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// $Id$
/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#ifndef moses_LanguageModelReloading_h
#define moses_LanguageModelReloading_h
#include <string>
#include "moses/LM/Base.h"
#include "moses/LM/Ken.h"
#include "util/tokenize_piece.hh"
#include "util/string_stream.hh"
#include <iostream>
namespace Moses
{
class FFState;
template <class Model> class ReloadingLanguageModel : public LanguageModelKen<Model>
{
public:
ReloadingLanguageModel(const std::string &line, const std::string &file, FactorType factorType, bool lazy) : LanguageModelKen<Model>(line, file, factorType, lazy ? util::LAZY : util::POPULATE_OR_READ), m_file(file), m_lazy(lazy) {
VERBOSE(1, "ReloadingLM constructor: " << m_file << std::endl);
}
virtual void InitializeForInput(ttasksptr const& ttask) {
VERBOSE(1, "ReloadingLM InitializeForInput" << std::endl);
// The context scope object for this translation task
// contains a map of translation task-specific data
boost::shared_ptr<Moses::ContextScope> contextScope = ttask->GetScope();
// The key to the map is this object
void const* key = static_cast<void const*>(this);
// The value stored in the map is a string representing a phrase table
boost::shared_ptr<string> value = contextScope->get<string>(key);
// Create a stream to read the phrase table data
stringstream strme(*(value.get()));
ofstream tmp;
tmp.open(m_file.c_str());
// Read the phrase table data, one line at a time
string line;
while (getline(strme, line)) {
tmp << line << "\n";
}
tmp.close();
LanguageModelKen<Model>::LoadModel(m_file, m_lazy ? util::LAZY : util::POPULATE_OR_READ);
};
protected:
using LanguageModelKen<Model>::m_ngram;
using LanguageModelKen<Model>::m_lmIdLookup;
using LanguageModelKen<Model>::m_beginSentenceFactor;
const std::string m_file;
bool m_lazy;
};
LanguageModel *ConstructReloadingLM(const std::string &line, const std::string &file, FactorType factorType, bool lazy)
{
lm::ngram::ModelType model_type;
if (lm::ngram::RecognizeBinary(file.c_str(), model_type)) {
switch(model_type) {
case lm::ngram::PROBING:
return new ReloadingLanguageModel<lm::ngram::ProbingModel>(line, file, factorType, lazy);
case lm::ngram::REST_PROBING:
return new ReloadingLanguageModel<lm::ngram::RestProbingModel>(line, file, factorType, lazy);
case lm::ngram::TRIE:
return new ReloadingLanguageModel<lm::ngram::TrieModel>(line, file, factorType, lazy);
case lm::ngram::QUANT_TRIE:
return new ReloadingLanguageModel<lm::ngram::QuantTrieModel>(line, file, factorType, lazy);
case lm::ngram::ARRAY_TRIE:
return new ReloadingLanguageModel<lm::ngram::ArrayTrieModel>(line, file, factorType, lazy);
case lm::ngram::QUANT_ARRAY_TRIE:
return new ReloadingLanguageModel<lm::ngram::QuantArrayTrieModel>(line, file, factorType, lazy);
default:
UTIL_THROW2("Unrecognized kenlm model type " << model_type);
}
} else {
return new ReloadingLanguageModel<lm::ngram::ProbingModel>(line, file, factorType, lazy);
}
}
LanguageModel *ConstructReloadingLM(const std::string &lineOrig)
{
FactorType factorType = 0;
std::string filePath;
bool lazy = false;
util::TokenIter<util::SingleCharacter, true> argument(lineOrig, ' ');
++argument; // KENLM
util::StringStream line;
line << "KENLM";
for (; argument; ++argument) {
const char *equals = std::find(argument->data(), argument->data() + argument->size(), '=');
UTIL_THROW_IF2(equals == argument->data() + argument->size(),
"Expected = in ReloadingLM argument " << *argument);
StringPiece name(argument->data(), equals - argument->data());
StringPiece value(equals + 1, argument->data() + argument->size() - equals - 1);
if (name == "factor") {
factorType = boost::lexical_cast<FactorType>(value);
} else if (name == "order") {
// Ignored
} else if (name == "path") {
filePath.assign(value.data(), value.size());
} else if (name == "lazyken") {
lazy = boost::lexical_cast<bool>(value);
} else {
// pass to base class to interpret
line << " " << name << "=" << value;
}
}
return ConstructReloadingLM(line.str(), filePath, factorType, lazy);
}
} // namespace Moses
#endif
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