mosesdecoder/moses-cmd/src/LatticeMBRGrid.cpp

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// $Id: LatticeMBRGrid.cpp 3045 2010-04-05 13:07:29Z hieuhoang1972 $

/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (c) 2010 University of Edinburgh
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#include <cstdlib>
#include <iostream>
#include <map>
#include <stdexcept>
#include <set>

#include "IOWrapper.h"
#include "LatticeMBR.h"
#include "Manager.h"
#include "StaticData.h"


using namespace std;
using namespace Moses;

//keys
enum gridkey {lmbr_p,lmbr_r,lmbr_prune,lmbr_scale};

class Grid
{
public:
  void addParam(gridkey key, const string& arg, float defaultValue) {
    m_args[arg] = key;
    CHECK(m_grid.find(key) == m_grid.end());
    m_grid[key].push_back(defaultValue);
  }

  void parseArgs(int& argc, char**& argv) {
    char** newargv = new char*[argc+1]; //Space to add mbr parameter
    int newargc = 0;
    for (int i = 0; i < argc; ++i) {
      bool consumed = false;
      for (map<string,gridkey>::const_iterator argi = m_args.begin(); argi != m_args.end(); ++argi) {
        if (!strcmp(argv[i], argi->first.c_str())) {
          ++i;
          if (i >= argc) {
            cerr << "Error: missing parameter for " << argi->first << endl;
            throw runtime_error("Missing parameter");
          } else {
            string value = argv[i];
            gridkey key = argi->second;
            if (m_grid[key].size() != 1) {
              throw runtime_error("Duplicate grid argument");
            }
            m_grid[key].clear();
            char delim = ',';
            string::size_type lastpos = value.find_first_not_of(delim);
            string::size_type pos = value.find_first_of(delim,lastpos);
            while (string::npos != pos || string::npos != lastpos) {
              float param = atof(value.substr(lastpos, pos-lastpos).c_str());
              if (!param) {
                cerr << "Error: Illegal grid parameter for " << argi->first << endl;
                throw runtime_error("Illegal grid parameter");
              }
              m_grid[key].push_back(param);
              lastpos = value.find_first_not_of(delim,pos);
              pos = value.find_first_of(delim,lastpos);
            }
            consumed = true;
          }
          if (consumed) break;
        }
      }
      if (!consumed) {
        newargv[newargc] = new char[strlen(argv[i]) + 1];
        strcpy(newargv[newargc],argv[i]);
        ++newargc;
      }
    }
    argc = newargc;
    argv = newargv;
  }

  const vector<float>& getGrid(gridkey key) const {
    map<gridkey,vector<float> >::const_iterator iter = m_grid.find(key);
    assert (iter != m_grid.end());
    return iter->second;

  }

private:
  map<gridkey,vector<float> > m_grid;
  map<string,gridkey> m_args;
};

int main(int argc, char* argv[])
{
  cerr << "Lattice MBR Grid search" << endl;

  Grid grid;
  grid.addParam(lmbr_p, "-lmbr-p", 0.5);
  grid.addParam(lmbr_r, "-lmbr-r", 0.5);
  grid.addParam(lmbr_prune, "-lmbr-pruning-factor",30.0);
  grid.addParam(lmbr_scale, "-mbr-scale",1.0);

  grid.parseArgs(argc,argv);

  Parameter* params = new Parameter();
  if (!params->LoadParam(argc,argv)) {
    params->Explain();
    exit(1);
  }
  if (!StaticData::LoadDataStatic(params)) {
    exit(1);
  }

  StaticData& staticData = const_cast<StaticData&>(StaticData::Instance());
  staticData.SetUseLatticeMBR(true);
  IOWrapper* ioWrapper = GetIODevice(staticData);

  if (!ioWrapper) {
    throw runtime_error("Failed to initialise IOWrapper");
  }
  size_t nBestSize = staticData.GetMBRSize();

  if (nBestSize <= 0) {
    throw new runtime_error("Non-positive size specified for n-best list");
  }

  size_t lineCount = 0;
  InputType* source = NULL;

  const vector<float>& pgrid = grid.getGrid(lmbr_p);
  const vector<float>& rgrid = grid.getGrid(lmbr_r);
  const vector<float>& prune_grid = grid.getGrid(lmbr_prune);
  const vector<float>& scale_grid = grid.getGrid(lmbr_scale);

  while(ReadInput(*ioWrapper,staticData.GetInputType(),source)) {
    ++lineCount;
    Sentence sentence;
    const TranslationSystem& system = staticData.GetTranslationSystem(TranslationSystem::DEFAULT);
    Manager manager(*source,staticData.GetSearchAlgorithm(), &system);
    manager.ProcessSentence();
    TrellisPathList nBestList;
    manager.CalcNBest(nBestSize, nBestList,true);
    //grid search
    for (vector<float>::const_iterator pi = pgrid.begin(); pi != pgrid.end(); ++pi) {
      float p = *pi;
      staticData.SetLatticeMBRPrecision(p);
      for (vector<float>::const_iterator ri = rgrid.begin(); ri != rgrid.end(); ++ri) {
        float r = *ri;
        staticData.SetLatticeMBRPRatio(r);
        for (vector<float>::const_iterator prune_i = prune_grid.begin(); prune_i != prune_grid.end(); ++prune_i) {
          size_t prune = (size_t)(*prune_i);
          staticData.SetLatticeMBRPruningFactor(prune);
          for (vector<float>::const_iterator scale_i = scale_grid.begin(); scale_i != scale_grid.end(); ++scale_i) {
            float scale = *scale_i;
            staticData.SetMBRScale(scale);
            cout << lineCount << " ||| " << p << " " << r << " " << prune << " " << scale << " ||| ";
            vector<Word> mbrBestHypo = doLatticeMBR(manager,nBestList);
            OutputBestHypo(mbrBestHypo, lineCount, staticData.GetReportSegmentation(),
                           staticData.GetReportAllFactors(),cout);
          }
        }

      }
    }


  }

}

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