static void setLatentStartingValues(omxFitFunction *oo, FitContext *fc) //remove? TODO
{
BA81FitState *state = (BA81FitState*) oo->argStruct;
BA81Expect *estate = (BA81Expect*) oo->expectation->argStruct;
std::vector<int> &latentMap = state->latentMap;
ba81NormalQuad &quad = estate->getQuad();
int maxAbilities = quad.maxAbilities;
omxMatrix *estMean = estate->estLatentMean;
omxMatrix *estCov = estate->estLatentCov;
for (int a1 = 0; a1 < maxAbilities; ++a1) {
if (latentMap[a1] >= 0) {
int to = latentMap[a1];
fc->est[to] = omxVectorElement(estMean, a1);
}
for (int a2 = 0; a2 <= a1; ++a2) {
int to = latentMap[maxAbilities + triangleLoc1(a1) + a2];
if (to < 0) continue;
fc->est[to] = omxMatrixElement(estCov, a1, a2);
}
}
if (estate->verbose >= 1) {
mxLog("%s: set latent parameters for version %d",
oo->name(), estate->ElatentVersion);
}
}
void ba81AggregateDistributions(std::vector<struct omxExpectation *> &expectation,
int *version, omxMatrix *meanMat, omxMatrix *covMat)
{
int allVer = 0;
for (size_t ex=0; ex < expectation.size(); ++ex) {
BA81Expect *ba81 = (BA81Expect *) expectation[ex]->argStruct;
allVer += ba81->ElatentVersion;
}
if (*version == allVer) return;
*version = allVer;
BA81Expect *exemplar = (BA81Expect *) expectation[0]->argStruct;
ba81NormalQuad &quad = exemplar->getQuad();
ba81NormalQuad combined(quad);
int got = 0;
for (size_t ex=0; ex < expectation.size(); ++ex) {
BA81Expect *ba81 = (BA81Expect *) expectation[ex]->argStruct;
// double weight = 1/ba81->weightSum; ?
combined.addSummary(ba81->grp.quad);
++got;
}
if (got == 0) return;
int dim = quad.abilities();
int numLatents = dim + triangleLoc1(dim);
Eigen::ArrayXd latentDist(numLatents);
combined.EAP(got, latentDist);
for (int d1=quad.abilities(); d1 < numLatents; d1++) {
latentDist[d1] *= got / (got - 1.0);
}
exportLatentDistToOMX(quad, latentDist.data(), meanMat, covMat);
}
/**
* MAP is not affected by the number of items. EAP is. Likelihood can
* get concentrated in a single quadrature ordinate. For 3PL, response
* patterns can have a bimodal likelihood. This will confuse MAP and
* is a key advantage of EAP (Thissen & Orlando, 2001, p. 136).
*
* Thissen, D. & Orlando, M. (2001). IRT for items scored in two
* categories. In D. Thissen & H. Wainer (Eds.), \emph{Test scoring}
* (pp 73-140). Lawrence Erlbaum Associates, Inc.
*/
static void
ba81PopulateAttributes(omxExpectation *oo, SEXP robj)
{
BA81Expect *state = (BA81Expect *) oo->argStruct;
if (!state->debugInternal) return;
ba81NormalQuad &quad = state->getQuad();
int maxAbilities = quad.abilities();
const int numUnique = state->getNumUnique();
const double LogLargest = state->LogLargestDouble;
SEXP Rlik;
if (state->grp.patternLik.size() != numUnique) {
refreshPatternLikelihood(state, oo->dynamicDataSource);
}
Rf_protect(Rlik = Rf_allocVector(REALSXP, numUnique));
memcpy(REAL(Rlik), state->grp.patternLik.data(), sizeof(double) * numUnique);
double *lik_out = REAL(Rlik);
for (int px=0; px < numUnique; ++px) {
// Must return value in log units because it may not be representable otherwise
lik_out[px] = log(lik_out[px]) - LogLargest;
}
MxRList dbg;
dbg.add("patternLikelihood", Rlik);
if (quad.getEstepTableSize(0)) {
SEXP Rexpected;
Rf_protect(Rexpected = Rf_allocVector(REALSXP, quad.getEstepTableSize(0)));
Eigen::Map< Eigen::ArrayXd > box(REAL(Rexpected), quad.getEstepTableSize(0));
quad.exportEstepTable(0, box);
dbg.add("em.expected", Rexpected);
}
SEXP Rmean, Rcov;
if (state->estLatentMean) {
Rf_protect(Rmean = Rf_allocVector(REALSXP, maxAbilities));
memcpy(REAL(Rmean), state->estLatentMean->data, maxAbilities * sizeof(double));
dbg.add("mean", Rmean);
}
if (state->estLatentCov) {
Rf_protect(Rcov = Rf_allocMatrix(REALSXP, maxAbilities, maxAbilities));
memcpy(REAL(Rcov), state->estLatentCov->data, maxAbilities * maxAbilities * sizeof(double));
dbg.add("cov", Rcov);
}
Rf_setAttrib(robj, Rf_install("debug"), dbg.asR());
}
// Attempt G-H grid? http://dbarajassolano.wordpress.com/2012/01/26/on-sparse-grid-quadratures/
void ba81RefreshQuadrature(omxExpectation* oo)
{
BA81Expect *state = (BA81Expect *) oo->argStruct;
ba81NormalQuad &quad = state->getQuad();
Eigen::VectorXd mean;
Eigen::MatrixXd fullCov;
state->getLatentDistribution(NULL, mean, fullCov);
if (state->verbose >= 1) {
mxLog("%s: refresh quadrature", oo->name);
if (state->verbose >= 2) {
int dim = mean.rows();
pda(mean.data(), 1, dim);
pda(fullCov.data(), dim, dim);
}
}
quad.refresh(mean, fullCov);
}
void omxInitFitFunctionBA81(omxFitFunction* oo)
{
if (!oo->argStruct) { // ugh!
