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-rw-r--r--decoder/tromble_loss.cc309
1 files changed, 0 insertions, 309 deletions
diff --git a/decoder/tromble_loss.cc b/decoder/tromble_loss.cc
deleted file mode 100644
index 24cfef5f..00000000
--- a/decoder/tromble_loss.cc
+++ /dev/null
@@ -1,309 +0,0 @@
-#include "tromble_loss.h"
-#include "fast_lexical_cast.hpp"
-
-#include <boost/algorithm/string/predicate.hpp>
-#include <boost/circular_buffer.hpp>
-#include <boost/functional/hash.hpp>
-#include <boost/range/iterator_range.hpp>
-#include <boost/tokenizer.hpp>
-#include <boost/unordered_map.hpp>
-
-#include <cmath>
-#include <fstream>
-#include <vector>
-
-#include "sentence_metadata.h"
-#include "trule.h"
-#include "tdict.h"
-
-using namespace std;
-
-namespace {
-
-typedef unsigned char GramCount;
-
-struct RefCounts {
- GramCount max;
- std::vector<GramCount> refs;
- size_t length;
-};
-
-typedef boost::unordered_map<std::vector<WordID>, size_t, boost::hash<std::vector<WordID> > > NGramMap;
-
-// Take all the n-grams in the references and stuff them into ngrams.
-void MakeNGramMapFromReferences(const vector<vector<WordID> > &references,
- int n,
- vector<RefCounts> *counts,
- NGramMap *ngrams) {
- ngrams->clear();
- std::pair<vector<WordID>, size_t> insert_me;
- vector<WordID> &ngram = insert_me.first;
- ngram.reserve(n);
- size_t &id = insert_me.second;
- id = 0;
- for (int refi = 0; refi < references.size(); ++refi) {
- const vector<WordID>& ref = references[refi];
- const int s = ref.size();
- for (int j=0; j<s; ++j) {
- const int remaining = s-j;
- const int k = (n < remaining ? n : remaining);
- ngram.clear();
- for (unsigned int i = 0; i < k; ++i) {
- ngram.push_back(ref[j + i]);
- std::pair<NGramMap::iterator, bool> ret(ngrams->insert(insert_me));
- if (ret.second) {
- counts->resize(id + 1);
- RefCounts &ref_counts = counts->back();
- ref_counts.max = 1;
- ref_counts.refs.resize(references.size());
- ref_counts.refs[refi] = 1;
- ref_counts.length = ngram.size();
- ++id;
- } else {
- RefCounts &ref_counts = (*counts)[ret.first->second];
- ref_counts.max = std::max(ref_counts.max, ++ref_counts.refs[refi]);
- }
- }
- }
- }
-}
-
-struct MutableState {
- MutableState(void *from, size_t n) : length(reinterpret_cast<size_t*>(from)), left(reinterpret_cast<WordID *>(length + 1)), right(left + n - 1), counts(reinterpret_cast<GramCount *>(right + n - 1)) {}
- size_t *length;
- WordID *left, *right;
- GramCount *counts;
- static size_t Size(size_t n, size_t bound_ngram_id) { return sizeof(size_t) + (n - 1) * 2 * sizeof(WordID) + bound_ngram_id * sizeof(GramCount); }
-};
-
-struct ConstState {
- ConstState(const void *from, size_t n) : length(reinterpret_cast<const size_t*>(from)), left(reinterpret_cast<const WordID *>(length + 1)), right(left + n - 1), counts(reinterpret_cast<const GramCount *>(right + n - 1)) {}
- const size_t *length;
- const WordID *left, *right;
- const GramCount *counts;
- static size_t Size(size_t n, size_t bound_ngram_id) { return sizeof(size_t) + (n - 1) * 2 * sizeof(WordID) + bound_ngram_id * sizeof(GramCount); }
-};
-
-template <class T> struct CompatibleHashRange : public std::unary_function<const boost::iterator_range<T> &, size_t> {
- size_t operator()(const boost::iterator_range<T> &range) const {
- return boost::hash_range(range.begin(), range.end());
- }
-};
-
-template <class T> struct CompatibleEqualsRange : public std::binary_function<const boost::iterator_range<T> &, const std::vector<WordID> &, size_t> {
- size_t operator()(const boost::iterator_range<T> &range, const std::vector<WordID> &vec) const {
- return boost::algorithm::equals(range, vec);
- }
- size_t operator()(const std::vector<WordID> &vec, const boost::iterator_range<T> &range) const {
- return boost::algorithm::equals(range, vec);
- }
-};
-
-void AddWord(const boost::circular_buffer<WordID> &segment, size_t min_length, const NGramMap &ref_grams, GramCount *counters) {
- typedef boost::circular_buffer<WordID>::const_iterator BufferIt;
- typedef boost::iterator_range<BufferIt> SegmentRange;
- if (segment.size() < min_length) return;
-#if 0
- CompatibleHashRange<BufferIt> hasher;
