WekaForecaster Graph Access

Question

Is it possible to access the graphs produced by WekaForecaster API as visible in Weka Explorer. I see that the API per se does not have any function access. Thanks!

Answer 1

I figured out the answer.

1. Create a TSEvaluation object
2. Call evaluateForecaster(TSForecaster forecaster, boolean buildModel, java.io.PrintStream... progress)
3. Call graphFutureForecastOnTesting(GraphDriver driver, TSForecaster forecaster, java.util.List targetNames) which returns a JPanel

For example-

// Your instances
Instances train;
// Your WekaForecaster
WekaForecaster forecaster;
...
// Custom hold out set size
int holdOutSetSize = 1;

// Init evaluator
TSEvaluation eval = new TSEvaluation(train, holdOutSetSize);

boolean buildModel = false;

// Evaluate the forecaster
eval.evaluateForecaster(forecaster, buildModel, System.out);

// Get graph in JPanel after evaluation on training with custom hold out set size
JPanel trainGraph = eval.graphFutureForecastOnTraining(GraphDriver.getDefaultDriver(), 
                  forecaster, AbstractForecaster.
                  stringToList(forecaster.getFieldsToForecast()));

Cheers!

References: http://weka.sourceforge.net/doc.packages/timeseriesForecasting/weka/classifiers/timeseries/eval/TSEvaluation.html