BA81FitState *state = new BA81FitState;
oo->argStruct = state;
}
omxState *currentState = oo->matrix->currentState;
BA81FitState *state = (BA81FitState*) oo->argStruct;
omxExpectation *expectation = oo->expectation;
BA81Expect *estate = (BA81Expect*) expectation->argStruct;
estate->fit = oo;
oo->computeFun = ba81Compute;
oo->setVarGroup = ba81SetFreeVarGroup;
oo->destructFun = ba81Destroy;
oo->gradientAvailable = TRUE;
oo->hessianAvailable = TRUE;
int maxParam = estate->itemParam->rows;
state->itemDerivPadSize = maxParam + triangleLoc1(maxParam);
int numItems = estate->itemParam->cols;
for (int ix=0; ix < numItems; ix++) {
const double *spec = estate->itemSpec(ix);
int id = spec[RPF_ISpecID];
if (id < 0 || id >= Glibrpf_numModels) {
Rf_error("ItemSpec %d has unknown item model %d", ix, id);
}
}
state->itemParam = omxInitMatrix(0, 0, TRUE, currentState);
state->latentMean = omxInitMatrix(0, 0, TRUE, currentState);
state->latentCov = omxInitMatrix(0, 0, TRUE, currentState);
state->copyEstimates(estate);
state->returnRowLikelihoods = Rf_asInteger(R_do_slot(oo->rObj, Rf_install("vector")));
}
static void gradCov(omxFitFunction *oo, FitContext *fc)
{
const double Scale = Global->llScale;
omxExpectation *expectation = oo->expectation;
BA81FitState *state = (BA81FitState*) oo->argStruct;
BA81Expect *estate = (BA81Expect*) expectation->argStruct;
if (estate->verbose >= 1) mxLog("%s: cross product approximation", oo->name());
estate->grp.ba81OutcomeProb(estate->itemParam->data, FALSE);
const int numThreads = Global->numThreads;
const int numUnique = estate->getNumUnique();
ba81NormalQuad &quad = estate->getQuad();
const int numSpecific = quad.numSpecific;
const int maxDims = quad.maxDims;
const int pDims = numSpecific? maxDims-1 : maxDims;
const int maxAbilities = quad.maxAbilities;
Eigen::MatrixXd icovMat(pDims, pDims);
if (maxAbilities) {
Eigen::VectorXd mean;
Eigen::MatrixXd srcMat;
estate->getLatentDistribution(fc, mean, srcMat);
icovMat = srcMat.topLeftCorner(pDims, pDims);
Matrix tmp(icovMat.data(), pDims, pDims);
int info = InvertSymmetricPosDef(tmp, 'U');
if (info) {
omxRaiseErrorf("%s: latent covariance matrix is not positive definite", oo->name());
return;
}
icovMat.triangularView<Eigen::Lower>() = icovMat.transpose().triangularView<Eigen::Lower>();
}
std::vector<int> &rowMap = estate->grp.rowMap;
double *rowWeight = estate->grp.rowWeight;
std::vector<bool> &rowSkip = estate->grp.rowSkip;
const int totalQuadPoints = quad.totalQuadPoints;
omxMatrix *itemParam = estate->itemParam;
omxBuffer<double> patternLik(numUnique);
const int priDerivCoef = pDims + triangleLoc1(pDims);
const int numLatents = maxAbilities + triangleLoc1(maxAbilities);
const int thrDerivSize = itemParam->cols * state->itemDerivPadSize;
const int totalOutcomes = estate->totalOutcomes();
const int numItems = state->freeItemParams? estate->numItems() : 0;
const size_t numParam = fc->varGroup->vars.size();
std::vector<double> thrGrad(numThreads * numParam);
std::vector<double> thrMeat(numThreads * numParam * numParam);
const double *wherePrep = quad.wherePrep.data();
if (numSpecific == 0) {
omxBuffer<double> thrLxk(totalQuadPoints * numThreads);
omxBuffer<double> derivCoef(totalQuadPoints * priDerivCoef);
if (state->freeLatents) {
#pragma omp parallel for num_threads(numThreads)
for (int qx=0; qx < totalQuadPoints; qx++) {
const double *where = wherePrep + qx * maxDims;
calcDerivCoef(fc, state, estate, icovMat.data(), where,
derivCoef.data() + qx * priDerivCoef);
}
}
#pragma omp parallel for num_threads(numThreads)
for (int px=0; px < numUnique; px++) {
if (rowSkip[px]) continue;
int thrId = omx_absolute_thread_num();
double *lxk = thrLxk.data() + thrId * totalQuadPoints;
omxBuffer<double> expected(totalOutcomes); // can use maxOutcomes instead TODO
std::vector<double> deriv0(thrDerivSize);
std::vector<double> latentGrad(numLatents);
std::vector<double> patGrad(numParam);
double *grad = thrGrad.data() + thrId * numParam;
double *meat = thrMeat.data() + thrId * numParam * numParam;
estate->grp.ba81LikelihoodSlow2(px, lxk);
// If patternLik is already valid, maybe could avoid this loop TODO
double patternLik1 = 0;
for (int qx=0; qx < totalQuadPoints; qx++) {
patternLik1 += lxk[qx];
}
patternLik[px] = patternLik1;
// if (!validPatternLik(state, patternLik1)) complain, TODO
for (int qx=0; qx < totalQuadPoints; qx++) {
double tmp = lxk[qx];
mapLatentDeriv(state, estate, tmp, derivCoef.data() + qx * priDerivCoef,
latentGrad.data());
for (int ix=0; ix < numItems; ++ix) {
int pick = estate->grp.dataColumns[ix][rowMap[px]];
if (pick == NA_INTEGER) continue;
OMXZERO(expected.data(), estate->itemOutcomes(ix));
expected[pick-1] = tmp;
const double *spec = estate->itemSpec(ix);
double *iparam = omxMatrixColumn(itemParam, ix);
const int id = spec[RPF_ISpecID];
