code: public List<INDArray> feedForward(INDArray input, INDArray featuresMask, INDArray labelsMask) {
          setLayerMaskArrays(featuresMask, labelsMask);
          List<INDArray> list = feedForward(input);
          clearLayerMaskArrays();
          return list;
      }
docs: Compute the activations from the input to the output layer, given mask arrays (that may be null)
  The masking arrays are used in situations such an one-to-many and many-to-one rucerrent neural network (RNN)
  designs, as well as for supporting time series of varying lengths within the same minibatch for RNNs.
  Other than mask arrays, this is equivalent to calling {@link #feedForward(INDArray, boolean)} with train = false