Hello,
I'm very sorry to post a repeat request. i know you all are very busy, but for
the life of me, I cannot get mlpack code - or the library itself - to compile
correctly on my system. I'm reposting my previous message in the hopes in won't
get lost in the transition between August and September posts. I've done quite
a bit of coding and have not run into this issue before.
Begin repost:
Hello,
I've installed mlpack-3.1.1 and mlpack-devel in /usr/include/mlpack (headers)
and /usr/lib64/libmlpack.so using yum on Fedora 7.6.
I've tried to compile the following example code ( compiling with g++ (GCC)
9.2.0)
_______________
#include <mlpack/core.hpp>
#include <mlpack/methods/neighbor_search/neighbor_search.hpp>
#include <mlpack/core/data/load.hpp>
using namespace mlpack;
using namespace mlpack::neighbor; // NeighborSearch and NearestNeighborSort
using namespace mlpack::metric; // ManhattanDistance
int main()
{
arma::mat data;
data::Load("data.csv", data, true);
NeighborSearch<NearestNeighborSort, ManhattanDistance> nn(data);
arma::Mat<size_t> neighbors;
arma::mat distances;
nn.Search(1, neighbors, distances);
for (size_t i = 0; i < neighbors.n_elem; ++i)
{
std::cout << "Nearest neighbor of point " << i << " is point "
<< neighbors[i] << " and the distance is " << distances[i] << ".\n";
}
}
__________
When I tried to compile this code with:
g++ knn_example.cpp -o knn_example -std=c++11 -larmadillo -lmlpack
-lboost_serialization -fopenmp
or with
g++ knn_example.cpp -o knn_example -std=c++11 -larmadillo -lmlpack
-lboost_serialization -fopenmp -I/usr/include/ -L/usr/lib64
, the error I get is as follows:
/tmp/cckP4kAv.o: In function `main':
knn_example.cpp:(.text+0x317): undefined reference to `bool
mlpack::data::Load<double>(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&, arma::Mat<double>&,
bool, bool)'
/tmp/cckP4kAv.o: In function
`mlpack::neighbor::NeighborSearch<mlpack::neighbor::NearestNS,
mlpack::metric::LMetric<1, false>, arma::Mat<double>, mlpack::tree::KDTree,
mlpack::tree::BinarySpaceTree<mlpack::metric::LMetric<1, false>,
mlpack::neighbor::NeighborSearchStat<mlpack::neighbor::NearestNS>,
arma::Mat<double>, mlpack::bound::HRectBound,
mlpack::tree::MidpointSplit>::DualTreeTraverser,
mlpack::tree::BinarySpaceTree<mlpack::metric::LMetric<1, false>,
mlpack::neighbor::NeighborSearchStat<mlpack::neighbor::NearestNS>,
arma::Mat<double>, mlpack::bound::HRectBound,
mlpack::tree::MidpointSplit>::SingleTreeTraverser>::Search(unsigned long,
arma::Mat<unsigned long>&, arma::Mat<double>&)':
knn_example.cpp:(.text._ZN6mlpack8neighbor14NeighborSearchINS0_9NearestNSENS_6metric7LMetricILi1ELb0EEEN4arma3MatIdEENS_4tree6KDTreeENS9_15BinarySpaceTreeIS5_NS0_18NeighborSearchStatIS2_EES8_NS_5bound10HRectBoundENS9_13MidpointSplitEE17DualTreeTraverserENSH_19SingleTreeTraverserEE6SearchEmRNS7_ImEERS8_[_ZN6mlpack8neighbor14NeighborSearchINS0_9NearestNSENS_6metric7LMetricILi1ELb0EEEN4arma3MatIdEENS_4tree6KDTreeENS9_15BinarySpaceTreeIS5_NS0_18NeighborSearchStatIS2_EES8_NS_5bound10HRectBoundENS9_13MidpointSplitEE17DualTreeTraverserENSH_19SingleTreeTraverserEE6SearchEmRNS7_ImEERS8_]+0x256):
undefined reference to `mlpack::Timer::Start(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&)'
knn_example.cpp:(.text._ZN6mlpack8neighbor14NeighborSearchINS0_9NearestNSENS_6metric7LMetricILi1ELb0EEEN4arma3MatIdEENS_4tree6KDTreeENS9_15BinarySpaceTreeIS5_NS0_18NeighborSearchStatIS2_EES8_NS_5bound10HRectBoundENS9_13MidpointSplitEE17DualTreeTraverserENSH_19SingleTreeTraverserEE6SearchEmRNS7_ImEERS8_[_ZN6mlpack8neighbor14NeighborSearchINS0_9NearestNSENS_6metric7LMetricILi1ELb0EEEN4arma3MatIdEENS_4tree6KDTreeENS9_15BinarySpaceTreeIS5_NS0_18NeighborSearchStatIS2_EES8_NS_5bound10HRectBoundENS9_13MidpointSplitEE17DualTreeTraverserENSH_19SingleTreeTraverserEE6SearchEmRNS7_ImEERS8_]+0xb15):