double *myDeriv = deriv0.data() + ix * state->itemDerivPadSize;
(*Glibrpf_model[id].dLL1)(spec, iparam, wherePrep + qx * maxDims,
expected.data(), myDeriv);
}
}
gradCov_finish_1pat(1 / patternLik1, rowWeight[px], numItems, numLatents, numParam,
state, estate, itemParam, deriv0, latentGrad, Scale, patGrad, grad, meat);
}
} else {
const int totalPrimaryPoints = quad.totalPrimaryPoints;
const int specificPoints = quad.quadGridSize;
omxBuffer<double> thrLxk(totalQuadPoints * numSpecific * numThreads);
omxBuffer<double> thrEi(totalPrimaryPoints * numThreads);
omxBuffer<double> thrEis(totalPrimaryPoints * numSpecific * numThreads);
const int derivPerPoint = priDerivCoef + 2 * numSpecific;
omxBuffer<double> derivCoef(totalQuadPoints * derivPerPoint);
if (state->freeLatents) {
#pragma omp parallel for num_threads(numThreads)
for (int qx=0; qx < totalQuadPoints; qx++) {
const double *where = wherePrep + qx * maxDims;
calcDerivCoef(fc, state, estate, icovMat.data(), where,
derivCoef.data() + qx * derivPerPoint);
for (int Sgroup=0; Sgroup < numSpecific; ++Sgroup) {
calcDerivCoef1(fc, state, estate, where, Sgroup,
derivCoef.data() + qx * derivPerPoint + priDerivCoef + 2 * Sgroup);
}
}
}
#pragma omp parallel for num_threads(numThreads)
for (int px=0; px < numUnique; px++) {
if (rowSkip[px]) continue;
int thrId = omx_absolute_thread_num();
double *lxk = thrLxk.data() + totalQuadPoints * numSpecific * thrId;
double *Ei = thrEi.data() + totalPrimaryPoints * thrId;
double *Eis = thrEis.data() + totalPrimaryPoints * numSpecific * thrId;
omxBuffer<double> expected(totalOutcomes); // can use maxOutcomes instead TODO
std::vector<double> deriv0(thrDerivSize);
std::vector<double> latentGrad(numLatents);
std::vector<double> patGrad(numParam);
double *grad = thrGrad.data() + thrId * numParam;
double *meat = thrMeat.data() + thrId * numParam * numParam;
estate->grp.cai2010EiEis(px, lxk, Eis, Ei);
for (int qx=0, qloc = 0; qx < totalPrimaryPoints; qx++) {
for (int sgroup=0; sgroup < numSpecific; ++sgroup) {
Eis[qloc] = Ei[qx] / Eis[qloc];
++qloc;
}
}
for (int qloc=0, eisloc=0, qx=0; eisloc < totalPrimaryPoints * numSpecific; eisloc += numSpecific) {
for (int sx=0; sx < specificPoints; sx++) {
mapLatentDeriv(state, estate, Eis[eisloc] * lxk[qloc],
derivCoef.data() + qx * derivPerPoint,
latentGrad.data());
for (int Sgroup=0; Sgroup < numSpecific; Sgroup++) {
double lxk1 = lxk[qloc];
double Eis1 = Eis[eisloc + Sgroup];
double tmp = Eis1 * lxk1;
mapLatentDerivS(state, estate, Sgroup, tmp,
derivCoef.data() + qx * derivPerPoint + priDerivCoef + 2 * Sgroup,
latentGrad.data());
for (int ix=0; ix < numItems; ++ix) {
if (estate->grp.Sgroup[ix] != Sgroup) continue;
int pick = estate->grp.dataColumns[ix][rowMap[px]];
if (pick == NA_INTEGER) continue;
OMXZERO(expected.data(), estate->itemOutcomes(ix));
expected[pick-1] = tmp;
const double *spec = estate->itemSpec(ix);
double *iparam = omxMatrixColumn(itemParam, ix);
const int id = spec[RPF_ISpecID];
const int dims = spec[RPF_ISpecDims];
double *myDeriv = deriv0.data() + ix * state->itemDerivPadSize;
const double *where = wherePrep + qx * maxDims;
Eigen::VectorXd ptheta(dims);
for (int dx=0; dx < dims; dx++) {
ptheta[dx] = where[std::min(dx, maxDims-1)];
}
(*Glibrpf_model[id].dLL1)(spec, iparam, ptheta.data(),
expected.data(), myDeriv);
}
++qloc;
}
++qx;
}
}
// If patternLik is already valid, maybe could avoid this loop TODO
double patternLik1 = 0;
for (int qx=0; qx < totalPrimaryPoints; ++qx) {
patternLik1 += Ei[qx];
}
patternLik[px] = patternLik1;
gradCov_finish_1pat(1 / patternLik1, rowWeight[px], numItems, numLatents, numParam,
state, estate, itemParam, deriv0, latentGrad, Scale, patGrad, grad, meat);
}
}
for (int tx=1; tx < numThreads; ++tx) {
double *th = thrGrad.data() + tx * numParam;
for (size_t en=0; en < numParam; ++en) {
thrGrad[en] += th[en];
}
}
for (int tx=1; tx < numThreads; ++tx) {
double *th = thrMeat.data() + tx * numParam * numParam;
for (size_t en=0; en < numParam * numParam; ++en) {
thrMeat[en] += th[en];
}
}
for (size_t d1=0; d1 < numParam; ++d1) {
fc->grad(d1) += thrGrad[d1];
}
if (fc->infoB) {
for (size_t d1=0; d1 < numParam; ++d1) {
for (size_t d2=0; d2 < numParam; ++d2) {
int cell = d1 * numParam + d2;
fc->infoB[cell] += thrMeat[cell];
}
}
}
}
static void sandwich(omxFitFunction *oo, FitContext *fc)
{
const double abScale = fabs(Global->llScale);
omxExpectation *expectation = oo->expectation;
BA81FitState *state = (BA81FitState*) oo->argStruct;
BA81Expect *estate = (BA81Expect*) expectation->argStruct;
if (estate->verbose >= 1) mxLog("%s: sandwich", oo->name());
estate->grp.ba81OutcomeProb(estate->itemParam->data, FALSE);
const int numThreads = Global->numThreads;
const int numUnique = estate->getNumUnique();
ba81NormalQuad &quad = estate->getQuad();