- CompatibleEqualsRange<BufferIt> equals;
- for (BufferIt seg_start(segment.end() - min_length); ; --seg_start) {
- NGramMap::const_iterator found = ref_grams.find(SegmentRange(seg_start, segment.end()));
- if (found == ref_grams.end()) break;
- ++counters[found->second];
- if (seg_start == segment.begin()) break;
- }
-#endif
-}
-
-} // namespace
-
-class TrombleLossComputerImpl {
- public:
- explicit TrombleLossComputerImpl(const std::string &params) : star_(TD::Convert("<{STAR}>")) {
- typedef boost::tokenizer<boost::char_separator<char> > Tokenizer;
- // Argument parsing
- std::string ref_file_name;
- Tokenizer tok(params, boost::char_separator<char>(" "));
- Tokenizer::iterator i = tok.begin();
- if (i == tok.end()) {
- std::cerr << "TrombleLossComputer needs a reference file name." << std::endl;
- exit(1);
- }
- ref_file_name = *i++;
- if (i == tok.end()) {
- std::cerr << "TrombleLossComputer needs to know how many references." << std::endl;
- exit(1);
- }
- num_refs_ = boost::lexical_cast<unsigned int>(*i++);
- for (; i != tok.end(); ++i) {
- thetas_.push_back(boost::lexical_cast<double>(*i));
- }
- if (thetas_.empty()) {
- std::cerr << "TrombleLossComputer is pointless with no weight on n-grams." << std::endl;
- exit(1);
- }
-
- // Read references file.
- std::ifstream ref_file(ref_file_name.c_str());
- if (!ref_file) {
- std::cerr << "Could not open TrombleLossComputer file " << ref_file_name << std::endl;
- exit(1);
- }
- std::string ref;
- vector<vector<WordID> > references(num_refs_);
- bound_ngram_id_ = 0;
- for (unsigned int sentence = 0; ref_file; ++sentence) {
- for (unsigned int refidx = 0; refidx < num_refs_; ++refidx) {
- if (!getline(ref_file, ref)) {
- if (refidx == 0) break;
- std::cerr << "Short read of " << refidx << " references for sentence " << sentence << std::endl;
- exit(1);
- }
- TD::ConvertSentence(ref, &references[refidx]);
- }
- ref_ids_.resize(sentence + 1);
- ref_counts_.resize(sentence + 1);
- MakeNGramMapFromReferences(references, thetas_.size(), &ref_counts_.back(), &ref_ids_.back());
- bound_ngram_id_ = std::max(bound_ngram_id_, ref_ids_.back().size());
- }
- }
-
- size_t StateSize() const {
- // n-1 boundary words plus counts for n-grams currently rendered as bytes even though most would fit in bits.
- // Also, this is cached by higher up classes so no need to cache here.
- return MutableState::Size(thetas_.size(), bound_ngram_id_);
- }
-
- double Traversal(
- const SentenceMetadata &smeta,
- const TRule &rule,
- const vector<const void*> &ant_contexts,
- void *out_context) const {
- // TODO: get refs from sentence metadata.
- // This will require resizable features.
- if (smeta.GetSentenceID() >= ref_ids_.size()) {
- std::cerr << "Sentence ID " << smeta.GetSentenceID() << " doesn't have references; there are only " << ref_ids_.size() << " references." << std::endl;
- exit(1);
- }
- const NGramMap &ngrams = ref_ids_[smeta.GetSentenceID()];
- MutableState out_state(out_context, thetas_.size());
- memset(out_state.counts, 0, bound_ngram_id_ * sizeof(GramCount));
- boost::circular_buffer<WordID> history(thetas_.size());
- std::vector<const void*>::const_iterator ant_context = ant_contexts.begin();
- *out_state.length = 0;
- size_t pushed = 0;
- const size_t keep = thetas_.size() - 1;
- for (vector<WordID>::const_iterator rhs = rule.e().begin(); rhs != rule.e().end(); ++rhs) {
- if (*rhs < 1) {
- assert(ant_context != ant_contexts.end());
- // Constituent
- ConstState rhs_state(*ant_context, thetas_.size());
- *out_state.length += *rhs_state.length;
- {
- GramCount *accum = out_state.counts;
- for (const GramCount *c = rhs_state.counts; c != rhs_state.counts + ngrams.size(); ++c, ++accum) {
- *accum += *c;
- }
- }
- const WordID *w = rhs_state.left;
- bool long_constit = true;
- for (size_t i = 1; i <= keep; ++i, ++w) {
- if (*w == star_) {
- long_constit = false;
- break;
- }
- history.push_back(*w);
- if (++pushed == keep) {
- std::copy(history.begin(), history.end(), out_state.left);
- }
- // Now i is the length of the history coming from this constituent. So it needs at least i+1 words to have a cross-child add.
