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39 lines
975 B
C++
39 lines
975 B
C++
// -*- c++ -*-
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// Phrase scorer that rewards the number of phrase pair occurrences in a bitext
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// with the asymptotic function x/(j+x) where x > 0 is a function
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// parameter that determines the steepness of the rewards curve
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// written by Ulrich Germann
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#include "sapt_pscore_base.h"
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#include <boost/dynamic_bitset.hpp>
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namespace sapt {
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// rareness penalty: x/(n+x)
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template<typename Token>
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class
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PScoreRareness : public SingleRealValuedParameterPhraseScorerFamily<Token>
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{
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public:
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PScoreRareness(std::string const spec)
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{
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this->m_tag = "rare";
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this->init(spec);
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}
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bool
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isLogVal(int i) const { return false; }
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void
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operator()(Bitext<Token> const& bt,
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PhrasePair<Token>& pp,
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std::vector<float> * dest = NULL) const
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{
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if (!dest) dest = &pp.fvals;
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size_t i = this->m_index;
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BOOST_FOREACH(float const x, this->m_x)
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(*dest).at(i++) = x/(x + pp.joint);
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}
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};
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} // namespace sapt
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