const int numSpecific = quad.numSpecific;
const int maxDims = quad.maxDims;
std::vector<int> &rowMap = estate->grp.rowMap;
double *rowWeight = estate->grp.rowWeight;
std::vector<bool> &rowSkip = estate->grp.rowSkip;
const int totalQuadPoints = quad.totalQuadPoints;
omxMatrix *itemParam = estate->itemParam;
omxBuffer<double> patternLik(numUnique);
std::vector<const double*> &itemSpec = estate->grp.spec;
const int totalOutcomes = estate->totalOutcomes();
const int numItems = estate->grp.numItems();
const size_t numParam = fc->varGroup->vars.size();
const double *wherePrep = quad.wherePrep.data();
std::vector<double> thrBreadG(numThreads * numParam * numParam);
std::vector<double> thrBreadH(numThreads * numParam * numParam);
std::vector<double> thrMeat(numThreads * numParam * numParam);
if (numSpecific == 0) {
omxBuffer<double> thrLxk(totalQuadPoints * numThreads);
#pragma omp parallel for num_threads(numThreads)
for (int px=0; px < numUnique; px++) {
if (rowSkip[px]) continue;
int thrId = omx_absolute_thread_num();
double *lxk = thrLxk.data() + thrId * totalQuadPoints;
omxBuffer<double> itemDeriv(state->itemDerivPadSize);
omxBuffer<double> expected(totalOutcomes); // can use maxOutcomes instead TODO
double *breadG = thrBreadG.data() + thrId * numParam * numParam; //a
double *breadH = thrBreadH.data() + thrId * numParam * numParam; //a
double *meat = thrMeat.data() + thrId * numParam * numParam; //b
std::vector<double> patGrad(numParam);
estate->grp.ba81LikelihoodSlow2(px, lxk);
// If patternLik is already valid, maybe could avoid this loop TODO
double patternLik1 = 0;
for (int qx=0; qx < totalQuadPoints; qx++) {
patternLik1 += lxk[qx];
}
patternLik[px] = patternLik1;
// if (!validPatternLik(state, patternLik1)) complain
double weight = 1 / patternLik[px];
for (int qx=0; qx < totalQuadPoints; qx++) {
double tmp = lxk[qx] * weight;
double sqrtTmp = sqrt(tmp);
std::vector<double> gradBuf(numParam);
int gradOffset = 0;
for (int ix=0; ix < numItems; ++ix) {
if (ix) gradOffset += state->paramPerItem[ix-1];
int pick = estate->grp.dataColumns[ix][rowMap[px]];
if (pick == NA_INTEGER) continue;
pick -= 1;
const int iOutcomes = estate->itemOutcomes(ix);
OMXZERO(expected.data(), iOutcomes);
expected[pick] = 1;
const double *spec = itemSpec[ix];
double *iparam = omxMatrixColumn(itemParam, ix);
const int id = spec[RPF_ISpecID];
OMXZERO(itemDeriv.data(), state->itemDerivPadSize);
(*Glibrpf_model[id].dLL1)(spec, iparam, wherePrep + qx * maxDims,
expected.data(), itemDeriv.data());
(*Glibrpf_model[id].dLL2)(spec, iparam, itemDeriv.data());
for (int par = 0; par < state->paramPerItem[ix]; ++par) {
int to = state->itemGradMap[gradOffset + par];
if (to >= 0) {
gradBuf[to] -= itemDeriv[par] * sqrtTmp;
patGrad[to] -= itemDeriv[par] * tmp;
}
}
int derivBase = ix * state->itemDerivPadSize;
for (int ox=0; ox < state->itemDerivPadSize; ox++) {
int to = state->paramMap[derivBase + ox];
if (to >= int(numParam)) {
int Hto = to - numParam;
breadH[Hto] += abScale * itemDeriv[ox] * tmp * rowWeight[px];
}
}
}
addSymOuterProd(abScale * rowWeight[px], gradBuf.data(), numParam, breadG);
}
addSymOuterProd(abScale * rowWeight[px], patGrad.data(), numParam, meat);
}
} else {
Rf_error("Sandwich information matrix method is not implemented for bifactor models");
const int totalPrimaryPoints = quad.totalPrimaryPoints;
const int specificPoints = quad.quadGridSize;
omxBuffer<double> thrLxk(totalQuadPoints * numSpecific * numThreads);
omxBuffer<double> thrEi(totalPrimaryPoints * numThreads);
omxBuffer<double> thrEis(totalPrimaryPoints * numSpecific * numThreads);
#pragma omp parallel for num_threads(numThreads)
for (int px=0; px < numUnique; px++) {
if (rowSkip[px]) continue;
int thrId = omx_absolute_thread_num();
omxBuffer<double> expected(totalOutcomes); // can use maxOutcomes instead TODO
omxBuffer<double> itemDeriv(state->itemDerivPadSize);
double *breadG = thrBreadG.data() + thrId * numParam * numParam; //a
double *breadH = thrBreadH.data() + thrId * numParam * numParam; //a
double *meat = thrMeat.data() + thrId * numParam * numParam; //b
std::vector<double> patGrad(numParam);
double *lxk = thrLxk.data() + totalQuadPoints * numSpecific * thrId;
double *Ei = thrEi.data() + totalPrimaryPoints * thrId;
double *Eis = thrEis.data() + totalPrimaryPoints * numSpecific * thrId;
estate->grp.cai2010EiEis(px, lxk, Eis, Ei);
// If patternLik is already valid, maybe could avoid this loop TODO
double patternLik1 = 0;
for (int qx=0; qx < totalPrimaryPoints; ++qx) {
patternLik1 += Ei[qx];
}
patternLik[px] = patternLik1;
for (int qx=0, qloc = 0; qx < totalPrimaryPoints; qx++) {
for (int sgroup=0; sgroup < numSpecific; ++sgroup) {
Eis[qloc] = Ei[qx] / Eis[qloc];
++qloc;
}
}
// WARNING: I didn't work out the math. I just coded this the way
// it seems to make sense.
