mirror of
https://github.com/moses-smt/mosesdecoder.git
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98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
#ifndef LM_VALUE_BUILD_H
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#define LM_VALUE_BUILD_H
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#include "lm/weights.hh"
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#include "lm/word_index.hh"
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#include "util/bit_packing.hh"
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#include <vector>
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namespace lm {
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namespace ngram {
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struct Config;
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struct BackoffValue;
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struct RestValue;
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class NoRestBuild {
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public:
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typedef BackoffValue Value;
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NoRestBuild() {}
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void SetRest(const WordIndex *, unsigned int, const Prob &/*prob*/) const {}
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void SetRest(const WordIndex *, unsigned int, const ProbBackoff &) const {}
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template <class Second> bool MarkExtends(ProbBackoff &weights, const Second &) const {
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util::UnsetSign(weights.prob);
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return false;
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}
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// Probing doesn't need to go back to unigram.
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const static bool kMarkEvenLower = false;
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};
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class MaxRestBuild {
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public:
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typedef RestValue Value;
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MaxRestBuild() {}
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void SetRest(const WordIndex *, unsigned int, const Prob &/*prob*/) const {}
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void SetRest(const WordIndex *, unsigned int, RestWeights &weights) const {
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weights.rest = weights.prob;
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util::SetSign(weights.rest);
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}
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bool MarkExtends(RestWeights &weights, const RestWeights &to) const {
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util::UnsetSign(weights.prob);
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if (weights.rest >= to.rest) return false;
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weights.rest = to.rest;
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return true;
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}
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bool MarkExtends(RestWeights &weights, const Prob &to) const {
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util::UnsetSign(weights.prob);
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if (weights.rest >= to.prob) return false;
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weights.rest = to.prob;
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return true;
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}
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// Probing does need to go back to unigram.
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const static bool kMarkEvenLower = true;
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};
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template <class Model> class LowerRestBuild {
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public:
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typedef RestValue Value;
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LowerRestBuild(const Config &config, unsigned int order, const typename Model::Vocabulary &vocab);
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~LowerRestBuild();
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void SetRest(const WordIndex *, unsigned int, const Prob &/*prob*/) const {}
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void SetRest(const WordIndex *vocab_ids, unsigned int n, RestWeights &weights) const {
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typename Model::State ignored;
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if (n == 1) {
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weights.rest = unigrams_[*vocab_ids];
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} else {
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weights.rest = models_[n-2]->FullScoreForgotState(vocab_ids + 1, vocab_ids + n, *vocab_ids, ignored).prob;
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}
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}
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template <class Second> bool MarkExtends(RestWeights &weights, const Second &) const {
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util::UnsetSign(weights.prob);
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return false;
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}
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const static bool kMarkEvenLower = false;
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std::vector<float> unigrams_;
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std::vector<const Model*> models_;
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};
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} // namespace ngram
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} // namespace lm
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#endif // LM_VALUE_BUILD_H
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