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
80
81
82
83
84
85
86
87
88
|
#include <boost/shared_ptr.hpp>
#include "SpanLength.h"
#include "moses/StaticData.h"
#include "moses/Word.h"
#include "moses/ChartCellLabel.h"
#include "moses/Range.h"
#include "moses/StackVec.h"
#include "moses/TargetPhrase.h"
#include "moses/PP/PhraseProperty.h"
#include "moses/PP/SpanLengthPhraseProperty.h"
using namespace std;
namespace Moses
{
SpanLength::SpanLength(const std::string &line)
:StatelessFeatureFunction(1, line)
,m_smoothingMethod(None)
,m_const(0)
{
ReadParameters();
}
void SpanLength::EvaluateInIsolation(const Phrase &source
, const TargetPhrase &targetPhrase
, ScoreComponentCollection &scoreBreakdown
, ScoreComponentCollection &estimatedScores) const
{
targetPhrase.SetRuleSource(source);
}
void SpanLength::EvaluateWithSourceContext(const InputType &input
, const InputPath &inputPath
, const TargetPhrase &targetPhrase
, const StackVec *stackVec
, ScoreComponentCollection &scoreBreakdown
, ScoreComponentCollection *estimatedScores) const
{
assert(stackVec);
const PhraseProperty *property = targetPhrase.GetProperty("SpanLength");
if (property == NULL) {
return;
}
const SpanLengthPhraseProperty *slProp = static_cast<const SpanLengthPhraseProperty*>(property);
assert(targetPhrase.GetRuleSource());
float score = 0;
for (size_t i = 0; i < stackVec->size(); ++i) {
const ChartCellLabel &cell = *stackVec->at(i);
const Range &ntRange = cell.GetCoverage();
size_t sourceWidth = ntRange.GetNumWordsCovered();
float prob = slProp->GetProb(i, sourceWidth, m_const);
score += TransformScore(prob);
}
if (score < -100.0f) {
float weight = StaticData::Instance().GetWeight(this);
if (weight < 0) {
score = -100;
}
}
scoreBreakdown.PlusEquals(this, score);
}
void SpanLength::SetParameter(const std::string& key, const std::string& value)
{
if (key == "smoothing") {
if (value == "plus-constant") {
m_smoothingMethod = PlusConst;
} else if (value == "none") {
m_smoothingMethod = None;
} else {
UTIL_THROW(util::Exception, "Unknown smoothing type " << value);
}
} else if (key == "constant") {
m_const = Scan<float>(value);
} else {
StatelessFeatureFunction::SetParameter(key, value);
}
}
}
|
