//the scalar version
virtual public double getGradCRF(List <double> vecGrad, double scalar, model m, dataSeq x, baseHashSet <int> idSet)
{
idSet.Clear();
int nTag = m.NTag;
//compute beliefs
belief bel = new belief(x.Count, nTag);
belief belMasked = new belief(x.Count, nTag);
_inf.getBeliefs(bel, m, x, scalar, false);
_inf.getBeliefs(belMasked, m, x, scalar, true);
double ZGold = belMasked.Z;
double Z = bel.Z;
List <featureTemp> fList;
//Loop over nodes to compute features and update the gradient
for (int i = 0; i < x.Count; i++)
{
fList = _fGene.getFeatureTemp(x, i);
foreach (featureTemp im in fList)
{
for (int s = 0; s < nTag; s++)
{
int f = _fGene.getNodeFeatID(im.id, s);
idSet.Add(f);
vecGrad[f] += bel.belState[i][s] * im.val;
vecGrad[f] -= belMasked.belState[i][s] * im.val;
}
}
}
//Loop over edges to compute features and update the gradient
for (int i = 1; i < x.Count; i++)
{
for (int s = 0; s < nTag; s++)
{
for (int sPre = 0; sPre < nTag; sPre++)
{
int f = _fGene.getEdgeFeatID(sPre, s);
idSet.Add(f);
vecGrad[f] += bel.belEdge[i][sPre, s];
vecGrad[f] -= belMasked.belEdge[i][sPre, s];
}
}
}
return(Z - ZGold);//-log{P(y*|x,w)}
}
//the scalar version
public void getBeliefs(belief bel, model m, dataSeq x, double scalar, bool mask)
{
int nNodes = x.Count;
int nTag = m.NTag;
dMatrix YY = new dMatrix(nTag, nTag);
double[] dAry = new double[nTag];
List <double> Y = new List <double>(dAry);
List <double> alpha_Y = new List <double>(dAry);
List <double> newAlpha_Y = new List <double>(dAry);
List <double> tmp_Y = new List <double>(dAry);
//compute beta values in a backward scan
for (int i = nNodes - 1; i > 0; i--)
{
getLogYY(scalar, m, x, i, ref YY, ref Y, false, mask);
listTool.listSet(ref tmp_Y, bel.belState[i]);
listTool.listAdd(ref tmp_Y, Y);
logMultiply(YY, tmp_Y, bel.belState[i - 1]);
}
//compute alpha values
for (int i = 0; i < nNodes; i++)
{
getLogYY(scalar, m, x, i, ref YY, ref Y, false, mask);
if (i > 0)
{
listTool.listSet(ref tmp_Y, alpha_Y);
YY.transpose();
logMultiply(YY, tmp_Y, newAlpha_Y);
listTool.listAdd(ref newAlpha_Y, Y);
}
else
{
listTool.listSet(ref newAlpha_Y, Y);
}
if (i > 0)
{
listTool.listSet(ref tmp_Y, Y);
listTool.listAdd(ref tmp_Y, bel.belState[i]);
YY.transpose();
bel.belEdge[i].set(YY);
for (int yPre = 0; yPre < nTag; yPre++)
{
for (int y = 0; y < nTag; y++)
{
bel.belEdge[i][yPre, y] += tmp_Y[y] + alpha_Y[yPre];
}
}
}
List <double> tmp = bel.belState[i];
listTool.listAdd(ref tmp, newAlpha_Y);
listTool.listSet(ref alpha_Y, newAlpha_Y);
}
double Z = logSum(alpha_Y);
for (int i = 0; i < nNodes; i++)
{
List <double> tmp = bel.belState[i];
listTool.listAdd(ref tmp, -Z);
listTool.listExp(ref tmp);
}
for (int i = 1; i < nNodes; i++)
{
bel.belEdge[i].add(-Z);
bel.belEdge[i].eltExp();
}
bel.Z = Z;
}
//get beliefs (mariginal probabilities)
public void getBeliefs(belief bel, model m, dataSeq x, List <dMatrix> YYlist, List <List <double> > Ylist)
{
int nNodes = x.Count;
int nTag = m.NTag;
//dMatrix YY = new dMatrix(nTag, nTag);
double[] dAry = new double[nTag];
//List<double> Y = new List<double>(dAry);
List <double> alpha_Y = new List <double>(dAry);
List <double> newAlpha_Y = new List <double>(dAry);//marginal probability from left to current node (including values of the current node)
List <double> tmp_Y = new List <double>(dAry);
//compute beta values in a backward scan
for (int i = nNodes - 1; i > 0; i--)
{
dMatrix YY = YYlist[i];
List <double> Y = Ylist[i];
//compute the Mi matrix
