inline
umat
sort_index
(
const Base<typename T1::elem_type,T1>& X,
const uword sort_type = 0,
const typename arma_not_cx<typename T1::elem_type>::result* junk = 0
)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const unwrap<T1> tmp(X.get_ref());
const Mat<eT>& A = tmp.M;
if(A.is_empty() == true)
{
return umat();
}
arma_debug_check( (A.is_vec() == false), "sort_index(): currently only handles vectors");
typedef typename umat::elem_type out_elem_type;
umat out(A.n_rows, A.n_cols);
if(sort_type == 0)
{
std::vector< arma_sort_index_packet_ascend<eT,out_elem_type> > packet_vec(A.n_elem);
sort_index_helper(out.memptr(), packet_vec, A.mem);
}
else
{
std::vector< arma_sort_index_packet_descend<eT,out_elem_type> > packet_vec(A.n_elem);
sort_index_helper(out.memptr(), packet_vec, A.mem);
}
return out;
}
void
inline
sort_index_helper(umat_elem_type* out_mem, const eT* in_mem, const uword n_elem)
{
arma_extra_debug_sigprint();
std::vector< arma_sort_index_packet<eT, umat_elem_type> > packet_vec(n_elem);
for(uword i=0; i<n_elem; ++i)
{
packet_vec[i].val = in_mem[i];
packet_vec[i].index = i;
}
if(sort_type == 0)
{
// ascend
arma_sort_index_helper_ascend comparator;
if(sort_stable == 0)
{
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
}
else
{
std::stable_sort( packet_vec.begin(), packet_vec.end(), comparator );
}
}
else
{
// descend
arma_sort_index_helper_descend comparator;
if(sort_stable == 0)
{
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
}
else
{
std::stable_sort( packet_vec.begin(), packet_vec.end(), comparator );
}
}
for(uword i=0; i<n_elem; ++i)
{
out_mem[i] = packet_vec[i].index;
}
}
/**
* Search the N nearest Neighbor of the scalar array query.
*
* \param[in] query The query array
* \param[in] nbQuery The number of query rows
* \param[out] indices The corresponding (query, neighbor) indices
* \param[out] distances The distances between the matched arrays.
* \param[out] NN The number of maximal neighbor that will be searched.
*
* \return True if success.
*/
bool SearchNeighbours
(
const Scalar * query, int nbQuery,
IndMatches * pvec_indices,
std::vector<DistanceType> * pvec_distances,
size_t NN
) override
{
if (memMapping.get() == nullptr)
{
return false;
}
if (NN > (*memMapping).rows() || nbQuery < 1)
{
return false;
}
//matrix representation of the input data;
Eigen::Map<BaseMat> mat_query((Scalar*)query, nbQuery, (*memMapping).cols());
Metric metric;
pvec_distances->resize(nbQuery * NN);
pvec_indices->resize(nbQuery * NN);
#ifdef OPENMVG_USE_OPENMP
#pragma omp parallel for schedule(dynamic)
#endif
for (int queryIndex=0; queryIndex < nbQuery; ++queryIndex)
{
std::vector<DistanceType> vec_distance((*memMapping).rows(), 0.0);
const Scalar * queryPtr = mat_query.row(queryIndex).data();
const Scalar * rowPtr = (*memMapping).data();
for (int i = 0; i < (*memMapping).rows(); ++i)
{
vec_distance[i] = metric( queryPtr,
rowPtr, (*memMapping).cols() );
rowPtr += (*memMapping).cols();
}
// Find the N minimum distances:
const int maxMinFound = (int) min( size_t(NN), vec_distance.size());
std::vector< stl::indexed_sort::sort_index_packet_ascend< DistanceType, int> > packet_vec(vec_distance.size());
stl::indexed_sort::sort_index_helper(packet_vec, &vec_distance[0], maxMinFound);
for (int i = 0; i < maxMinFound; ++i)
{
(*pvec_distances)[queryIndex*NN+i] = packet_vec[i].val;
(*pvec_indices)[queryIndex*NN+i] = IndMatch(queryIndex, packet_vec[i].index);
}
}
return true;
};
inline
void
op_shuffle::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_shuffle>& in)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const unwrap<T1> tmp(in.m);
const Mat<eT>& X = tmp.M;
if(X.is_empty()) { out.copy_size(X); return; }
const uword dim = in.aux_uword_a;
const uword N = (dim == 0) ? X.n_rows : X.n_cols;
// see "fn_sort_index.hpp" for the definition of "arma_sort_index_packet"
// and the associated comparison functor
std::vector< arma_sort_index_packet<int,uword> > packet_vec(N);
for(uword i=0; i<N; ++i)
{
packet_vec[i].val = std::rand();
packet_vec[i].index = i;
}
arma_sort_index_helper_ascend comparator;
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
const bool is_alias = (&out == &X);
if(X.is_vec() == false)
{
if(is_alias == false)
{
arma_extra_debug_print("op_shuffle::apply(): matrix");
out.copy_size(X);
if(dim == 0)
{
for(uword i=0; i<N; ++i) { out.row(i) = X.row(packet_vec[i].index); }
}
else
{