for (int qloc=0, eisloc=0, qx=0; eisloc < totalPrimaryPoints * numSpecific; eisloc += numSpecific) {
for (int sx=0; sx < specificPoints; sx++) {
for (int Sgroup=0; Sgroup < numSpecific; Sgroup++) {
std::vector<double> gradBuf(numParam);
int gradOffset = 0;
double lxk1 = lxk[qloc + Sgroup];
double Eis1 = Eis[eisloc + Sgroup];
double tmp = Eis1 * lxk1 / patternLik1;
double sqrtTmp = sqrt(tmp);
for (int ix=0; ix < numItems; ++ix) {
if (ix) gradOffset += state->paramPerItem[ix-1];
if (estate->grp.Sgroup[ix] != Sgroup) continue;
int pick = estate->grp.dataColumns[ix][rowMap[px]];
if (pick == NA_INTEGER) continue;
OMXZERO(expected.data(), estate->itemOutcomes(ix));
expected[pick-1] = 1;
const double *spec = itemSpec[ix];
double *iparam = omxMatrixColumn(itemParam, ix);
const int id = spec[RPF_ISpecID];
const int dims = spec[RPF_ISpecDims];
OMXZERO(itemDeriv.data(), state->itemDerivPadSize);
const double *where = wherePrep + qx * maxDims;
Eigen::VectorXd ptheta(dims);
for (int dx=0; dx < dims; dx++) {
ptheta[dx] = where[std::min(dx, maxDims-1)];
}
(*Glibrpf_model[id].dLL1)(spec, iparam, ptheta.data(),
expected.data(), itemDeriv.data());
(*Glibrpf_model[id].dLL2)(spec, iparam, itemDeriv.data());
for (int par = 0; par < state->paramPerItem[ix]; ++par) {
int to = state->itemGradMap[gradOffset + par];
if (to >= 0) {
gradBuf[to] -= itemDeriv[par] * sqrtTmp;
patGrad[to] -= itemDeriv[par] * tmp;
}
}
int derivBase = ix * state->itemDerivPadSize;
for (int ox=0; ox < state->itemDerivPadSize; ox++) {
int to = state->paramMap[derivBase + ox];
if (to >= int(numParam)) {
int Hto = to - numParam;
breadH[Hto] += (abScale * itemDeriv[ox] *
tmp * rowWeight[px]);
}
}
}
addSymOuterProd(abScale * rowWeight[px], gradBuf.data(), numParam, breadG);
}
qloc += numSpecific;
++qx;
}
}
addSymOuterProd(abScale * rowWeight[px], patGrad.data(), numParam, meat);
}
}
// only need upper triangle TODO
for (int tx=1; tx < numThreads; ++tx) {
double *th = thrBreadG.data() + tx * numParam * numParam;
for (size_t en=0; en < numParam * numParam; ++en) {
thrBreadG[en] += th[en];
}
}
for (int tx=1; tx < numThreads; ++tx) {
double *th = thrBreadH.data() + tx * numParam * numParam;
for (size_t en=0; en < numParam * numParam; ++en) {
thrBreadH[en] += th[en];
}
}
for (int tx=1; tx < numThreads; ++tx) {
double *th = thrMeat.data() + tx * numParam * numParam;
for (size_t en=0; en < numParam * numParam; ++en) {
thrMeat[en] += th[en];
}
}
//pda(thrBreadG.data(), numParam, numParam);
//pda(thrBreadH.data(), numParam, numParam);
//pda(thrMeat.data(), numParam, numParam);
if (fc->infoA) {
for (size_t d1=0; d1 < numParam; ++d1) {
for (size_t d2=0; d2 < numParam; ++d2) {
int cell = d1 * numParam + d2;
fc->infoA[cell] += thrBreadH[cell] - thrBreadG[cell] + thrMeat[cell];
}
}
}
if (fc->infoB) {
for (size_t d1=0; d1 < numParam; ++d1) {
for (size_t d2=0; d2 < numParam; ++d2) {
int cell = d1 * numParam + d2;
fc->infoB[cell] += thrMeat[cell];
}
}
}
}
static double
ba81ComputeEMFit(omxFitFunction* oo, int want, FitContext *fc)
{
const double Scale = Global->llScale;
BA81FitState *state = (BA81FitState*) oo->argStruct;
BA81Expect *estate = (BA81Expect*) oo->expectation->argStruct;
omxMatrix *itemParam = estate->itemParam;
std::vector<const double*> &itemSpec = estate->grp.spec;
std::vector<int> &cumItemOutcomes = estate->grp.cumItemOutcomes;
ba81NormalQuad &quad = estate->getQuad();
const int maxDims = quad.maxDims;
const size_t numItems = itemSpec.size();
const int do_fit = want & FF_COMPUTE_FIT;
const int do_deriv = want & (FF_COMPUTE_GRADIENT | FF_COMPUTE_HESSIAN | FF_COMPUTE_IHESSIAN);
if (do_deriv && !state->freeItemParams) {
omxRaiseErrorf("%s: no free parameters", oo->name());
return NA_REAL;
}
if (state->returnRowLikelihoods) {
omxRaiseErrorf("%s: vector=TRUE not implemented", oo->name());
return NA_REAL;
}
if (estate->verbose >= 3) mxLog("%s: complete data fit(want fit=%d deriv=%d)", oo->name(), do_fit, do_deriv);
if (do_fit) estate->grp.ba81OutcomeProb(itemParam->data, TRUE);
const int thrDerivSize = itemParam->cols * state->itemDerivPadSize;
std::vector<double> thrDeriv(thrDerivSize * Global->numThreads);
double *wherePrep = quad.wherePrep.data();
double ll = 0;
#pragma omp parallel for num_threads(Global->numThreads) reduction(+:ll)
for (size_t ix=0; ix < numItems; ix++) {
const int thrId = omx_absolute_thread_num();
const double *spec = itemSpec[ix];
const int id = spec[RPF_ISpecID];
const int dims = spec[RPF_ISpecDims];
Eigen::VectorXd ptheta(dims);
const rpf_dLL1_t dLL1 = Glibrpf_model[id].dLL1;
const int iOutcomes = estate->grp.itemOutcomes[ix];
const int outcomeBase = cumItemOutcomes[ix] * quad.totalQuadPoints;
const double *weight = estate->expected + outcomeBase;
const double *oProb = estate->grp.outcomeProb + outcomeBase;
const double *iparam = omxMatrixColumn(itemParam, ix);
double *myDeriv = thrDeriv.data() + thrDerivSize * thrId + ix * state->itemDerivPadSize;
for (int qx=0; qx < quad.totalQuadPoints; qx++) {
if (do_fit) {
for (int ox=0; ox < iOutcomes; ox++) {
ll += weight[ox] * oProb[ox];
}
}
if (do_deriv) {
double *where = wherePrep + qx * maxDims;
for (int dx=0; dx < dims; dx++) {
ptheta[dx] = where[std::min(dx, maxDims-1)];
}
(*dLL1)(spec, iparam, ptheta.data(), weight, myDeriv);
}
weight += iOutcomes;
oProb += iOutcomes;
}
}
size_t excluded = 0;
if (do_deriv) {
double *deriv0 = thrDeriv.data();
int perThread = itemParam->cols * state->itemDerivPadSize;
for (int th=1; th < Global->numThreads; th++) {
double *thrD = thrDeriv.data() + th * perThread;
for (int ox=0; ox < perThread; ox++) deriv0[ox] += thrD[ox];
}
int numFreeParams = int(state->numFreeParam);
int ox=-1;
for (size_t ix=0; ix < numItems; ix++) {
const double *spec = itemSpec[ix];
int id = spec[RPF_ISpecID];
double *iparam = omxMatrixColumn(itemParam, ix);
double *pad = deriv0 + ix * state->itemDerivPadSize;
(*Glibrpf_model[id].dLL2)(spec, iparam, pad);
HessianBlock *hb = state->hBlocks[ix].clone();
hb->mat.triangularView<Eigen::Upper>().setZero();
for (int dx=0; dx < state->itemDerivPadSize; ++dx) {
int to = state->paramMap[++ox];
if (to == -1) continue;
// Need to check because this can happen if
// lbounds/ubounds are not set appropriately.
