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#ifndef _DTRAIN_LEARNER_H_
#define _DTRAIN_LEARNER_H_
#include <string>
#include <vector>
#include <map>
#include "sparse_vector.h"
#include "score.h"
namespace dtrain
{
class Learner
{
public:
virtual void Init( const vector<SparseVector<double> >& kbest, const Scores& scores,
const bool invert_score = false ) {};
virtual void Update( SparseVector<double>& lambdas ) {};
};
class SofiaLearner : public Learner
{
public:
void
Init( const size_t sid, const vector<SparseVector<double> >& kbest, /*const FIXME*/ Scores& scores,
const bool invert_score = false )
{
assert( kbest.size() == scores.size() );
ofstream o;
unlink( "/tmp/sofia_ml_training" );
o.open( "/tmp/sofia_ml_training", ios::trunc ); // TODO randomize, filename exists
int fid = 0;
map<int,int>::iterator ff;
double score;
for ( size_t k = 0; k < kbest.size(); ++k ) {
map<int,double> m;
SparseVector<double>::const_iterator it = kbest[k].begin();
score = scores[k].GetScore();
if ( invert_score ) score = -score;
o << score;
for ( ; it != kbest[k].end(); ++it ) {
ff = fmap.find( it->first );
if ( ff == fmap.end() ) {
fmap.insert( pair<int,int>(it->first, fid) );
fmap1.insert( pair<int,int>(fid, it->first) );
fid++;
}
m.insert( pair<int,double>(fmap[it->first], it->second) );
}
map<int,double>::iterator ti = m.begin();
for ( ; ti != m.end(); ++ti ) {
o << " " << ti->first << ":" << ti->second;
}
o << endl;
}
o.close();
}
void
Update(SparseVector<double>& lambdas)
{
string call = "./sofia-ml --training_file /tmp/sofia_ml_training --model_out /tmp/sofia_ml_model --loop_type stochastic --lambda 100 --dimensionality ";
std::stringstream out;
out << fmap.size();
call += out.str();
call += " &>/dev/null";
system ( call.c_str() );
ifstream i;
unlink( "/tmp/sofia_ml_model" );
i.open( "/tmp/sofia_ml_model", ios::in );
string model;
getline( i, model );
vector<string> strs;
boost::split( strs, model, boost::is_any_of(" ") );
int j = 0;
for ( vector<string>::iterator it = strs.begin(); it != strs.end(); ++it ) {
lambdas.set_value(fmap1[j], atof( it->c_str() ) );
j++;
}
}
private:
map<int,int> fmap;
map<int,int> fmap1;
};
} // namespace
#endif
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