public INDArray atan2(INDArray y, INDArray x) {
    NDValidation.validateNumerical("atan2", "y", y);
    NDValidation.validateNumerical("atan2", "x", x);
    return Nd4j.exec(new org.nd4j.linalg.api.ops.impl.transforms.custom.ATan2(y, x))[0];
  }