Op("sigmoidDerivative") {
        javaPackage = "org.nd4j.linalg.api.ops.impl.transforms.gradient"
        Input(NUMERIC, "x") { description = "Input Variable" }
        Input(NUMERIC, "wrt") { description = "Gradient at the output - dL/dOut. Must have same shape as the input" }
        Output(NUMERIC, "output") { description = "Output (gradient at input of sigmoid)" }