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Fixed warnings, comments, and removed redundant debug code in Cholesky

release/4.3a0
Richard Roberts 2011-02-15 15:21:09 +00:00
parent a5e14f2c47
commit 09f25edcbb
1 changed files with 14 additions and 89 deletions
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103
gtsam/base/cholesky.cpp
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@ -126,9 +126,10 @@ size_t choleskyFactorUnderdetermined(MatrixColMajor& Ab, size_t nFrontal) {
/* ************************************************************************* */
static inline bool choleskyStep(MatrixColMajor& ATA, size_t k, size_t order) {
const size_t n = ATA.size1();
// Get pivot value
double alpha = ATA(k,k);
// Correct negative pivots from round-off error
if(alpha < negativePivotThreshold) {
cout << "pivot = " << alpha << endl;
print(ATA, "Partially-factorized matrix: ");
@ -158,6 +159,7 @@ static inline bool choleskyStep(MatrixColMajor& ATA, size_t k, size_t order) {
return true;
} else {
// For zero pivots, add the underconstrained variable prior
ATA(k,k) = underconstrainedPrior;
for(size_t j=k+1; j<order; ++j)
ATA(k,j) = 0.0;
@ -170,28 +172,25 @@ pair<size_t,bool> choleskyCareful(MatrixColMajor& ATA, int order) {
const bool debug = ISDEBUG("choleskyCareful");
// // Tolerance for being equal to zero
//// static const double zeroTol = numeric_limits<double>::epsilon();
// static const double zeroTol = 1.e-15;
// Check that the matrix is square (we do not check for symmetry)
assert(ATA.size1() == ATA.size2());
// Number of rows/columns
const size_t n = ATA.size1();
// Negative order means factor the entire matrix
if(order < 0)
order = n;
assert(order <= n);
assert(size_t(order) <= n);
// The index of the row after the last non-zero row of the square-root factor
size_t maxrank = 0;
bool fullRank = true;
for(size_t k = 0; k < order; ++k) {
if(choleskyStep(ATA, k, order)) {
// Factor row-by-row
for(size_t k = 0; k < size_t(order); ++k) {
if(choleskyStep(ATA, k, size_t(order))) {
if(debug) cout << "choleskyCareful: Factored through " << k << endl;
if(debug) print(ATA, "ATA: ");
maxrank = k+1;
@ -212,54 +211,15 @@ void choleskyPartial(MatrixColMajor& ABCublas, size_t nFrontal) {
Eigen::Map<Eigen::MatrixXd> ABC(&ABCublas(0,0), ABCublas.size1(), ABCublas.size2());
assert(ABC.rows() == ABC.cols());
assert(nFrontal <= ABC.rows());
assert(ABC.rows() >= 0 && nFrontal <= size_t(ABC.rows()));
const size_t n = ABC.rows();
// Compute Cholesky factorization of A, overwrites A.
tic(1, "lld");
ABC.block(0,0,nFrontal,nFrontal).triangularView<Eigen::Upper>() =
ABC.block(0,0,nFrontal,nFrontal).selfadjointView<Eigen::Upper>().llt().matrixU();
toc(1, "lld");
#if 0
if(true) {
tic(1, "dpotrf");
int info = lapack_dpotrf('U', nFrontal, &ABC(0,0), n);
if(info != 0) {
if(info < 0)
throw std::domain_error(boost::str(boost::format(
"Bad input to choleskyPartial, dpotrf returned %d.\n")%info));
else
throw std::domain_error(boost::str(boost::format(
"The matrix passed into choleskyPartial is numerically rank-deficient, dpotrf returned rank=%d, expected rank was %d.\n")%(info-1)%nFrontal));
}
toc(1, "dpotrf");
} else {
tic(1, "choleskyCareful");
bool fullRank = choleskyCareful(ABC, nFrontal).second;
if(!fullRank)
throw invalid_argument("Rank-deficient");
toc(1, "choleskyCareful");
}
#endif
#ifndef NDEBUG
// Check for non-finite values
for(size_t i=0; i<ABC.rows(); ++i)
for(size_t j=0; j<ABC.cols(); ++j)
if(!isfinite(ABC(i,j))) {
cout << nFrontal << " frontal variables" << endl;
cout << "Partially-factored matrix: " << ABC << endl;
throw invalid_argument("After dpotrf, matrix contains non-finite matrix entries.");
}
#endif
// Views of R, S, and L submatrices.
