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
|
#include "solar_codec.h"
#include <library/cpp/codecs/greedy_dict/gd_builder.h>
#include <library/cpp/containers/comptrie/comptrie_builder.h>
#include <library/cpp/string_utils/relaxed_escaper/relaxed_escaper.h>
#include <util/stream/length.h>
#include <util/string/printf.h>
#include <util/ysaveload.h>
namespace NCodecs {
static inline ui32 Append(TBuffer& pool, TStringBuf data) {
pool.Append(data.data(), data.size());
return pool.Size();
}
void TSolarCodec::DoLearn(ISequenceReader& r) {
using namespace NGreedyDict;
Decoder.clear();
Pool.Clear();
THolder<TEntrySet> set;
{
TMemoryPool pool(8112, TMemoryPool::TLinearGrow::Instance());
TStringBufs bufs;
TStringBuf m;
while (r.NextRegion(m)) {
bufs.push_back(pool.AppendString(m));
}
{
TDictBuilder b(Settings);
b.SetInput(bufs);
b.Build(MaxEntries, MaxIterations);
set = b.ReleaseEntrySet();
}
}
set->SetScores(ES_LEN_COUNT);
{
TVector<std::pair<float, TStringBuf>> tmp;
tmp.reserve(set->size());
for (const auto& it : *set) {
tmp.push_back(std::make_pair(-it.Score, TStringBuf(it.Str).Trunc(Max<ui32>() / Max<ui32>(MaxEntries, 1))));
}
Sort(tmp.begin(), tmp.end());
Decoder.reserve(tmp.size() + 1);
Decoder.push_back(0);
for (const auto& it : tmp) {
Y_ENSURE(Decoder.back() == Pool.Size(), "learning invariant failed");
ui32 endoff = Append(Pool, it.second);
Decoder.push_back(endoff);
}
}
Pool.ShrinkToFit();
Decoder.shrink_to_fit();
TBufferOutput bout;
{
TVector<std::pair<TStringBuf, ui32>> tmp2;
tmp2.reserve(Decoder.size());
for (ui32 i = 1, sz = Decoder.size(); i < sz; ++i) {
TStringBuf s = DoDecode(i);
tmp2.push_back(std::make_pair(s, i - 1));
Y_ENSURE(s.size() == (Decoder[i] - Decoder[i - 1]), "learning invariant failed");
}
Sort(tmp2.begin(), tmp2.end());
{
TEncoder::TBuilder builder(CTBF_PREFIX_GROUPED);
for (const auto& it : tmp2) {
builder.Add(it.first.data(), it.first.size(), it.second);
}
builder.Save(bout);
}
}
Encoder.Init(TBlob::FromBuffer(bout.Buffer()));
}
void TSolarCodec::Save(IOutputStream* out) const {
TBlob b = Encoder.Data();
::Save(out, (ui32)b.Size());
out->Write(b.Data(), b.Size());
}
void TSolarCodec::Load(IInputStream* in) {
ui32 sz;
::Load(in, sz);
TLengthLimitedInput lin(in, sz);
Encoder.Init(TBlob::FromStream(lin));
Pool.Clear();
Decoder.clear();
TVector<std::pair<ui32, TString>> tmp;
ui32 poolsz = 0;
for (TEncoder::TConstIterator it = Encoder.Begin(); it != Encoder.End(); ++it) {
const TString& s = it.GetKey();
tmp.push_back(std::make_pair(it.GetValue(), !s ? TString("\0", 1) : s));
poolsz += Max<ui32>(s.size(), 1);
}
Sort(tmp.begin(), tmp.end());
Pool.Reserve(poolsz);
Decoder.reserve(tmp.size() + 1);
Decoder.push_back(0);
for (ui32 i = 0, sz2 = tmp.size(); i < sz2; ++i) {
Y_ENSURE(i == tmp[i].first, "oops! " << i << " " << tmp[i].first);
Decoder.push_back(Append(Pool, tmp[i].second));
}
Pool.ShrinkToFit();
Decoder.shrink_to_fit();
}
}
|
