include Correlations, Linear

Regression, and Regression Tree.

The node supports this functionality by implementing the

ColumnFilterGenerator interface. This interface has a single

method:

public String[] getFilterColumnsToExclude()

This method returns an array of the columns that the filter should

exclude. Useful helper tools are available in the

ColumnFilterTools

class. In particular, this class provides support for launching the

standard Column Filter Specification dialog.

PMML Generator The model nodes built into Spotfire Miner are all able to create a

Predictive Model Markup Language (PMML) description of their

model. PMML is an XML standard for describing data mining

models. For models such as Principal Components that don’t have

a definition in PMML, an alternate XML description is produced.

A node indicates that it supports PMML generation by implementing

the

PMMLGenerator interface. This interface has a single method:

void writePMML(FileOutputStream str)

The PMML generation in Spotfire Miner is typically performed by

taking the XML representation of the model and transforming it

using XSL. This is done using the

applyXSLTransform() method in

XMLTree.

Predictable Node

Model

Model nodes such as Linear Regression can generate a Predict

node that can get predicted values for new data. These nodes extend

PredictableNodeModel. An object of this type can be used in the

constructor for a Predict node.

Currently, the Predict node classes have a lot of knowledge in their

methods regarding how to predict for the various kinds of models. As

this information is in the Predict node rather than the specific

model’s classes, it isn’t possibly to add a new model without adding

new code to the

PredictEngineNode and PredictNodeModel. In the

future we may change these methods to use reflection and invoke

code in the specific model classes.

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EDOBE XDOM PMML Manual de usuario Pagina 23