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#ifndef _DTRAIN_SCORE_H_
#define _DTRAIN_SCORE_H_
#include <iostream>
#include <vector>
#include <map>
#include <cassert>
#include <cmath>
#include "wordid.h"
using namespace std;
namespace dtrain
{
/*
* NgramCounts
*
*/
struct NgramCounts
{
NgramCounts( const size_t N ) : N_( N ) {
reset();
}
size_t N_;
map<size_t, size_t> clipped;
map<size_t, size_t> sum;
void
operator+=( const NgramCounts& rhs )
{
assert( N_ == rhs.N_ );
for ( size_t i = 0; i < N_; i++ ) {
this->clipped[i] += rhs.clipped.find(i)->second;
this->sum[i] += rhs.sum.find(i)->second;
}
}
const NgramCounts
operator+( const NgramCounts &other ) const
{
NgramCounts result = *this;
result += other;
return result;
}
void
add( size_t count, size_t ref_count, size_t i )
{
assert( i < N_ );
if ( count > ref_count ) {
clipped[i] += ref_count;
sum[i] += count;
} else {
clipped[i] += count;
sum[i] += count;
}
}
void
reset()
{
size_t i;
for ( i = 0; i < N_; i++ ) {
clipped[i] = 0;
sum[i] = 0;
}
}
void
print()
{
for ( size_t i = 0; i < N_; i++ ) {
cout << i+1 << "grams (clipped):\t" << clipped[i] << endl;
cout << i+1 << "grams:\t\t\t" << sum[i] << endl;
}
}
};
typedef map<vector<WordID>, size_t> Ngrams;
Ngrams make_ngrams( vector<WordID>& s, size_t N );
NgramCounts make_ngram_counts( vector<WordID> hyp, vector<WordID> ref, size_t N );
double brevity_penaly( const size_t hyp_len, const size_t ref_len );
double bleu( NgramCounts& counts, const size_t hyp_len, const size_t ref_len, const size_t N,
vector<float> weights = vector<float>() );
double stupid_bleu( NgramCounts& counts, const size_t hyp_len, const size_t ref_len, size_t N,
vector<float> weights = vector<float>() );
double smooth_bleu( NgramCounts& counts, const size_t hyp_len, const size_t ref_len, const size_t N,
vector<float> weights = vector<float>() );
double approx_bleu( NgramCounts& counts, const size_t hyp_len, const size_t ref_len, const size_t N,
vector<float> weights = vector<float>() );
} // namespace
#endif
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