docs: private INDArray asMatrix(BytePointer bytes, long length) throws IOException {
          PIXA pixa;
          pixa = pixaReadMemMultipageTiff(bytes, length);
          INDArray data;
          INDArray currentD;
          INDArrayIndex[] index = null;
          switch (this.multiPageMode) {
              case MINIBATCH:
                  data = Nd4j.create(pixa.n(), 1, pixa.pix(0).h(), pixa.pix(0).w());
                  break;
              case CHANNELS:
                  data = Nd4j.create(1, pixa.n(), pixa.pix(0).h(), pixa.pix(0).w());
                  break;
              case FIRST:
                  data = Nd4j.create(1, 1, pixa.pix(0).h(), pixa.pix(0).w());
                  PIX pix = pixa.pix(0);
                  currentD = asMatrix(convert(pix));
                  pixDestroy(pix);
                  index = new INDArrayIndex[]{NDArrayIndex.point(0), NDArrayIndex.point(0),NDArrayIndex.all(),NDArrayIndex.all()};
                  data.put(index , currentD.get(NDArrayIndex.all(), NDArrayIndex.all(),NDArrayIndex.all()));
                  return data;
              default: throw new UnsupportedOperationException("Unsupported MultiPageMode: " + multiPageMode);
          }
          for (int i = 0; i < pixa.n(); i++) {
              PIX pix = pixa.pix(i);
              currentD = asMatrix(convert(pix));
              pixDestroy(pix);
              //TODO to change when 16-bit image is supported
              switch (this.multiPageMode) {
                  case MINIBATCH:
                      index = new INDArrayIndex[]{NDArrayIndex.point(i), NDArrayIndex.all(),NDArrayIndex.all(),NDArrayIndex.all()};
                      break;
                  case CHANNELS:
                      index = new INDArrayIndex[]{NDArrayIndex.all(), NDArrayIndex.point(i),NDArrayIndex.all(),NDArrayIndex.all()};
                      break;
                  default: throw new UnsupportedOperationException("Unsupported MultiPageMode: " + multiPageMode);
              }
              data.put(index , currentD.get(NDArrayIndex.all(), NDArrayIndex.all(),NDArrayIndex.all()));
          }
  
          return data;
      }