Working with Multiple Streams: Standalone Scripts

To work with multiple streams, a standalone script must be used. The standalone script can be edited and run within the IBM® SPSS® Modeler UI or passed as a command line parameter in batch mode.

The following standalone script opens two streams. One of these streams builds a model, while the second stream plots the distribution of the predicted values.

# Change to the appropriate location for your system
demosDir = "C:/Program Files/IBM/SPSS/Modeler/18.5.0/DEMOS/streams/"

session = modeler.script.session()
tasks = session.getTaskRunner()

# Open the model build stream, locate the C5.0 node and run it
buildstream = tasks.openStreamFromFile(demosDir + "druglearn.str", True)
c50node = buildstream.findByType("c50", None)
results = []
c50node.run(results)

# Now open the plot stream, find the Na_to_K derive and the histogram
plotstream = tasks.openStreamFromFile(demosDir + "drugplot.str", True)
derivenode = plotstream.findByType("derive", None)
histogramnode = plotstream.findByType("histogram", None)

# Create a model applier node, insert it between the derive and histogram nodes
# then run the histgram
applyc50 = plotstream.createModelApplier(results[0], results[0].getName())
applyc50.setPositionBetween(derivenode, histogramnode)
plotstream.linkBetween(applyc50, derivenode, histogramnode)
histogramnode.setPropertyValue("color_field", "$C-Drug")
histogramnode.run([])

# Finally, tidy up the streams
buildstream.close()
plotstream.close()

for stream in modeler.script.streams():
    print stream.getName()