public INDArray norm2(INDArray in, INDArray dimensions) {
    NDValidation.validateNumerical("norm2", "in", in);
    NDValidation.validateNumerical("norm2", "dimensions", dimensions);
    return Nd4j.exec(new org.nd4j.linalg.api.ops.impl.reduce.floating.Norm2(in, dimensions, false));
  }