public INDArray sum(INDArray x, boolean keepDims, long... dimensions) {
    NDValidation.validateNumerical("sum", "x", x);
    Preconditions.checkArgument(dimensions.length >= 0, "dimensions has incorrect size/length. Expected: dimensions.length >= 0, got %s", dimensions.length);
    return Nd4j.exec(new org.nd4j.linalg.api.ops.impl.reduce.same.Sum(x, keepDims, dimensions));
  }