mirror of
https://github.com/moses-smt/mosesdecoder.git
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91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
#ifndef LM_READ_ARPA__
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#define LM_READ_ARPA__
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#include "lm/lm_exception.hh"
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#include "lm/word_index.hh"
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#include "lm/weights.hh"
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#include "util/file_piece.hh"
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#include <cstddef>
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#include <iosfwd>
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#include <vector>
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namespace lm {
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void ReadARPACounts(util::FilePiece &in, std::vector<uint64_t> &number);
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void ReadNGramHeader(util::FilePiece &in, unsigned int length);
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void ReadBackoff(util::FilePiece &in, Prob &weights);
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void ReadBackoff(util::FilePiece &in, float &backoff);
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inline void ReadBackoff(util::FilePiece &in, ProbBackoff &weights) {
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ReadBackoff(in, weights.backoff);
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}
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inline void ReadBackoff(util::FilePiece &in, RestWeights &weights) {
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ReadBackoff(in, weights.backoff);
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}
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void ReadEnd(util::FilePiece &in);
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extern const bool kARPASpaces[256];
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// Positive log probability warning.
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class PositiveProbWarn {
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public:
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PositiveProbWarn() : action_(THROW_UP) {}
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explicit PositiveProbWarn(WarningAction action) : action_(action) {}
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void Warn(float prob);
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private:
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WarningAction action_;
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};
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template <class Voc, class Weights> void Read1Gram(util::FilePiece &f, Voc &vocab, Weights *unigrams, PositiveProbWarn &warn) {
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try {
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float prob = f.ReadFloat();
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if (prob > 0.0) {
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warn.Warn(prob);
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prob = 0.0;
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}
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if (f.get() != '\t') UTIL_THROW(FormatLoadException, "Expected tab after probability");
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Weights &value = unigrams[vocab.Insert(f.ReadDelimited(kARPASpaces))];
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value.prob = prob;
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ReadBackoff(f, value);
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} catch(util::Exception &e) {
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e << " in the 1-gram at byte " << f.Offset();
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throw;
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}
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}
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// Return true if a positive log probability came out.
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template <class Voc, class Weights> void Read1Grams(util::FilePiece &f, std::size_t count, Voc &vocab, Weights *unigrams, PositiveProbWarn &warn) {
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ReadNGramHeader(f, 1);
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for (std::size_t i = 0; i < count; ++i) {
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Read1Gram(f, vocab, unigrams, warn);
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}
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vocab.FinishedLoading(unigrams);
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}
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// Return true if a positive log probability came out.
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template <class Voc, class Weights> void ReadNGram(util::FilePiece &f, const unsigned char n, const Voc &vocab, WordIndex *const reverse_indices, Weights &weights, PositiveProbWarn &warn) {
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try {
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weights.prob = f.ReadFloat();
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if (weights.prob > 0.0) {
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warn.Warn(weights.prob);
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weights.prob = 0.0;
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}
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for (WordIndex *vocab_out = reverse_indices + n - 1; vocab_out >= reverse_indices; --vocab_out) {
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*vocab_out = vocab.Index(f.ReadDelimited(kARPASpaces));
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}
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ReadBackoff(f, weights);
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} catch(util::Exception &e) {
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e << " in the " << static_cast<unsigned int>(n) << "-gram at byte " << f.Offset();
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throw;
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}
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}
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} // namespace lm
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#endif // LM_READ_ARPA__
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