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