if (0 && !std::isfinite(deriv0[ox])) {
int item = ox / itemParam->rows;
mxLog("item parameters:\n");
const double *spec = itemSpec[item];
int id = spec[RPF_ISpecID];
int numParam = (*Glibrpf_model[id].numParam)(spec);
double *iparam = omxMatrixColumn(itemParam, item);
pda(iparam, numParam, 1);
// Perhaps bounds can be pulled in from librpf? TODO
Rf_error("Deriv %d for item %d is %f; are you missing a lbound/ubound?",
ox, item, deriv0[ox]);
}
if (to < numFreeParams) {
if (want & FF_COMPUTE_GRADIENT) {
fc->grad(to) -= Scale * deriv0[ox];
}
} else {
if (want & (FF_COMPUTE_HESSIAN | FF_COMPUTE_IHESSIAN)) {
int Hto = state->hbMap[ox];
if (Hto >= 0) hb->mat.data()[Hto] -= Scale * deriv0[ox];
}
}
}
fc->queue(hb);
}
}
if (excluded && estate->verbose >= 1) {
mxLog("%s: Hessian not positive definite for %d/%d items",
oo->name(), (int) excluded, (int) numItems);
}
if (excluded == numItems) {
omxRaiseErrorf("Hessian not positive definite for %d/%d items",
(int) excluded, (int) numItems);
}
return Scale * ll;
}
static void
ba81ComputeFit(omxFitFunction* oo, int want, FitContext *fc)
{
BA81FitState *state = (BA81FitState*) oo->argStruct;
BA81Expect *estate = (BA81Expect*) oo->expectation->argStruct;
if (fc) state->numFreeParam = fc->varGroup->vars.size();
if (want & FF_COMPUTE_INITIAL_FIT) return;
if (estate->type == EXPECTATION_AUGMENTED) {
buildItemParamMap(oo, fc);
if (want & FF_COMPUTE_PARAMFLAVOR) {
for (size_t px=0; px < state->numFreeParam; ++px) {
if (state->paramFlavor[px] == NULL) continue;
fc->flavor[px] = state->paramFlavor[px];
}
return;
}
if (want & FF_COMPUTE_PREOPTIMIZE) {
omxExpectationCompute(fc, oo->expectation, NULL);
return;
}
if (want & FF_COMPUTE_INFO) {
buildLatentParamMap(oo, fc);
if (!state->freeItemParams) {
omxRaiseErrorf("%s: no free parameters", oo->name());
return;
}
ba81SetupQuadrature(oo->expectation);
if (fc->infoMethod == INFO_METHOD_HESSIAN) {
ba81ComputeEMFit(oo, FF_COMPUTE_HESSIAN, fc);
} else {
omxRaiseErrorf("Information matrix approximation method %d is not available",
fc->infoMethod);
return;
}
return;
}
double got = ba81ComputeEMFit(oo, want, fc);
oo->matrix->data[0] = got;
return;
} else if (estate->type == EXPECTATION_OBSERVED) {
if (want == FF_COMPUTE_STARTING) {
buildLatentParamMap(oo, fc);
if (state->freeLatents) setLatentStartingValues(oo, fc);
return;
}
if (want & (FF_COMPUTE_INFO | FF_COMPUTE_GRADIENT)) {
buildLatentParamMap(oo, fc); // only to check state->freeLatents
buildItemParamMap(oo, fc);
if (!state->freeItemParams && !state->freeLatents) {
omxRaiseErrorf("%s: no free parameters", oo->name());
return;
}
ba81SetupQuadrature(oo->expectation);
if (want & FF_COMPUTE_GRADIENT ||
(want & FF_COMPUTE_INFO && fc->infoMethod == INFO_METHOD_MEAT)) {
gradCov(oo, fc);
} else {
if (state->freeLatents) {
omxRaiseErrorf("Information matrix approximation method %d is not available",
fc->infoMethod);
return;
}
if (!state->freeItemParams) {
omxRaiseErrorf("%s: no free parameters", oo->name());
return;
}
sandwich(oo, fc);
}
}
if (want & (FF_COMPUTE_HESSIAN | FF_COMPUTE_IHESSIAN)) {
omxRaiseErrorf("%s: Hessian is not available for observed data", oo->name());
}
if (want & FF_COMPUTE_MAXABSCHANGE) {
double mac = std::max(omxMaxAbsDiff(state->itemParam, estate->itemParam),
omxMaxAbsDiff(state->latentMean, estate->_latentMeanOut));
fc->mac = std::max(mac, omxMaxAbsDiff(state->latentCov, estate->_latentCovOut));
state->copyEstimates(estate);
}
if (want & FF_COMPUTE_FIT) {
omxExpectationCompute(fc, oo->expectation, NULL);
Eigen::ArrayXd &patternLik = estate->grp.patternLik;
const int numUnique = estate->getNumUnique();
if (state->returnRowLikelihoods) {
const double OneOverLargest = estate->grp.quad.getReciprocalOfOne();
omxData *data = estate->data;
for (int rx=0; rx < numUnique; rx++) {
int dups = omxDataNumIdenticalRows(data, estate->grp.rowMap[rx]);
for (int dup=0; dup < dups; dup++) {
int dest = omxDataIndex(data, estate->grp.rowMap[rx]+dup);
oo->matrix->data[dest] = patternLik[rx] * OneOverLargest;
}
}
} else {
double *rowWeight = estate->grp.rowWeight;
const double LogLargest = estate->LogLargestDouble;
double got = 0;
#pragma omp parallel for num_threads(Global->numThreads) reduction(+:got)
for (int ux=0; ux < numUnique; ux++) {
if (patternLik[ux] == 0) continue;
got += rowWeight[ux] * (log(patternLik[ux]) - LogLargest);
}
double fit = nan("infeasible");
if (estate->grp.excludedPatterns < numUnique) {
fit = Global->llScale * got;
// add in some badness for excluded patterns