- AddWord(history, i + 1, ngrams, out_state.counts);
- }
- // If the consituent is shorter than thetas_.size(), then the
- // constituent's left is the entire constituent, so history is already
- // correct. Otherwise, the entire right hand side is the entire
- // history.
- if (long_constit) {
- history.assign(thetas_.size(), rhs_state.right, rhs_state.right + keep);
- }
- ++ant_context;
- } else {
- // Word
- ++*out_state.length;
- history.push_back(*rhs);
- if (++pushed == keep) {
- std::copy(history.begin(), history.end(), out_state.left);
- }
- AddWord(history, 1, ngrams, out_state.counts);
- }
- }
- // Fill in left and right constituents.
- if (pushed < keep) {
- std::copy(history.begin(), history.end(), out_state.left);
- for (WordID *i = out_state.left + pushed; i != out_state.left + keep; ++i) {
- *i = star_;
- }
- std::copy(out_state.left, out_state.left + keep, out_state.right);
- } else if(pushed == keep) {
- std::copy(history.begin(), history.end(), out_state.right);
- } else if ((pushed > keep) && !history.empty()) {
- std::copy(history.begin() + 1, history.end(), out_state.right);
- }
- std::vector<RefCounts>::const_iterator ref_info = ref_counts_[smeta.GetSentenceID()].begin();
- // Clip the counts and count matches.
- // Indexed by reference then by length.
- std::vector<std::vector<unsigned int> > matches(num_refs_, std::vector<unsigned int>(thetas_.size()));
- for (GramCount *c = out_state.counts; c != out_state.counts + ngrams.size(); ++c, ++ref_info) {
- *c = std::min(*c, ref_info->max);
- if (*c) {
- for (unsigned int refidx = 0; refidx < num_refs_; ++refidx) {
- assert(ref_info->length >= 1);
- assert(ref_info->length - 1 < thetas_.size());
- matches[refidx][ref_info->length - 1] += std::min(*c, ref_info->refs[refidx]);
- }
- }
- }
- double best_score = 0.0;
- for (unsigned int refidx = 0; refidx < num_refs_; ++refidx) {
- double score = 0.0;
- for (unsigned int j = 0; j < std::min(*out_state.length, thetas_.size()); ++j) {
- score += thetas_[j] * static_cast<double>(matches[refidx][j]) / static_cast<double>(*out_state.length - j);
- }
- best_score = std::max(best_score, score);
- }
- return best_score;
- }
-
- private:
- unsigned int num_refs_;
- // Indexed by sentence id.
- std::vector<NGramMap> ref_ids_;
- // Then by id from ref_ids_.
- std::vector<std::vector<RefCounts> > ref_counts_;
-
- // thetas_[0] is the weight for 1-grams
- std::vector<double> thetas_;
-
- // All ngram ids in ref_ids_ are < this value.
- size_t bound_ngram_id_;
-
- const WordID star_;
-};
-
-TrombleLossComputer::TrombleLossComputer(const std::string &params) :
- boost::base_from_member<PImpl>(new TrombleLossComputerImpl(params)),
- FeatureFunction(boost::base_from_member<PImpl>::member->StateSize()),
- fid_(FD::Convert("TrombleLossComputer")) {}
-
-TrombleLossComputer::~TrombleLossComputer() {}
-
-void TrombleLossComputer::TraversalFeaturesImpl(const SentenceMetadata& smeta,
- const Hypergraph::Edge& edge,
- const vector<const void*>& ant_contexts,
- SparseVector<double>* features,
- SparseVector<double>* estimated_features,
- void* out_context) const {
- (void) estimated_features;
- const double loss = boost::base_from_member<PImpl>::member->Traversal(smeta, *edge.rule_, ant_contexts, out_context);
- features->set_value(fid_, loss);
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-25 01:28:36 +0000