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
|
#ifndef LM_SEARCH_TRIE__
#define LM_SEARCH_TRIE__
#include "lm/config.hh"
#include "lm/model_type.hh"
#include "lm/return.hh"
#include "lm/trie.hh"
#include "lm/weights.hh"
#include "util/file.hh"
#include "util/file_piece.hh"
#include <vector>
#include <assert.h>
namespace lm {
namespace ngram {
struct Backing;
class SortedVocabulary;
namespace trie {
template <class Quant, class Bhiksha> class TrieSearch;
class SortedFiles;
template <class Quant, class Bhiksha> void BuildTrie(SortedFiles &files, std::vector<uint64_t> &counts, const Config &config, TrieSearch<Quant, Bhiksha> &out, Quant &quant, const SortedVocabulary &vocab, Backing &backing);
template <class Quant, class Bhiksha> class TrieSearch {
public:
typedef NodeRange Node;
typedef ::lm::ngram::trie::UnigramPointer UnigramPointer;
typedef typename Quant::MiddlePointer MiddlePointer;
typedef typename Quant::LongestPointer LongestPointer;
static const bool kDifferentRest = false;
static const ModelType kModelType = static_cast<ModelType>(TRIE_SORTED + Quant::kModelTypeAdd + Bhiksha::kModelTypeAdd);
static const unsigned int kVersion = 1;
static void UpdateConfigFromBinary(int fd, const std::vector<uint64_t> &counts, Config &config) {
Quant::UpdateConfigFromBinary(fd, counts, config);
util::AdvanceOrThrow(fd, Quant::Size(counts.size(), config) + Unigram::Size(counts[0]));
Bhiksha::UpdateConfigFromBinary(fd, config);
}
static std::size_t Size(const std::vector<uint64_t> &counts, const Config &config) {
std::size_t ret = Quant::Size(counts.size(), config) + Unigram::Size(counts[0]);
for (unsigned char i = 1; i < counts.size() - 1; ++i) {
ret += Middle::Size(Quant::MiddleBits(config), counts[i], counts[0], counts[i+1], config);
}
return ret + Longest::Size(Quant::LongestBits(config), counts.back(), counts[0]);
}
TrieSearch() : middle_begin_(NULL), middle_end_(NULL) {}
~TrieSearch() { FreeMiddles(); }
uint8_t *SetupMemory(uint8_t *start, const std::vector<uint64_t> &counts, const Config &config);
void LoadedBinary();
void InitializeFromARPA(const char *file, util::FilePiece &f, std::vector<uint64_t> &counts, const Config &config, SortedVocabulary &vocab, Backing &backing);
unsigned char Order() const {
return middle_end_ - middle_begin_ + 2;
}
ProbBackoff &UnknownUnigram() { return unigram_.Unknown(); }
UnigramPointer LookupUnigram(WordIndex word, Node &next, bool &independent_left, uint64_t &extend_left) const {
extend_left = static_cast<uint64_t>(word);
UnigramPointer ret(unigram_.Find(word, next));
independent_left = (next.begin == next.end);
return ret;
}
MiddlePointer Unpack(uint64_t extend_pointer, unsigned char extend_length, Node &node) const {
return MiddlePointer(quant_, extend_length - 2, middle_begin_[extend_length - 2].ReadEntry(extend_pointer, node));
}
MiddlePointer LookupMiddle(unsigned char order_minus_2, WordIndex word, Node &node, bool &independent_left, uint64_t &extend_left) const {
util::BitAddress address(middle_begin_[order_minus_2].Find(word, node, extend_left));
independent_left = (address.base == NULL) || (node.begin == node.end);
return MiddlePointer(quant_, order_minus_2, address);
}
LongestPointer LookupLongest(WordIndex word, const Node &node) const {
return LongestPointer(quant_, longest_.Find(word, node));
}
bool FastMakeNode(const WordIndex *begin, const WordIndex *end, Node &node) const {
assert(begin != end);
bool independent_left;
uint64_t ignored;
LookupUnigram(*begin, node, independent_left, ignored);
for (const WordIndex *i = begin + 1; i < end; ++i) {
if (independent_left || !LookupMiddle(i - begin - 1, *i, node, independent_left, ignored).Found()) return false;
}
return true;
}
private:
friend void BuildTrie<Quant, Bhiksha>(SortedFiles &files, std::vector<uint64_t> &counts, const Config &config, TrieSearch<Quant, Bhiksha> &out, Quant &quant, const SortedVocabulary &vocab, Backing &backing);
// Middles are managed manually so we can delay construction and they don't have to be copyable.
void FreeMiddles() {
for (const Middle *i = middle_begin_; i != middle_end_; ++i) {
i->~Middle();
}
free(middle_begin_);
}
typedef trie::BitPackedMiddle<Bhiksha> Middle;
typedef trie::BitPackedLongest Longest;
Longest longest_;
Middle *middle_begin_, *middle_end_;
Quant quant_;
typedef ::lm::ngram::trie::Unigram Unigram;
Unigram unigram_;
};
} // namespace trie
} // namespace ngram
} // namespace lm
#endif // LM_SEARCH_TRIE__
|
