summaryrefslogtreecommitdiff
path: root/training/dtrain/score.h
blob: 62d8f5876abda18f33fd559f9bd4ef770318e50d (plain)
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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
#ifndef _DTRAIN_SCORE_H_
#define _DTRAIN_SCORE_H_

#include "dtrain.h"

namespace dtrain
{


struct NgramCounts
{
  unsigned N_;
  map<unsigned, score_t> clipped_;
  map<unsigned, score_t> sum_;

  NgramCounts(const unsigned N) : N_(N) { Zero(); }

  inline void
  operator+=(const NgramCounts& rhs)
  {
    if (rhs.N_ > N_) Resize(rhs.N_);
    for (unsigned i = 0; i < N_; i++) {
      this->clipped_[i] += rhs.clipped_.find(i)->second;
      this->sum_[i] += rhs.sum_.find(i)->second;
    }
  }

  inline const NgramCounts
  operator+(const NgramCounts &other) const
  {
    NgramCounts result = *this;
    result += other;
    return result;
  }

  inline void
  operator*=(const score_t rhs)
  {
    for (unsigned i = 0; i < N_; i++) {
      this->clipped_[i] *= rhs;
      this->sum_[i] *= rhs;
    }
  }

  inline void
  Add(const unsigned count, const unsigned ref_count, const unsigned i)
  {
    assert(i < N_);
    if (count > ref_count) {
      clipped_[i] += ref_count;
    } else {
      clipped_[i] += count;
    }
    sum_[i] += count;
  }

  inline void
  Zero()
  {
    for (unsigned i = 0; i < N_; i++) {
      clipped_[i] = 0.;
      sum_[i] = 0.;
    }
  }

  inline void
  One()
  {
    for (unsigned i = 0; i < N_; i++) {
      clipped_[i] = 1.;
      sum_[i] = 1.;
    }
  }

  inline void
  Print()
  {
    for (unsigned i = 0; i < N_; i++) {
      cout << i+1 << "grams (clipped):\t" << clipped_[i] << endl;
      cout << i+1 << "grams:\t\t\t" << sum_[i] << endl;
    }
  }

  inline void Resize(unsigned N)
  {
    if (N == N_) return;
    else if (N > N_) {
      for (unsigned i = N_; i < N; i++) {
        clipped_[i] = 0.;
        sum_[i] = 0.;
      }
    } else { // N < N_
      for (unsigned i = N_-1; i > N-1; i--) {
        clipped_.erase(i);
        sum_.erase(i);
      }
    }
    N_ = N;
  }
};

typedef map<vector<WordID>, unsigned> Ngrams;

inline Ngrams
make_ngrams(const vector<WordID>& s, const unsigned N)
{
  Ngrams ngrams;
  vector<WordID> ng;
  for (size_t i = 0; i < s.size(); i++) {
    ng.clear();
    for (unsigned j = i; j < min(i+N, s.size()); j++) {
      ng.push_back(s[j]);
      ngrams[ng]++;
    }
  }
  return ngrams;
}

inline NgramCounts
make_ngram_counts(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned N)
{
  Ngrams hyp_ngrams = make_ngrams(hyp, N);
  vector<Ngrams> refs_ngrams;
  for (auto r: refs) {
    Ngrams r_ng = make_ngrams(r, N);
    refs_ngrams.push_back(r_ng);
  }
  NgramCounts counts(N);
  Ngrams::iterator it;
  Ngrams::iterator ti;
  for (it = hyp_ngrams.begin(); it != hyp_ngrams.end(); it++) {
    unsigned max_ref_count = 0;
    for (auto ref_ngrams: refs_ngrams) {
      ti = ref_ngrams.find(it->first);
      if (ti != ref_ngrams.end())
        max_ref_count = max(max_ref_count, ti->second);
    }
    counts.Add(it->second, min(it->second, max_ref_count), it->first.size() - 1);
  }
  return counts;
}

struct BleuScorer : public LocalScorer
{
  score_t Bleu(NgramCounts& counts, const unsigned hyp_len, const unsigned ref_len);
  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned /*rank*/, const unsigned /*src_len*/);
  void Reset() {}
};

struct StupidBleuScorer : public LocalScorer
{
  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned /*rank*/, const unsigned /*src_len*/);
  void Reset() {}
};

struct FixedStupidBleuScorer : public LocalScorer
{
  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned /*rank*/, const unsigned /*src_len*/);
  void Reset() {}
};

struct SmoothBleuScorer : public LocalScorer
{
  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned /*rank*/, const unsigned /*src_len*/);
  void Reset() {}
};

struct SumBleuScorer : public LocalScorer
{
  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned /*rank*/, const unsigned /*src_len*/);
  void Reset() {}
};

struct SumExpBleuScorer : public LocalScorer
{
  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned /*rank*/, const unsigned /*src_len*/);
  void Reset() {}
};

struct SumWhateverBleuScorer : public LocalScorer
{
  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned /*rank*/, const unsigned /*src_len*/);
  void Reset() {};
};

struct ApproxBleuScorer : public BleuScorer
{
  NgramCounts glob_onebest_counts_;
  unsigned glob_hyp_len_, glob_ref_len_, glob_src_len_;
  score_t discount_;

  ApproxBleuScorer(unsigned N, score_t d) : glob_onebest_counts_(NgramCounts(N)), discount_(d)
  {
    glob_hyp_len_ = glob_ref_len_ = glob_src_len_ = 0;
  }

  inline void Reset() {
    glob_onebest_counts_.Zero();
    glob_hyp_len_ = glob_ref_len_ = glob_src_len_ = 0.;
  }

  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned rank, const unsigned src_len);
};

struct LinearBleuScorer : public BleuScorer
{
  unsigned onebest_len_;
  NgramCounts onebest_counts_;

  LinearBleuScorer(unsigned N) : onebest_len_(1), onebest_counts_(N)
  {
    onebest_counts_.One();
  }

  score_t Score(const vector<WordID>& hyp, const vector<vector<WordID> >& refs, const unsigned rank, const unsigned /*src_len*/);

  inline void Reset() {
    onebest_len_ = 1;
    onebest_counts_.One();
  }
};


} // namespace

#endif