inline void PackedVector::resize(size_t new_size) {
if (new_size < filled) {
size_t shrink_capacity = vec.size() / (factor * factor);
if (new_size < shrink_capacity) {
sdsl::int_vector<> tmp;
tmp.width(vec.width());
tmp.resize(new_size);
for (size_t i = 0; i < new_size; i++) {
tmp[i] = vec[i];
}
vec = std::move(tmp);
}
}
else if (new_size > vec.size()) {
size_t new_capacity = std::max<size_t>(size_t(vec.size() * factor) + 1, new_size);
sdsl::int_vector<> tmp;
tmp.width(vec.width());
tmp.resize(new_capacity);
for (size_t i = 0; i < filled; i++) {
tmp[i] = vec[i];
}
vec = std::move(tmp);
}
filled = new_size;
}
size_type serialize(std::ostream& out, sdsl::structure_tree_node* v=NULL, std::string name="")const
{
(void)name;
auto size = m_sa.serialize(out, v, "sa");
size += m_text.serialize(out, v, "text");
return size;
}
void swap(index_bstree& ir)
{
if (this != &ir) {
m_sa.swap(ir.m_sa);
m_text.swap(ir.m_text);
}
}
Alphabet::Alphabet(const sdsl::int_vector<64>& counts,
const sdsl::int_vector<8>& _char2comp, const sdsl::int_vector<8>& _comp2char) :
char2comp(_char2comp), comp2char(_comp2char),
C(_comp2char.size() + 1, 0),
sigma(_comp2char.size())
{
for(size_type i = 0; i < counts.size(); i++) { this->C[i + 1] = this->C[i] + counts[i]; }
}
gapped_search_result
search(const gapped_pattern& pat) const
{
gapped_search_result res;
const vector<string_type>& s = pat.subpatterns;
size_type min_gap;
size_type max_gap;
std::cerr << "REGEX ::: " << pat.raw_regexp << std::endl;
min_gap = s[0].size() + pat.gaps[0].first;
max_gap = s[0].size() + pat.gaps[0].second;
auto last_size = s[s.size() - 1].size();
// get ranges
vector<sdsl::int_vector_const_iterator<sdsl::int_vector<0>>::const_iterator> its;
vector<sdsl::int_vector_const_iterator<sdsl::int_vector<0>>::const_iterator> its2;
for (auto sx : s) {
size_type sp, ep;
forward_search(m_text.begin(), m_text.end(), m_sa, 0, m_sa.size()-1, sx.begin(), sx.end(), sp, ep);
its.push_back(m_sa.begin() + sp);
its2.push_back(m_sa.begin() + ep + 1);
}
vector<pii> spans1, spans2;
for (auto it = its[0]; it != its2[0]; ++it)
spans1.emplace_back(*it, *it);
auto pspan1 = &spans1;
auto pspan2 = &spans2;
// incremental search
for (size_t i = 1; i < its.size(); ++i) {
std::sort(pspan1->begin(), pspan1->end());
pspan2->clear();
for (auto it = its[i]; it != its2[i]; ++it) {
auto pos = *it;
for (auto pot_match = lower_bound(pspan1->begin(), pspan1->end(), make_pair(pos - max_gap, pos));
pot_match != pspan1->end() && pot_match->first <= pos - min_gap;
++pot_match)
pspan2->emplace_back(pos, pot_match->second);
}
std::swap(pspan1, pspan2);
}
std::sort(pspan1->begin(), pspan1->end(), [](const pii &left, const pii &right) { return left.second < right.second; });
for (auto it = pspan1->begin(); it != pspan1->end(); ++it) {
res.positions.push_back(it->second);
auto end = it->first + last_size;
while (it != pspan1->end() && it->second < end)
++it;
}
return res;
}
inline void PackedVector::reserve(const size_t& future_size) {
if (future_size > vec.size()) {
sdsl::int_vector<> tmp;
tmp.width(vec.width());
tmp.resize(future_size);
for (size_t i = 0; i < filled; i++) {
tmp[i] = vec[i];
}
vec = std::move(tmp);
}
}