fit += fit * estate->grp.excludedPatterns;
}
if (estate->verbose >= 1) mxLog("%s: observed fit %.4f (%d/%d excluded)",
oo->name(), fit, estate->grp.excludedPatterns, numUnique);
oo->matrix->data[0] = fit;
}
}
} else {
Rf_error("%s: Predict nothing or scores before computing %d", oo->name(), want);
}
}
void omxInitExpectationBA81(omxExpectation* oo) {
omxState* currentState = oo->currentState;
SEXP rObj = oo->rObj;
SEXP tmp;
if(OMX_DEBUG) {
mxLog("Initializing %s.", oo->name);
}
if (!Glibrpf_model) {
#if USE_EXTERNAL_LIBRPF
get_librpf_t get_librpf = (get_librpf_t) R_GetCCallable("rpf", "get_librpf_model_GPL");
(*get_librpf)(LIBIFA_RPF_API_VERSION, &Glibrpf_numModels, &Glibrpf_model);
#else
// if linking against included source code
Glibrpf_numModels = librpf_numModels;
Glibrpf_model = librpf_model;
#endif
}
BA81Expect *state = new BA81Expect;
// These two constants should be as identical as possible
state->name = oo->name;
if (0) {
state->LogLargestDouble = 0.0;
state->LargestDouble = 1.0;
} else {
state->LogLargestDouble = log(std::numeric_limits<double>::max()) - 1;
state->LargestDouble = exp(state->LogLargestDouble);
ba81NormalQuad &quad = state->getQuad();
quad.setOne(state->LargestDouble);
}
state->expectedUsed = false;
state->estLatentMean = NULL;
state->estLatentCov = NULL;
state->type = EXPECTATION_OBSERVED;
state->itemParam = NULL;
state->EitemParam = NULL;
state->itemParamVersion = 0;
state->latentParamVersion = 0;
oo->argStruct = (void*) state;
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("data")));
state->data = omxDataLookupFromState(tmp, currentState);
}
if (strcmp(omxDataType(state->data), "raw") != 0) {
omxRaiseErrorf("%s unable to handle data type %s", oo->name, omxDataType(state->data));
return;
}
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("verbose")));
state->verbose = Rf_asInteger(tmp);
}
int targetQpoints;
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("qpoints")));
targetQpoints = Rf_asInteger(tmp);
}
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("qwidth")));
state->grp.setGridFineness(Rf_asReal(tmp), targetQpoints);
}
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("ItemSpec")));
state->grp.importSpec(tmp);
if (state->verbose >= 2) mxLog("%s: found %d item specs", oo->name, state->numItems());
}
state->_latentMeanOut = omxNewMatrixFromSlot(rObj, currentState, "mean");
state->_latentCovOut = omxNewMatrixFromSlot(rObj, currentState, "cov");
state->itemParam = omxNewMatrixFromSlot(rObj, currentState, "item");
state->grp.param = state->itemParam->data; // algebra not allowed yet TODO
const int numItems = state->itemParam->cols;
if (state->numItems() != numItems) {
omxRaiseErrorf("ItemSpec length %d must match the number of item columns (%d)",
state->numItems(), numItems);
return;
}
if (state->itemParam->rows != state->grp.impliedParamRows) {
omxRaiseErrorf("item matrix must have %d rows", state->grp.impliedParamRows);
return;
}
state->grp.paramRows = state->itemParam->rows;
// for algebra item param, will need to defer until later?
state->grp.learnMaxAbilities();
int maxAbilities = state->grp.itemDims;
state->grp.setFactorNames(state->itemParam->rownames);
{
ProtectedSEXP tmp2(R_do_slot(rObj, Rf_install(".detectIndependence")));
state->grp.detectIndependence = Rf_asLogical(tmp2);
}
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("EstepItem")));
if (!Rf_isNull(tmp)) {
int rows, cols;
getMatrixDims(tmp, &rows, &cols);
if (rows != state->itemParam->rows || cols != state->itemParam->cols) {
Rf_error("EstepItem must have the same dimensions as the item MxMatrix");
}
state->EitemParam = REAL(tmp);
}
}
oo->computeFun = ba81compute;
oo->setVarGroup = ignoreSetVarGroup;
oo->destructFun = ba81Destroy;
oo->populateAttrFun = ba81PopulateAttributes;
oo->componentFun = getComponent;
oo->canDuplicate = false;
// TODO: Exactly identical rows do not contribute any information.
// The sorting algorithm ought to remove them so we get better cache behavior.
// The following summary stats would be cheaper to calculate too.
omxData *data = state->data;
if (data->hasDefinitionVariables()) Rf_error("%s: not implemented yet", oo->name);
std::vector<int> &rowMap = state->grp.rowMap;
int weightCol;
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("weightColumn")));
weightCol = INTEGER(tmp)[0];
}
if (weightCol == NA_INTEGER) {
// Should rowMap be part of omxData? This is essentially a
// generic compression step that shouldn't be specific to IFA models.
