public static void SingleOutputBackward(NdArray <Real> y, IFunction <Real> upward, IFunction <Real> lateral, List <Real[][]> paramLists, List <NdArray <Real> > hPrevParams, List <Real[][]> usedParamLists, List <NdArray <Real> > hUsedPrevParams, List <Real[]> gxPrevGrads, int outputCount, ActionOptional <Real> backward)
{
Real[] gxPrevGrad = new Real[y.BatchCount * outputCount * 4];
Real[] gcPrev = new Real[y.BatchCount * outputCount];
//0:cPrev 1:a 2:i 3:f 4:o 5:c
Real[][] param = paramLists[paramLists.Count - 1];
paramLists.RemoveAt(paramLists.Count - 1);
usedParamLists.Add(param);
int index = 0;
for (int prevOutputIndex = 0; prevOutputIndex < gcPrev.Length; prevOutputIndex++)
{
Real co = Math.Tanh(param[5][prevOutputIndex]);
gcPrev[prevOutputIndex] += y.Grad[prevOutputIndex] * param[4][prevOutputIndex] * GradTanh(co);
gxPrevGrad[index++] = gcPrev[prevOutputIndex] * param[2][prevOutputIndex] * GradTanh(param[1][prevOutputIndex]);
gxPrevGrad[index++] = gcPrev[prevOutputIndex] * param[1][prevOutputIndex] * GradSigmoid(param[2][prevOutputIndex]);
gxPrevGrad[index++] = gcPrev[prevOutputIndex] * param[0][prevOutputIndex] * GradSigmoid(param[3][prevOutputIndex]);
gxPrevGrad[index++] = y.Grad[prevOutputIndex] * co *GradSigmoid(param[4][prevOutputIndex]);
gcPrev[prevOutputIndex] *= param[3][prevOutputIndex];
}
gxPrevGrads.Add(gxPrevGrad);
if (hPrevParams.Count > 0)
{
//linearのBackwardはgxPrev.Gradしか使わないのでgxPrev.Dataは空
NdArray <Real> gxPrev = new NdArray <Real>(new[] { outputCount * 4 }, y.BatchCount);
gxPrev.Grad = gxPrevGrad;
lateral.Backward(gxPrev);
NdArray <Real> hPrevParam = hPrevParams[hPrevParams.Count - 1];
hPrevParams.RemoveAt(hPrevParams.Count - 1);
hUsedPrevParams.Add(hPrevParam);
//hのBakckward
backward(hPrevParam);
//使い切ったら戻す
if (hPrevParams.Count == 0)
{
hPrevParams.AddRange(hUsedPrevParams);
hUsedPrevParams.Clear();
}
}
//linearのBackwardはgy.Gradしか使わないのでgy.Dataは空
NdArray <Real> gy = new NdArray <Real>(new[] { outputCount * 4 }, y.BatchCount);
gy.Grad = gxPrevGrads[0];
gxPrevGrads.RemoveAt(0);
upward.Backward(gy);
//使い切ったら戻す
if (paramLists.Count == 0)
{
paramLists.AddRange(usedParamLists);
usedParamLists.Clear();
}
}