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
89
90
91
92
93
94
95
96
|
// -*- mode: c++; indent-tabs-mode: nil; tab-width:2 -*-
#pragma once
#include "FeatureFunction.h"
namespace Moses
{
class FFState;
namespace Syntax
{
struct SHyperedge;
}
/** base class for all stateful feature functions.
* eg. LM, distortion penalty
*/
class StatefulFeatureFunction: public FeatureFunction
{
//All statefull FFs
static std::vector<const StatefulFeatureFunction*> m_statefulFFs;
public:
static const std::vector<const StatefulFeatureFunction*>&
GetStatefulFeatureFunctions() {
return m_statefulFFs;
}
StatefulFeatureFunction(const std::string &line, bool registerNow);
StatefulFeatureFunction(size_t numScoreComponents, const std::string &line);
/**
* \brief This interface should be implemented.
* Notes: When evaluating the value of this feature function, you should avoid
* calling hypo.GetPrevHypo(). If you need something from the "previous"
* hypothesis, you should store it in an FFState object which will be passed
* in as prev_state. If you don't do this, you will get in trouble.
*/
virtual FFState* EvaluateWhenApplied(
const Hypothesis& cur_hypo,
const FFState* prev_state,
ScoreComponentCollection* accumulator) const = 0;
// virtual FFState* EvaluateWhenAppliedWithContext(
// ttasksptr const& ttasks,
// const Hypothesis& cur_hypo,
// const FFState* prev_state,
// ScoreComponentCollection* accumulator) const {
// return EvaluateWhenApplied(cur_hypo, prev_state, accumulator);
// }
virtual FFState* EvaluateWhenApplied(
const ChartHypothesis& /* cur_hypo */,
int /* featureID - used to index the state in the previous hypotheses */,
ScoreComponentCollection* accumulator) const = 0;
virtual FFState* EvaluateWhenApplied(
const Syntax::SHyperedge& /* cur_hypo */,
int /* featureID - used to index the state in the previous hypotheses */,
ScoreComponentCollection* accumulator) const {
assert(false);
return 0; /* FIXME */
}
//! return the state associated with the empty hypothesis for a given sentence
virtual const FFState* EmptyHypothesisState(const InputType &input) const = 0;
bool IsStateless() const {
return false;
}
virtual void
EvaluateInIsolation
(Phrase const& source, TargetPhrase const& targetPhrase,
ScoreComponentCollection &scoreBreakdown,
ScoreComponentCollection &estimatedScores) const {}
virtual void
EvaluateWithSourceContext
(InputType const&input, InputPath const& inputPath, TargetPhrase const& targetPhrase,
StackVec const* stackVec, ScoreComponentCollection &scoreBreakdown,
ScoreComponentCollection *estimatedFutureScore = NULL) const {}
virtual void
EvaluateTranslationOptionListWithSourceContext
(const InputType &input, const TranslationOptionList &translationOptionList) const {}
};
}
|
