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#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <getopt.h>
#include <math.h>
#include "Scorer.h"
#include "Timer.h"
#include "Util.h"
#include "ScorerFactory.h"
using namespace std;
Scorer* scorer;
int bootstrap = 0;
void evaluate(const string& candFile);
void addStats(vector<int>& stats1, const vector<int>& stats2);
float average(const vector<float>& list);
float stdDeviation(const vector<float>& list, float avg);
string int2string(int n);
void usage()
{
cerr<<"usage: evaluator [options] --reference ref1[,ref2[,ref3...]] --candidate cand1[,cand2[,cand3...]] "<<endl;
cerr<<"[--sctype|-s] the scorer type (default BLEU)"<<endl;
cerr<<"[--scconfig|-c] configuration string passed to scorer"<<endl;
cerr<<"\tThis is of the form NAME1:VAL1,NAME2:VAL2 etc "<<endl;
cerr<<"[--reference|-R] comma separated list of reference files"<<endl;
cerr<<"[--candidate|-C] comma separated list of candidate files"<<endl;
cerr<<"[--bootstrap|-b] number of booststraped samples (default 0 - no bootstraping)"<<endl;
cerr<<"[--rseed|-r] the random seed for bootstraping (defaults to system clock)"<<endl;
cerr<<"[--help|-h] print this message and exit"<<endl;
exit(1);
}
static struct option long_options[] = {
{"sctype",required_argument,0,'s'},
{"scconfig",required_argument,0,'c'},
{"reference",required_argument,0,'R'},
{"candidate",required_argument,0,'C'},
{"bootstrap",required_argument,0,'b'},
{"rseed",required_argument,0,'r'},
{"help",no_argument,0,'h'},
{0, 0, 0, 0}
};
int option_index;
int main(int argc, char** argv)
{
ResetUserTime();
//defaults
string scorerType("BLEU");
string scorerConfig("");
string reference("");
string candidate("");
int seed = 0;
bool hasSeed = false;
int c;
while ((c=getopt_long (argc,argv, "s:c:R:C:b:r:h", long_options, &option_index)) != -1) {
switch(c) {
case 's':
scorerType = string(optarg);
break;
case 'c':
scorerConfig = string(optarg);
break;
case 'R':
reference = string(optarg);
break;
case 'C':
candidate = string(optarg);
break;
case 'b':
bootstrap = atoi(optarg);
break;
case 'r':
seed = strtol(optarg, NULL, 10);
hasSeed = true;
break;
default:
usage();
}
}
if (bootstrap)
{
if (hasSeed) {
cerr << "Seeding random numbers with " << seed << endl;
srandom(seed);
} else {
cerr << "Seeding random numbers with system clock " << endl;
srandom(time(NULL));
}
}
try {
vector<string> refFiles;
vector<string> candFiles;
if (reference.length() == 0) throw runtime_error("You have to specify at least one reference file.");
split(reference,',',refFiles);
if (candidate.length() == 0) throw runtime_error("You have to specify at least one candidate file.");
split(candidate,',',candFiles);
scorer = ScorerFactory::getScorer(scorerType,scorerConfig);
cerr << "Using scorer: " << scorer->getName() << endl;
scorer->setReferenceFiles(refFiles);
PrintUserTime("Reference files loaded");
for (vector<string>::const_iterator it = candFiles.begin(); it != candFiles.end(); ++it)
{
evaluate(*it);
}
PrintUserTime("Evaluation done");
delete scorer;
return EXIT_SUCCESS;
} catch (const exception& e) {
cerr << "Exception: " << e.what() << endl;
return EXIT_FAILURE;
}
}
void evaluate(const string& candFile)
{
ifstream cand(candFile.c_str());
if (!cand.good()) throw runtime_error("Error opening candidate file");
vector<ScoreStats> entries;
// Loading sentences and preparing statistics
ScoreStats scoreentry;
string line;
while (getline(cand, line))
{
scorer->prepareStats(entries.size(), line, scoreentry);
entries.push_back(scoreentry);
}
PrintUserTime("Candidate file " + candFile + " loaded and stats prepared");
int n = entries.size();
if (bootstrap)
{
vector<float> scores;
for (int i = 0; i < bootstrap; ++i)
{
// TODO: Use smart pointer for exceptional-safety.
ScoreData* scoredata = new ScoreData(*scorer);
for (int j = 0; j < n; ++j)
{
int randomIndex = random() % n;
string str_j = int2string(j);
scoredata->add(entries[randomIndex], str_j);
}
scorer->setScoreData(scoredata);
candidates_t candidates(n, 0);
float score = scorer->score(candidates);
scores.push_back(score);
delete scoredata;
}
float avg = average(scores);
float dev = stdDeviation(scores, avg);
cout.setf(ios::fixed,ios::floatfield);
cout.precision(4);
cout << "File: " << candFile << "\t" << scorer->getName() << " Average score: " << avg << "\tStandard deviation: " << dev << endl;
}
else
{
// TODO: Use smart pointer for exceptional-safety.
ScoreData* scoredata = new ScoreData(*scorer);
for (int sid = 0; sid < n; ++sid)
{
string str_sid = int2string(sid);
scoredata->add(entries[sid], str_sid);
}
scorer->setScoreData(scoredata);
candidates_t candidates(n, 0);
float score = scorer->score(candidates);
delete scoredata;
cout.setf(ios::fixed,ios::floatfield);
cout.precision(4);
cout << "File: " << candFile << "\t" << scorer->getName() << " Score: " << score << endl;
}
}
string int2string(int n)
{
stringstream ss;
ss << n;
return ss.str();
}
float average(const vector<float>& list)
{
float sum = 0;
for (vector<float>::const_iterator it = list.begin(); it != list.end(); ++it)
sum += *it;
return sum / list.size();
}
float stdDeviation(const vector<float>& list, float avg)
{
vector<float> tmp;
for (vector<float>::const_iterator it = list.begin(); it != list.end(); ++it)
tmp.push_back(pow(*it - avg, 2));
return sqrt(average(tmp));
}
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