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//-*- 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 sapt
{
template<typename Token>
class
PScorePbwd : public PhraseScorer<Token>
{
float conf;
std::string denom;
public:
virtual ~PScorePbwd(){};
PScorePbwd(float const c, std::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' && x != 'b') continue;
std::string s = (boost::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,
std::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' || x == 'b') m2 = round(m2 * float(pp.good1) / pp.raw1);
else if (x == 's') m2 = round(m2 * float(pp.sample1) / pp.raw1);
(*dest)[i] = log(lbop(std::max(m2, pp.joint), pp.joint,conf));
if (x == 'b') (*dest)[i] += log(pp.cum_bias) - log(pp.joint);
++i;
}
}
};
} // namespace sapt
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