state->grp.rowWeight = (double*) R_alloc(data->rows, sizeof(double));
rowMap.resize(data->rows);
int numUnique = 0;
for (int rx=0; rx < data->rows; ) {
int rw = 1;
state->grp.rowWeight[numUnique] = rw;
rowMap[numUnique] = rx;
rx += rw;
++numUnique;
}
rowMap.resize(numUnique);
state->weightSum = state->data->rows;
}
else {
if (omxDataColumnIsFactor(data, weightCol)) {
omxRaiseErrorf("%s: weightColumn %d is a factor", oo->name, 1 + weightCol);
return;
}
state->grp.rowWeight = omxDoubleDataColumn(data, weightCol);
state->weightSum = 0;
for (int rx=0; rx < data->rows; ++rx) { state->weightSum += state->grp.rowWeight[rx]; }
rowMap.resize(data->rows);
for (size_t rx=0; rx < rowMap.size(); ++rx) {
rowMap[rx] = rx;
}
}
// complain about non-integral rowWeights (EAP can't work) TODO
auto colMap = oo->getDataColumns();
for (int cx = 0; cx < numItems; cx++) {
int *col = omxIntDataColumnUnsafe(data, colMap[cx]);
state->grp.dataColumns.push_back(col);
}
// sanity check data
for (int cx = 0; cx < numItems; cx++) {
if (!omxDataColumnIsFactor(data, colMap[cx])) {
data->omxPrintData("diagnostic", 3);
omxRaiseErrorf("%s: column %d is not a factor", oo->name, int(1 + colMap[cx]));
return;
}
}
// TODO the max outcome should be available from omxData
for (int rx=0; rx < data->rows; rx++) {
int cols = 0;
for (int cx = 0; cx < numItems; cx++) {
const int *col = state->grp.dataColumns[cx];
int pick = col[rx];
if (pick == NA_INTEGER) continue;
++cols;
const int no = state->grp.itemOutcomes[cx];
if (pick > no) {
Rf_error("Data for item '%s' has at least %d outcomes, not %d",
state->itemParam->colnames[cx], pick, no);
}
}
if (cols == 0) {
Rf_error("Row %d has all NAs", 1+rx);
}
}
if (state->_latentMeanOut && state->_latentMeanOut->rows * state->_latentMeanOut->cols != maxAbilities) {
Rf_error("The mean matrix '%s' must be a row or column vector of size %d",
state->_latentMeanOut->name(), maxAbilities);
}
if (state->_latentCovOut && (state->_latentCovOut->rows != maxAbilities ||
state->_latentCovOut->cols != maxAbilities)) {
Rf_error("The cov matrix '%s' must be %dx%d",
state->_latentCovOut->name(), maxAbilities, maxAbilities);
}
state->grp.setLatentDistribution(state->_latentMeanOut? state->_latentMeanOut->data : NULL,
state->_latentCovOut? state->_latentCovOut->data : NULL);
{
EigenArrayAdaptor Eparam(state->itemParam);
Eigen::Map< Eigen::VectorXd > meanVec(state->grp.mean, maxAbilities);
Eigen::Map< Eigen::MatrixXd > covMat(state->grp.cov, maxAbilities, maxAbilities);
state->grp.quad.setStructure(state->grp.qwidth, state->grp.qpoints,
Eparam, meanVec, covMat);
}
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("minItemsPerScore")));
state->grp.setMinItemsPerScore(Rf_asInteger(tmp));
}
state->grp.buildRowSkip();
if (isErrorRaised()) return;
{ScopedProtect p1(tmp, R_do_slot(rObj, Rf_install("debugInternal")));
state->debugInternal = Rf_asLogical(tmp);
}
state->ElatentVersion = 0;
if (state->_latentMeanOut) {
state->estLatentMean = omxInitMatrix(maxAbilities, 1, TRUE, currentState);
omxCopyMatrix(state->estLatentMean, state->_latentMeanOut); // rename matrices TODO
}
if (state->_latentCovOut) {
state->estLatentCov = omxInitMatrix(maxAbilities, maxAbilities, TRUE, currentState);
omxCopyMatrix(state->estLatentCov, state->_latentCovOut);
}
}
static void
ba81compute(omxExpectation *oo, FitContext *fc, const char *what, const char *how)
{
BA81Expect *state = (BA81Expect *) oo->argStruct;
if (what) {
if (strcmp(what, "latentDistribution")==0 && how && strcmp(how, "copy")==0) {
omxCopyMatrix(state->_latentMeanOut, state->estLatentMean);
omxCopyMatrix(state->_latentCovOut, state->estLatentCov);
double sampleSizeAdj = (state->weightSum - 1.0) / state->weightSum;
int covSize = state->_latentCovOut->rows * state->_latentCovOut->cols;
for (int cx=0; cx < covSize; ++cx) {
state->_latentCovOut->data[cx] *= sampleSizeAdj;
}
return;
}
if (strcmp(what, "scores")==0) {
state->expectedUsed = true;
state->type = EXPECTATION_AUGMENTED;
} else if (strcmp(what, "nothing")==0) {
state->type = EXPECTATION_OBSERVED;
} else {
omxRaiseErrorf("%s: don't know how to predict '%s'",
oo->name, what);
}
if (state->verbose >= 1) {
mxLog("%s: predict %s", oo->name, what);
}
return;
}
bool latentClean = state->latentParamVersion == getLatentVersion(state);
bool itemClean = state->itemParamVersion == omxGetMatrixVersion(state->itemParam) && latentClean;
ba81NormalQuad &quad = state->getQuad();
if (state->verbose >= 1) {
mxLog("%s: Qinit %d itemClean %d latentClean %d (1=clean) expectedUsed=%d",
oo->name, (int)quad.isAllocated(), itemClean, latentClean, state->expectedUsed);
}
if (!latentClean) {
ba81RefreshQuadrature(oo);
state->latentParamVersion = getLatentVersion(state);
}
if (!itemClean) {
double *param = state->EitemParam? state->EitemParam : state->itemParam->data;
state->grp.quad.cacheOutcomeProb(param, FALSE);
bool estep = state->expectedUsed;
if (estep) {
if (oo->dynamicDataSource) {
BA81Engine<BA81Expect*, BA81LatentSummary, BA81Estep> engine;
engine.ba81Estep1(&state->grp, state);
} else {
BA81Engine<BA81Expect*, BA81LatentFixed, BA81Estep> engine;
engine.ba81Estep1(&state->grp, state);
}
} else {
state->grp.quad.releaseEstep();
refreshPatternLikelihood(state, oo->dynamicDataSource);
}
if (oo->dynamicDataSource && state->verbose >= 2) {
mxLog("%s: empirical distribution mean and cov:", state->name);
omxPrint(state->estLatentMean, "mean");
omxPrint(state->estLatentCov, "cov");
}
if (state->verbose >= 1) {
const int numUnique = state->getNumUnique();
mxLog("%s: estep<%s, %s> %d/%d rows excluded",
state->name,
(estep && oo->dynamicDataSource? "summary":"fixed"),
(estep? "estep":"omitEstep"),
state->grp.excludedPatterns, numUnique);
}
}
state->itemParamVersion = omxGetMatrixVersion(state->itemParam);
}