mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-10-27 11:59:52 +03:00
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
//-*- c++ -*-
|
|
// written by Ulrich Germann
|
|
#pragma once
|
|
#include "moses/TranslationModel/UG/mm/ug_bitext.h"
|
|
#include "util/exception.hh"
|
|
#include "boost/format.hpp"
|
|
#include "boost/foreach.hpp"
|
|
|
|
namespace Moses {
|
|
namespace bitext
|
|
{
|
|
template<typename Token>
|
|
class
|
|
PScorePbwd : public PhraseScorer<Token>
|
|
{
|
|
float conf;
|
|
string denom;
|
|
|
|
public:
|
|
PScorePbwd(float const c, string d)
|
|
{
|
|
this->m_index = -1;
|
|
conf = c;
|
|
denom = d;
|
|
size_t checksum = d.size();
|
|
BOOST_FOREACH(char const& x, denom)
|
|
{
|
|
if (x == '+') { --checksum; continue; }
|
|
if (x != 'g' && x != 's' && x != 'r') continue;
|
|
string s = (format("pbwd-%c%.3f") % x % c).str();
|
|
this->m_feature_names.push_back(s);
|
|
}
|
|
this->m_num_feats = this->m_feature_names.size();
|
|
UTIL_THROW_IF2(this->m_feature_names.size() != checksum,
|
|
"Unknown parameter in specification '"
|
|
<< d << "' for Pbwd phrase scorer at " << HERE);
|
|
}
|
|
|
|
void
|
|
operator()(Bitext<Token> const& bt,
|
|
PhrasePair<Token>& pp,
|
|
vector<float> * dest = NULL) const
|
|
{
|
|
if (!dest) dest = &pp.fvals;
|
|
// we use the denominator specification to scale the raw counts on the
|
|
// target side; the clean way would be to counter-sample
|
|
size_t i = this->m_index;
|
|
BOOST_FOREACH(char const& x, denom)
|
|
{
|
|
uint32_t m2 = pp.raw2;
|
|
if (x == 'g') m2 = round(m2 * float(pp.good1) / pp.raw1);
|
|
else if (x == 's') m2 = round(m2 * float(pp.sample1) / pp.raw1);
|
|
(*dest)[i++] = log(lbop(max(m2, pp.joint),pp.joint,conf));
|
|
}
|
|
}
|
|
};
|
|
} // namespace bitext
|
|
} // namespace Moses
|