1. Initialize the ComputationGraph model configuration using the init() method:

ComputationGraphConfiguration configuration = compGraphBuilder.build();
   ComputationGraph model = new ComputationGraph(configuration);
 model.init();

2. Set a score listener to monitor the training process:

model.setListeners(new ScoreIterationListener(20), new EvaluativeListener(testIterator, 1, InvocationType.EPOCH_END));

3. Start the training instance by calling the fit() method:

model.fit(trainIterator,numOfEpochs);

4. Call evaluate() to calculate the evaluation metrics:

Evaluation evaluation = model.evaluate(testIterator);
 System.out.println(evaluation.stats());