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/*
* NBest.cpp
*
* Created on: 24 Aug 2016
* Author: hieu
*/
#include <sstream>
#include <boost/foreach.hpp>
#include "util/exception.hh"
#include "NBest.h"
#include "NBests.h"
#include "NBestColl.h"
#include "../Manager.h"
#include "../TargetPhraseImpl.h"
#include "../../System.h"
using namespace std;
namespace Moses2
{
namespace SCFG
{
NBest::NBest(
const SCFG::Manager &mgr,
const ArcList &varcList,
size_t vind,
NBestColl &nbestColl)
:arcList(&varcList)
,arcInd(vind)
{
const SCFG::Hypothesis &hypo = GetHypo();
// copy scores from best hypo
MemPool &pool = mgr.GetPool();
m_scores = new (pool.Allocate<Scores>())
Scores(mgr.system, pool, mgr.system.featureFunctions.GetNumScores(), hypo.GetScores());
// children
const ArcLists &arcLists = mgr.arcLists;
//const SCFG::TargetPhraseImpl &tp = hypo.GetTargetPhrase();
const Vector<const Hypothesis*> &prevHypos = hypo.GetPrevHypos();
for (size_t i = 0; i < prevHypos.size(); ++i) {
const SCFG::Hypothesis *prevHypo = prevHypos[i];
const ArcList &childArc = arcLists.GetArcList(prevHypo);
NBests &childNBests = nbestColl.GetOrCreateNBests(mgr, childArc);
Child child(&childNBests, 0);
children.push_back(child);
}
stringstream strm;
OutputToStream(mgr, strm, nbestColl);
m_str = strm.str();
}
NBest::NBest(const SCFG::Manager &mgr,
const NBest &orig,
size_t childInd,
NBestColl &nbestColl)
:arcList(orig.arcList)
,arcInd(orig.arcInd)
,children(orig.children)
{
Child &child = children[childInd];
size_t &ind = child.second;
++ind;
UTIL_THROW_IF2(ind >= child.first->GetSize(),
"out of bound:" << ind << ">=" << child.first->GetSize());
// scores
MemPool &pool = mgr.GetPool();
m_scores = new (pool.Allocate<Scores>())
Scores(mgr.system,
pool,
mgr.system.featureFunctions.GetNumScores(),
orig.GetScores());
const Scores &origScores = orig.GetChild(childInd).GetScores();
const Scores &newScores = GetChild(childInd).GetScores();
m_scores->MinusEquals(mgr.system, origScores);
m_scores->PlusEquals(mgr.system, newScores);
stringstream strm;
OutputToStream(mgr, strm, nbestColl);
m_str = strm.str();
}
const SCFG::Hypothesis &NBest::GetHypo() const
{
const HypothesisBase *hypoBase = (*arcList)[arcInd];
const SCFG::Hypothesis &hypo = *static_cast<const SCFG::Hypothesis*>(hypoBase);
return hypo;
}
const NBest &NBest::GetChild(size_t ind) const
{
const Child &child = children[ind];
const NBests &nbests = *child.first;
const NBest &nbest = nbests.Get(child.second);
return nbest;
}
void NBest::CreateDeviants(
const SCFG::Manager &mgr,
NBestColl &nbestColl,
Contenders &contenders) const
{
if (arcInd + 1 < arcList->size()) {
// to use next arclist, all children must be 1st. Not sure if this is correct
bool ok = true;
BOOST_FOREACH(const Child &child, children) {
if (child.second) {
ok = false;
break;
}
}
if (ok) {
NBest *next = new NBest(mgr, *arcList, arcInd + 1, nbestColl);
contenders.push(next);
}
}
for (size_t childInd = 0; childInd < children.size(); ++childInd) {
const Child &child = children[childInd];
NBests &childNBests = *child.first;
bool extended = childNBests.Extend(mgr, nbestColl, child.second + 1);
if (extended) {
//cerr << "HH1 " << childInd << endl;
NBest *next = new NBest(mgr, *this, childInd, nbestColl);
//cerr << "HH2 " << childInd << endl;
contenders.push(next);
//cerr << "HH3 " << childInd << endl;
}
}
}
void NBest::OutputToStream(
const SCFG::Manager &mgr,
std::stringstream &strm,
const NBestColl &nbestColl) const
{
const SCFG::Hypothesis &hypo = GetHypo();
//strm << &hypo << " ";
const SCFG::TargetPhraseImpl &tp = hypo.GetTargetPhrase();
for (size_t targetPos = 0; targetPos < tp.GetSize(); ++targetPos) {
const SCFG::Word &word = tp[targetPos];
//cerr << "word " << pos << "=" << word << endl;
if (word.isNonTerminal) {
//cerr << "is nt" << endl;
// non-term. fill out with prev hypo
size_t nonTermInd = tp.GetAlignNonTerm().GetNonTermIndexMap()[targetPos];
UTIL_THROW_IF2(nonTermInd >= children.size(), "Out of bounds:" << nonTermInd << ">=" << children.size());
const NBest &nbest = GetChild(nonTermInd);
strm << nbest.GetString();
}
else {
//cerr << "not nt" << endl;
word.OutputToStream(hypo.GetManager(), targetPos, hypo, strm);
strm << " ";
}
}
}
std::string NBest::Debug(const System &system) const
{
stringstream strm;
strm << GetScores().GetTotalScore() << " "
<< arcList << "("
<< arcList->size() << ")["
<< arcInd << "] ";
for (size_t i = 0; i < children.size(); ++i) {
const Child &child = children[i];
const NBest &childNBest = child.first->Get(child.second);
strm << child.first << "("
<< child.first->GetSize() << ")["
<< child.second << "]";
strm << childNBest.GetScores().GetTotalScore() << " ";
}
return strm.str();
}
}
}
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