// ublas::matrix_range<MatrixColMajor> Rf(ublas::project(ABC, ublas::range(0,nFrontal), ublas::range(0,nFrontal)));
// ublas::triangular_adaptor<ublas::matrix_range<MatrixColMajor>, ublas::upper> R(Rf);
// ublas::matrix_range<MatrixColMajor> S(ublas::project(ABC, ublas::range(0,nFrontal), ublas::range(nFrontal,n)));
// ublas::matrix_range<MatrixColMajor> Lf(ublas::project(ABC, ublas::range(nFrontal,n), ublas::range(nFrontal,n)));
// ublas::symmetric_adaptor<typeof(Lf), ublas::upper> L(Lf);
tic(1, "lld");
ABC.block(0,0,nFrontal,nFrontal).triangularView<Eigen::Upper>() =
ABC.block(0,0,nFrontal,nFrontal).selfadjointView<Eigen::Upper>().llt().matrixU();
toc(1, "lld");
if(debug) cout << "R:\n" << Eigen::MatrixXd(ABC.topLeftCorner(nFrontal,nFrontal).triangularView<Eigen::Upper>()) << endl;
@ -268,53 +228,18 @@ void choleskyPartial(MatrixColMajor& ABCublas, size_t nFrontal) {
if(n - nFrontal > 0) {
ABC.topLeftCorner(nFrontal,nFrontal).triangularView<Eigen::Upper>().transpose().solveInPlace(
ABC.topRightCorner(nFrontal, n-nFrontal));
// typeof(ublas::trans(R)) RT(ublas::trans(R));
// ublas::inplace_solve(RT, S, ublas::lower_tag());
}
if(debug) cout << "S:\n" << ABC.topRightCorner(nFrontal, n-nFrontal) << endl;
toc(2, "compute S");
#ifndef NDEBUG
// Check for non-finite values
for(size_t i=0; i<ABC.rows(); ++i)
for(size_t j=0; j<ABC.cols(); ++j)
if(!isfinite(ABC(i,j))) {
cout << nFrontal << " frontal variables" << endl;
cout << "Partially-factored matrix: " << ABC << endl;
throw invalid_argument("After computing S, matrix contains non-finite matrix entries.");
}
#endif
// Compute L = C - S' * S
tic(3, "compute L");
if(debug) cout << "C:\n" << Eigen::MatrixXd(ABC.bottomRightCorner(n-nFrontal,n-nFrontal).selfadjointView<Eigen::Upper>()) << endl;
if(n - nFrontal > 0)
ABC.bottomRightCorner(n-nFrontal,n-nFrontal).selfadjointView<Eigen::Upper>().rankUpdate(
ABC.topRightCorner(nFrontal, n-nFrontal).transpose(), -1.0);
// L -= ublas::prod(ublas::trans(S), S);
if(debug) cout << "L:\n" << Eigen::MatrixXd(ABC.bottomRightCorner(n-nFrontal,n-nFrontal).selfadjointView<Eigen::Upper>()) << endl;
toc(3, "compute L");
#ifndef NDEBUG
// // Check for positive semi-definiteness of L
// try {
// MatrixColMajor Lf(L);
// choleskyCareful(Lf);
// } catch(const invalid_argument& e) {
// cout << "Remaining Hessian L is not positive semi-definite: " << e.what() << endl;
// throw runtime_error("Remaining Hessian L is not positive semi-definite");
// }
// Check for non-finite values
// Check for non-finite values
for(size_t i=0; i<ABC.rows(); ++i)
for(size_t j=0; j<ABC.cols(); ++j)
if(!isfinite(ABC(i,j))) {
cout << nFrontal << " frontal variables" << endl;
cout << "Partially-factored matrix: " << ABC << endl;
throw invalid_argument("After computing S, matrix contains non-finite matrix entries.");
}
#endif
}
}