nd4j-backends/nd4j-api-parent/nd4j-api/src/main/java/org/nd4j/linalg/util/ComplexUtil.java
public static IComplexNumber pow(IComplexNumber num, IComplexNumber power) {
        Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).pow(
                        new Complex(power.realComponent().doubleValue(), power.imaginaryComponent().doubleValue()));
        if (c.isNaN())
            c = new Complex(Nd4j.EPS_THRESHOLD, 0.0);
        return Nd4j.createDouble(c.getReal(), c.getImaginary());

    }
public static IComplexNumber pow(IComplexNumber num, IComplexNumber power) {
        Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).pow(
                        new Complex(power.realComponent().doubleValue(), power.imaginaryComponent().doubleValue()));
        if (c.isNaN())
            c = new Complex(Nd4j.EPS_THRESHOLD, 0.0);
        return Nd4j.createDouble(c.getReal(), c.getImaginary());

    }
Raise a complex number to a power

@param num   the number to raise
@param power the power to raise to
@return the number raised to a power