rank_tfidf(cache_config& cconfig) {
load_from_cache(num_terms, surf::KEY_COLLEN, cconfig);
if (!cache_file_exists(surf::KEY_DOC_LENGTHS, cconfig)){
surf::construct_doc_lengths<sdsl::int_alphabet_tag::WIDTH>(cconfig);
}
load_from_cache(doc_lengths, surf::KEY_DOC_LENGTHS, cconfig);
num_docs = doc_lengths.size();
std::cerr<<"num_docs = "<<num_docs<<std::endl;
auto min_itr = std::min_element(doc_lengths.begin(),doc_lengths.end());
min_doc_len = *min_itr;
std::cerr<<"min_doc_len = "<<min_doc_len<<std::endl;
}
index_bstree(collection& col)
{
sdsl::load_from_file(m_text, col.file_map[consts::KEY_TEXT]);
sdsl::csa_wt<sdsl::wt_huff<>, 1> csa;
sdsl::construct(csa, col.file_map[consts::KEY_TEXT], 0);
m_sa = sdsl::int_vector<>(csa.size(), 0, sdsl::bits::hi(csa.size() - 1) + 1);
std::copy(csa.begin(), csa.end(), m_sa.begin());
}
void load(std::ifstream& ifs)
{
sdsl::read_member(num_docs,ifs);
sdsl::read_member(num_terms,ifs);
sdsl::read_member(avg_doc_len,ifs);
LOG(INFO) << "num docs : " << num_docs;
LOG(INFO) << "num terms : " << num_terms;
LOG(INFO) << "avg doc len : " << avg_doc_len;
doc_lengths.load(ifs);
}
size_type serialize(std::ostream& out, sdsl::structure_tree_node* v=NULL, std::string name="") const
{
sdsl::structure_tree_node* child = sdsl::structure_tree::add_child(v, name, sdsl::util::class_name(*this));
size_type written_bytes = 0;
written_bytes += sdsl::write_member(num_docs,out,child,"num_docs");
written_bytes += sdsl::write_member(num_terms,out,child,"num_terms");
written_bytes += sdsl::write_member(avg_doc_len,out,child,"avg_doc_len");
written_bytes += doc_lengths.serialize(out,child,"doc lengths");
sdsl::structure_tree::add_size(child, written_bytes);
return written_bytes;
}
rank_bm25(cache_config& cconfig) {
uint64_t num_terms;
load_from_cache(num_terms, surf::KEY_COLLEN, cconfig);
if (!cache_file_exists(surf::KEY_DOC_LENGTHS, cconfig)){
surf::construct_doc_lengths<sdsl::int_alphabet_tag::WIDTH>(cconfig);
}
load_from_cache(doc_lengths, surf::KEY_DOC_LENGTHS, cconfig);
num_docs = doc_lengths.size();
std::cerr<<"num_docs = "<<num_docs<<std::endl;
avg_doc_len = (double)num_terms / (double)num_docs;
std::cerr<<"avg_doc_len = "<<avg_doc_len<<std::endl;
}
inline void PackedVector::set(const size_t& i, const uint64_t& value) {
assert(i < filled);
uint8_t width = vec.width();
uint64_t mask = std::numeric_limits<uint64_t>::max() << width;
while (mask & value) {
width++;
mask = std::numeric_limits<uint64_t>::max() << width;
}
if (width > vec.width()) {
sdsl::int_vector<> wider_vec;
wider_vec.width(width);
wider_vec.resize(vec.size());
for (size_t i = 0; i < filled; i++) {
wider_vec[i] = vec[i];
}
vec = std::move(wider_vec);
}
vec[i] = value;
}
rank_bm25(collection& col)
{
load_from_file(doc_lengths,col.file_map[KEY_DOCLEN]);
num_docs = doc_lengths.size();
{
sdsl::int_vector_mapper<> text(col.file_map[KEY_TEXT]);
num_terms = text.size() - num_docs;
}
avg_doc_len = (double)num_terms / (double)num_docs;
LOG(INFO) << "num docs : " << num_docs;
LOG(INFO) << "avg doc len : " << avg_doc_len;
}
inline void PackedVector::clear() {
vec.resize(0);
vec.width(1);
filled = 0;
}
void load(std::istream& in)
{
m_sa.load(in);
m_text.load(in);
}
