question: @ Override public Instance generateExample ( ) throws Exception { Instance result ; Random rand ; double x ; double y ; double [ ] atts ; Instance inst ; result = null ; rand = getRandom ( ) ; if ( m_DatasetFormat == null ) { throw new Exception ( "Dataset format not defined." ) ; } x = rand . nextDouble ( ) ; x = x * ( getMaxRange ( ) - getMinRange ( ) ) + getMinRange ( ) ; atts = new double [ 1 ] ; atts [ 0 ] = x ; inst = new DenseInstance ( 1.0 , atts ) ; m_Filter . input ( inst ) ; m_Filter . batchFinished ( ) ; inst = m_Filter . output ( ) ; y = inst . value ( 1 ) + getAmplitude ( ) * m_NoiseRandom . nextGaussian ( ) * getNoiseRate ( ) * getNoiseVariance ( ) ; atts = new double [ m_DatasetFormat . numAttributes ( ) ] ; atts [ 0 ] = x ; atts [ 1 ] = y ; result = new DenseInstance ( 1.0 , atts ) ; result . setDataset ( m_DatasetFormat ) ; return result ; }
target:  Generates one example of the dataset.