undefined reference to `mlpack::Timer::Stop(std::__cxx11::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&)'
/tmp/cckP4kAv.o: In function
`mlpack::bound::HRectBound<mlpack::metric::LMetric<1, false>, double>&
mlpack::bound::HRectBound<mlpack::metric::LMetric<1, false>,
double>::operator|=<arma::subview<double> >(arma::subview<double> const&)':
knn_example.cpp:(.text._ZN6mlpack5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdEoRIN4arma7subviewIdEEEERS5_RKT_[_ZN6mlpack5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdEoRIN4arma7subviewIdEEEERS5_RKT_]+0x6f):
undefined reference to `mlpack::Log::Assert(bool,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&)'
/tmp/cckP4kAv.o: In function `unsigned long
mlpack::tree::split::PerformSplit<arma::Mat<double>,
mlpack::tree::MidpointSplit<mlpack::bound::HRectBound<mlpack::metric::LMetric<1,
false>, double>, arma::Mat<double> > >(arma::Mat<double>&, unsigned long,
unsigned long,
mlpack::tree::MidpointSplit<mlpack::bound::HRectBound<mlpack::metric::LMetric<1,
false>, double>, arma::Mat<double> >::SplitInfo const&, std::vector<unsigned
long, std::allocator<unsigned long> >&)':
knn_example.cpp:(.text._ZN6mlpack4tree5split12PerformSplitIN4arma3MatIdEENS0_13MidpointSplitINS_5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdEES5_EEEEmRT_mmRKNT0_9SplitInfoERSt6vectorImSaImEE[_ZN6mlpack4tree5split12PerformSplitIN4arma3MatIdEENS0_13MidpointSplitINS_5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdEES5_EEEEmRT_mmRKNT0_9SplitInfoERSt6vectorImSaImEE]+0x40a):
undefined reference to `mlpack::Log::Assert(bool,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&)'
/tmp/cckP4kAv.o: In function `double
mlpack::bound::HRectBound<mlpack::metric::LMetric<1, false>,
double>::MinDistance<arma::subview_col<double> >(arma::subview_col<double>
const&, std::enable_if<IsVector<arma::subview_col<double> >::value,
void>::type*) const':
knn_example.cpp:(.text._ZNK6mlpack5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdE11MinDistanceIN4arma11subview_colIdEEEEdRKT_PNSt9enable_ifIXsr8IsVectorISA_E5valueEvE4typeE[_ZNK6mlpack5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdE11MinDistanceIN4arma11subview_colIdEEEEdRKT_PNSt9enable_ifIXsr8IsVectorISA_E5valueEvE4typeE]+0x6a):
undefined reference to `mlpack::Log::Assert(bool,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&)'
/tmp/cckP4kAv.o: In function
`mlpack::bound::HRectBound<mlpack::metric::LMetric<1, false>,
double>::MinDistance(mlpack::bound::HRectBound<mlpack::metric::LMetric<1,
false>, double> const&) const':
knn_example.cpp:(.text._ZNK6mlpack5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdE11MinDistanceERKS5_[_ZNK6mlpack5bound10HRectBoundINS_6metric7LMetricILi1ELb0EEEdE11MinDistanceERKS5_]+0x56):
undefined reference to `mlpack::Log::Assert(bool,
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >
const&)'
collect2: error: ld returned 1 exit status
_________________________
I'm hoping someone may be able to help with this compilation issue.
I've also tried compiling mlpack itself from source using boost_1_71_0, but
even after giving cmake the BOOST_ROOT, boost is not linking appropriately when
'make' is run. Although this is a separate issue, if anyone has suggestions
about either of these approaches to using mlpack, I'd be very grateful.
Regards,
David
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