for(uword i=0; i<N; ++i) { out.col(i) = X.col(packet_vec[i].index); }
}
}
else // in-place shuffle
{
arma_extra_debug_print("op_shuffle::apply(): in-place matrix");
// reuse the val member variable of packet_vec
// to indicate whether a particular row or column
// has already been shuffled
for(uword i=0; i<N; ++i)
{
packet_vec[i].val = 0;
}
if(dim == 0)
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
out.swap_rows(i, j);
packet_vec[j].val = 1;
}
}
}
else
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
out.swap_cols(i, j);
packet_vec[j].val = 1;
}
}
}
}
}
else // we're dealing with a vector
{
if(is_alias == false)
{
arma_extra_debug_print("op_shuffle::apply(): vector");
out.copy_size(X);
if(dim == 0)
{
if(X.n_rows > 1) // i.e. column vector
{
for(uword i=0; i<N; ++i) { out[i] = X[ packet_vec[i].index ]; }
}
else
{
out = X;
}
}
else
{
if(X.n_cols > 1) // i.e. row vector
{
for(uword i=0; i<N; ++i) { out[i] = X[ packet_vec[i].index ]; }
}
else
{
out = X;
}
}
}
else // in-place shuffle
{
arma_extra_debug_print("op_shuffle::apply(): in-place vector");
// reuse the val member variable of packet_vec
// to indicate whether a particular row or column
// has already been shuffled
for(uword i=0; i<N; ++i)
{
packet_vec[i].val = 0;
}
if(dim == 0)
{
if(X.n_rows > 1) // i.e. column vector
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
std::swap(out[i], out[j]);
packet_vec[j].val = 1;
}
}
}
}
else
{
if(X.n_cols > 1) // i.e. row vector
{
for(uword i=0; i<N; ++i)
{
if(packet_vec[i].val == 0)
{
const uword j = packet_vec[i].index;
std::swap(out[i], out[j]);
packet_vec[j].val = 1;
}
}
}
}
}
}
}
inline
bool
op_find_unique::apply_helper(Mat<uword>& out, const Proxy<T1>& P, const bool ascending_indices)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
const uword n_elem = P.get_n_elem();
if(n_elem == 0) {
out.set_size(0,1);
return true;
}
if(n_elem == 1) {
out.set_size(1,1);
out[0] = 0;
return true;
}
uvec indices(n_elem);
std::vector< arma_find_unique_packet<eT> > packet_vec(n_elem);
if(Proxy<T1>::prefer_at_accessor == false)
{
typename Proxy<T1>::ea_type Pea = P.get_ea();
for(uword i=0; i<n_elem; ++i)
{
const eT val = Pea[i];
if(arma_isnan(val)) {
return false;
}
packet_vec[i].val = val;
packet_vec[i].index = i;
}
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
uword i = 0;
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
const eT val = P.at(row,col);
if(arma_isnan(val)) {
return false;
}
packet_vec[i].val = val;
packet_vec[i].index = i;
++i;
}
}
arma_find_unique_comparator<eT> comparator;
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
uword* indices_mem = indices.memptr();
indices_mem[0] = packet_vec[0].index;
uword count = 1;
for(uword i=1; i < n_elem; ++i)
{
const eT diff = packet_vec[i-1].val - packet_vec[i].val;
if(diff != eT(0))
{
indices_mem[count] = packet_vec[i].index;
++count;
}
}
out.steal_mem_col(indices,count);
if(ascending_indices) {
std::sort(out.begin(), out.end());
}
return true;
}
inline
bool
arma_sort_index_helper(Mat<uword>& out, const Proxy<T1>& P, const uword sort_type, typename arma_not_cx<typename T1::elem_type>::result* junk = 0)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
typedef typename T1::elem_type eT;
const uword n_elem = P.get_n_elem();
out.set_size(n_elem, 1);
std::vector< arma_sort_index_packet<eT, uword> > packet_vec(n_elem);
if(Proxy<T1>::prefer_at_accessor == false)
{
for(uword i=0; i<n_elem; ++i)
{
const eT val = P[i];
if(arma_isnan(val)) { out.reset(); return false; }
packet_vec[i].val = val;
packet_vec[i].index = i;
}
}
else
{
const uword n_rows = P.get_n_rows();
const uword n_cols = P.get_n_cols();
uword i = 0;
for(uword col=0; col < n_cols; ++col)
for(uword row=0; row < n_rows; ++row)
{
const eT val = P.at(row,col);
if(arma_isnan(val)) { out.reset(); return false; }
packet_vec[i].val = val;
packet_vec[i].index = i;
++i;
}
}
if(sort_type == 0)
{
// ascend
arma_sort_index_helper_ascend comparator;
if(sort_stable == false)
{
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
}
else
{
std::stable_sort( packet_vec.begin(), packet_vec.end(), comparator );
}
}
else
{
// descend
arma_sort_index_helper_descend comparator;
if(sort_stable == false)
{
std::sort( packet_vec.begin(), packet_vec.end(), comparator );
}
else
{
std::stable_sort( packet_vec.begin(), packet_vec.end(), comparator );
}
}
uword* out_mem = out.memptr();
for(uword i=0; i<n_elem; ++i)
{
out_mem[i] = packet_vec[i].index;
}
return true;
}