Pair<Gradient, INDArray> ret = helper.backpropGradient(input, weights, delta, kernel, strides, pad, biasGradView, weightGradView, afn, layerConf().getCudnnAlgoMode(), layerConf().getCudnnBwdFilterAlgo(), layerConf().getCudnnBwdDataAlgo(), convolutionMode); if (ret != null) { return ret;