File size: 2,500 Bytes
158b61b |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 |
#include "HReorderingForwardState.h"
namespace Moses
{
///////////////////////////
//HReorderingForwardState
HReorderingForwardState::
HReorderingForwardState(const LRModel &config,
size_t size, size_t offset)
: LRState(config, LRModel::Forward, offset)
, m_first(true)
, m_prevRange(NOT_FOUND,NOT_FOUND)
, m_coverage(size)
{ }
HReorderingForwardState::
HReorderingForwardState(const HReorderingForwardState *prev,
const TranslationOption &topt)
: LRState(prev, topt)
, m_first(false)
, m_prevRange(topt.GetSourceWordsRange())
, m_coverage(prev->m_coverage, topt.GetSourceWordsRange())
{
}
size_t HReorderingForwardState::hash() const
{
size_t ret;
ret = hash_value(m_prevRange);
return ret;
}
bool HReorderingForwardState::operator==(const FFState& o) const
{
if (&o == this) return true;
HReorderingForwardState const& other
= static_cast<HReorderingForwardState const&>(o);
int compareScores = ((m_prevRange == other.m_prevRange)
? ComparePrevScores(other.m_prevOption)
: (m_prevRange < other.m_prevRange) ? -1 : 1);
return compareScores == 0;
}
// For compatibility with the phrase-based reordering model, scoring is one
// step delayed.
// The forward model takes determines orientations heuristically as follows:
// mono: if the next phrase comes after the conditioning phrase and
// - there is a gap to the right of the conditioning phrase, or
// - the next phrase immediately follows it
// swap: if the next phrase goes before the conditioning phrase and
// - there is a gap to the left of the conditioning phrase, or
// - the next phrase immediately precedes it
// dright: if the next phrase follows the conditioning phrase and other
// stuff comes in between
// dleft: if the next phrase precedes the conditioning phrase and other
// stuff comes in between
LRState*
HReorderingForwardState::
Expand(TranslationOption const& topt, InputType const& input,
ScoreComponentCollection* scores) const
{
const Range cur = topt.GetSourceWordsRange();
// keep track of the current coverage ourselves so we don't need the hypothesis
Bitmap cov(m_coverage, cur);
if (!m_first) {
LRModel::ReorderingType reoType;
reoType = m_configuration.GetOrientation(m_prevRange,cur,cov);
CopyScores(scores, topt, input, reoType);
}
return new HReorderingForwardState(this, topt);
}
}
|