Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/common/sampleiterator.cpp @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 // Copyright 2011 Google Inc. All Rights Reserved.
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2 // Author: rays@google.com (Ray Smith)
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3 //
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4 // Licensed under the Apache License, Version 2.0 (the "License");
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5 // you may not use this file except in compliance with the License.
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6 // You may obtain a copy of the License at
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7 // http://www.apache.org/licenses/LICENSE-2.0
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8 // Unless required by applicable law or agreed to in writing, software
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9 // distributed under the License is distributed on an "AS IS" BASIS,
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10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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11 // See the License for the specific language governing permissions and
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12 // limitations under the License.
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13 //
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14 ///////////////////////////////////////////////////////////////////////
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16 #include "sampleiterator.h"
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18 #include "intfeaturemap.h"
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20 #include "indexmapbidi.h"
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21 #include "shapetable.h"
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22 #include "trainingsample.h"
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23 #include "trainingsampleset.h"
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25 namespace tesseract {
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27 // ================== SampleIterator Implementation =================
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29 SampleIterator::SampleIterator()
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30 : charset_map_(nullptr)
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31 , shape_table_(nullptr)
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32 , sample_set_(nullptr)
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33 , randomize_(false)
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34 , owned_shape_table_(nullptr) {
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35 num_shapes_ = 0;
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36 Begin();
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37 }
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38
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39 SampleIterator::~SampleIterator() {
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40 Clear();
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41 }
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43 void SampleIterator::Clear() {
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44 delete owned_shape_table_;
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45 owned_shape_table_ = nullptr;
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46 }
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47
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48 // See class comment for arguments.
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49 void SampleIterator::Init(const IndexMapBiDi *charset_map, const ShapeTable *shape_table,
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50 bool randomize, TrainingSampleSet *sample_set) {
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51 Clear();
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52 charset_map_ = charset_map;
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53 shape_table_ = shape_table;
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54 sample_set_ = sample_set;
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55 randomize_ = randomize;
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56 if (shape_table_ == nullptr && charset_map_ != nullptr) {
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57 // The caller wishes to iterate by class. The easiest way to do this
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58 // is to create a dummy shape_table_ that we will own.
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59 int num_fonts = sample_set_->NumFonts();
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60 owned_shape_table_ = new ShapeTable(sample_set_->unicharset());
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61 int charsetsize = sample_set_->unicharset().size();
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62 for (int c = 0; c < charsetsize; ++c) {
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63 // We always add a shape for each character to keep the index in sync
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64 // with the unichar_id.
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65 int shape_id = owned_shape_table_->AddShape(c, 0);
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66 for (int f = 1; f < num_fonts; ++f) {
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67 if (sample_set_->NumClassSamples(f, c, true) > 0) {
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68 owned_shape_table_->AddToShape(shape_id, c, f);
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69 }
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70 }
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71 }
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72 shape_table_ = owned_shape_table_;
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73 }
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74 if (shape_table_ != nullptr) {
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75 num_shapes_ = shape_table_->NumShapes();
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76 } else {
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77 num_shapes_ = randomize ? sample_set_->num_samples() : sample_set_->num_raw_samples();
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78 }
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79 Begin();
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80 }
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81
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82 // Iterator functions designed for use with a simple for loop:
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83 // for (it.Begin(); !it.AtEnd(); it.Next()) {
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84 // const TrainingSample& sample = it.GetSample();
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85 // }
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86 void SampleIterator::Begin() {
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87 shape_index_ = -1;
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88 shape_char_index_ = 0;
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89 num_shape_chars_ = 0;
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90 shape_font_index_ = 0;
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91 num_shape_fonts_ = 0;
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92 sample_index_ = 0;
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93 num_samples_ = 0;
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94 // Find the first indexable sample.
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95 Next();
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96 }
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97
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98 bool SampleIterator::AtEnd() const {
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99 return shape_index_ >= num_shapes_;
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100 }
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101
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diff changeset
102 const TrainingSample &SampleIterator::GetSample() const {
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diff changeset
103 if (shape_table_ != nullptr) {
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104 const UnicharAndFonts *shape_entry = GetShapeEntry();
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105 int char_id = shape_entry->unichar_id;
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diff changeset
106 int font_id = shape_entry->font_ids[shape_font_index_];
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Franz Glasner <fzglas.hg@dom66.de>
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107 return *sample_set_->GetSample(font_id, char_id, sample_index_);
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parents:
diff changeset
108 } else {
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parents:
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109 return *sample_set_->GetSample(shape_index_);
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110 }
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111 }
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112
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diff changeset
113 TrainingSample *SampleIterator::MutableSample() const {
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diff changeset
114 if (shape_table_ != nullptr) {
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115 const UnicharAndFonts *shape_entry = GetShapeEntry();
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116 int char_id = shape_entry->unichar_id;
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117 int font_id = shape_entry->font_ids[shape_font_index_];
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118 return sample_set_->MutableSample(font_id, char_id, sample_index_);
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119 } else {
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120 return sample_set_->mutable_sample(shape_index_);
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121 }
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122 }
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123
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124 // Returns the total index (from the original set of samples) of the current
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125 // sample.
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126 int SampleIterator::GlobalSampleIndex() const {
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127 if (shape_table_ != nullptr) {
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128 const UnicharAndFonts *shape_entry = GetShapeEntry();
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129 int char_id = shape_entry->unichar_id;
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130 int font_id = shape_entry->font_ids[shape_font_index_];
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131 return sample_set_->GlobalSampleIndex(font_id, char_id, sample_index_);
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parents:
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132 } else {
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parents:
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133 return shape_index_;
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134 }
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135 }
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136
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137 // Returns the index of the current sample in compact charset space, so
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138 // in a 2-class problem between x and y, the returned indices will all be
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Franz Glasner <fzglas.hg@dom66.de>
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139 // 0 or 1, and have nothing to do with the unichar_ids.