//getLogYY(m, x, i, ref YY, ref Y, false, mask);
listTool.listSet(ref tmp_Y, bel.belState[i]);//this is meaningful from the 2nd round
listTool.listAdd(ref tmp_Y, Y);
logMultiply(YY, tmp_Y, bel.belState[i - 1]);
}
//compute alpha values
for (int i = 0; i < nNodes; i++)
{
dMatrix YY = null;
if (i > 0)
{
YY = new dMatrix(YYlist[i]);//should use the copy to avoid change
}
List <double> Y = Ylist[i];
//compute the Mi matrix
//getLogYY(m, x, i, ref YY, ref Y, false, mask);
if (i > 0)
{
listTool.listSet(ref tmp_Y, alpha_Y);//this is meaningful from the 2nd round
YY.transpose();
logMultiply(YY, tmp_Y, newAlpha_Y);
listTool.listAdd(ref newAlpha_Y, Y);
}
else
{
listTool.listSet(ref newAlpha_Y, Y);
}
//setting marginal probability on edges
if (i > 0)
{
//beta + Y
listTool.listSet(ref tmp_Y, Y);
listTool.listAdd(ref tmp_Y, bel.belState[i]);
//YY
YY.transpose();
bel.belEdge[i].set(YY);
//belief = alpha + YY + beta + Y
for (int yPre = 0; yPre < nTag; yPre++)
{
for (int y = 0; y < nTag; y++)
{
bel.belEdge[i][yPre, y] += tmp_Y[y] + alpha_Y[yPre];
}
}
}
//setting marginal probability on nodes
List <double> tmp = bel.belState[i]; //beta
listTool.listAdd(ref tmp, newAlpha_Y); //belief = alpha + beta
listTool.listSet(ref alpha_Y, newAlpha_Y);
}
double Z = logSum(alpha_Y);
for (int i = 0; i < nNodes; i++)
{
List <double> tmp = bel.belState[i];
listTool.listAdd(ref tmp, -Z);
listTool.listExp(ref tmp);
}
for (int i = 1; i < nNodes; i++)
{
bel.belEdge[i].add(-Z);
bel.belEdge[i].eltExp();
}
bel.Z = Z;//the overall potential function value
}
override public double getGradCRF(List <double> gradList, model m, dataSeq x, baseHashSet <int> idSet)
{
if (idSet != null)
{
idSet.Clear();
}
int nTag = m.NTag;
//compute beliefs
belief bel = new belief(x.Count, nTag);
belief belMasked = new belief(x.Count, nTag);
//store the YY and Y
List <dMatrix> YYlist = new List <dMatrix>(), maskYYlist = new List <dMatrix>();
List <List <double> > Ylist = new List <List <double> >(), maskYlist = new List <List <double> >();
_inf.getYYandY(m, x, YYlist, Ylist, maskYYlist, maskYlist);
_inf.getBeliefs(bel, m, x, YYlist, Ylist);
_inf.getBeliefs(belMasked, m, x, maskYYlist, maskYlist);
double ZGold = belMasked.Z;
double Z = bel.Z;
List <featureTemp> fList;
//Loop over nodes to compute features and update the gradient
for (int i = 0; i < x.Count; i++)
{
fList = _fGene.getFeatureTemp(x, i);
foreach (featureTemp im in fList)
{
for (int s = 0; s < nTag; s++)
{
int f = _fGene.getNodeFeatID(im.id, s);
if (idSet != null)
{
idSet.Add(f);
}
gradList[f] += bel.belState[i][s] * im.val;
gradList[f] -= belMasked.belState[i][s] * im.val;
}
}
}
//Loop over edges to compute features and update the gradient
for (int i = 1; i < x.Count; i++)
{
//non-rich
if (Global.useTraditionalEdge)
{
for (int s = 0; s < nTag; s++)
{
for (int sPre = 0; sPre < nTag; sPre++)
{
int f = _fGene.getEdgeFeatID(sPre, s);
if (idSet != null)
{
idSet.Add(f);
}
gradList[f] += bel.belEdge[i][sPre, s];
gradList[f] -= belMasked.belEdge[i][sPre, s];
}
}
}
//rich
fList = _fGene.getFeatureTemp(x, i);
foreach (featureTemp im in fList)
{
int id = im.id;
if (id < _fGene.getNRichFeatTemp())
{
for (int s = 0; s < nTag; s++)
{
for (int sPre = 0; sPre < nTag; sPre++)
{
int f = _fGene.getEdgeFeatID(id, sPre, s);
if (idSet != null)
{
idSet.Add(f);
}
gradList[f] += bel.belEdge[i][sPre, s] * im.val;
gradList[f] -= belMasked.belEdge[i][sPre, s] * im.val;
}
}
}
}
}
return(Z - ZGold);//-log{P(y*|x,w)}
}
