code: public void evaluate(DataSetIterator iterator, String outputVariable, IEvaluation... evaluations) {
          Preconditions.checkArgument(evaluations != null && evaluations.length > 0, "No evaluations were passed to the evaluate method");
          evaluate(new MultiDataSetIteratorAdapter(iterator), Collections.singletonMap(outputVariable, Arrays.asList(evaluations)),
                  Collections.singletonMap(outputVariable, 0));
      }
docs: Evaluate the performance of a single variable's prediction.<br>
  For example, if the variable to evaluatate was called "softmax" you would use:
  <pre>
  {@code Evaluation e = new Evaluation();
  sameDiff.evaluate(iterator, "softmax", e);}
  </pre>
  
  @param iterator       Iterator as source of data to evaluate
  @param outputVariable The variable to evaluate
  @param evaluations    The evaluations to perform