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140 // If the charset_map_ is nullptr, then this is equal to GetSparseClassID().
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parents:
diff changeset
141 int SampleIterator::GetCompactClassID() const {
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Franz Glasner <fzglas.hg@dom66.de>
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142 return charset_map_ != nullptr ? charset_map_->SparseToCompact(shape_index_) : GetSparseClassID();
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143 }
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parents:
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144 // Returns the index of the current sample in sparse charset space, so
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parents:
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145 // in a 2-class problem between x and y, the returned indices will all be
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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146 // x or y, where x and y may be unichar_ids (no shape_table_) or shape_ids
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147 // with a shape_table_.
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parents:
diff changeset
148 int SampleIterator::GetSparseClassID() const {
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149 return shape_table_ != nullptr ? shape_index_ : GetSample().class_id();
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150 }
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diff changeset
151
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152 // Moves on to the next indexable sample. If the end is reached, leaves
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153 // the state such that AtEnd() is true.
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parents:
diff changeset
154 void SampleIterator::Next() {
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diff changeset
155 if (shape_table_ != nullptr) {
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parents:
diff changeset
156 // Next sample in this class/font combination.
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parents:
diff changeset
157 ++sample_index_;
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parents:
diff changeset
158 if (sample_index_ < num_samples_) {
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parents:
diff changeset
159 return;
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parents:
diff changeset
160 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 // Next font in this class in this shape.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 sample_index_ = 0;
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parents:
diff changeset
163 do {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 ++shape_font_index_;
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parents:
diff changeset
165 if (shape_font_index_ >= num_shape_fonts_) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 // Next unichar in this shape.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 shape_font_index_ = 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 ++shape_char_index_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 if (shape_char_index_ >= num_shape_chars_) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
170 // Find the next shape that is mapped in the charset_map_.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 shape_char_index_ = 0;
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parents:
diff changeset
172 do {
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parents:
diff changeset
173 ++shape_index_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 } while (shape_index_ < num_shapes_ && charset_map_ != nullptr &&
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 charset_map_->SparseToCompact(shape_index_) < 0);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 if (shape_index_ >= num_shapes_) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 return; // The end.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 num_shape_chars_ = shape_table_->GetShape(shape_index_).size();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 const UnicharAndFonts *shape_entry = GetShapeEntry();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 num_shape_fonts_ = shape_entry->font_ids.size();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 int char_id = shape_entry->unichar_id;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 int font_id = shape_entry->font_ids[shape_font_index_];
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 num_samples_ = sample_set_->NumClassSamples(font_id, char_id, randomize_);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 } while (num_samples_ == 0);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 } else {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 // We are just iterating over the samples.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 ++shape_index_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 // Returns the size of the compact charset space.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 int SampleIterator::CompactCharsetSize() const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 return charset_map_ != nullptr ? charset_map_->CompactSize() : SparseCharsetSize();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198
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199 // Returns the size of the sparse charset space.
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200 int SampleIterator::SparseCharsetSize() const {
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201 return charset_map_ != nullptr
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202 ? charset_map_->SparseSize()
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203 : (shape_table_ != nullptr ? shape_table_->NumShapes() : sample_set_->charsetsize());
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204 }
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205
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206 // Sets the mapped_features_ from the features using the provided
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207 // feature_map.
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208 static void MapFeatures(TrainingSample &s, const IntFeatureMap &feature_map) {
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209 std::vector<int> indexed_features;
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210 feature_map.feature_space().IndexAndSortFeatures(s.features(), s.num_features(),
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211 &indexed_features);
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212 feature_map.MapIndexedFeatures(indexed_features, &s.mapped_features_);
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213 s.features_are_indexed_ = false;
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214 s.features_are_mapped_ = true;
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215 }
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216
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217 // Apply the supplied feature_space/feature_map transform to all samples
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218 // accessed by this iterator.
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219 void SampleIterator::MapSampleFeatures(const IntFeatureMap &feature_map) {
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220 for (Begin(); !AtEnd(); Next()) {
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221 TrainingSample *sample = MutableSample();
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222 MapFeatures(*sample, feature_map);
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223 }
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224 }
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225
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226 // Adjust the weights of all the samples to be uniform in the given charset.
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227 // Returns the number of samples in the iterator.
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228 int SampleIterator::UniformSamples() {
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229 int num_good_samples = 0;
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230 for (Begin(); !AtEnd(); Next()) {
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231 TrainingSample *sample = MutableSample();
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232 sample->set_weight(1.0);
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233 ++num_good_samples;
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234 }
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235 NormalizeSamples();
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236 return num_good_samples;
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237 }
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238
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239 // Normalize the weights of all the samples in the charset_map so they sum
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240 // to 1. Returns the minimum assigned sample weight.
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241 double SampleIterator::NormalizeSamples() {
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242 double total_weight = 0.0;
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243 for (Begin(); !AtEnd(); Next()) {
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244 const TrainingSample &sample = GetSample();
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245 total_weight += sample.weight();
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246 }
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247 // Normalize samples.
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248 double min_assigned_sample_weight = 1.0;
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249 if (total_weight > 0.0) {
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250 for (Begin(); !AtEnd(); Next()) {
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251 TrainingSample *sample = MutableSample();
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252 double weight = sample->weight() / total_weight;
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253 if (weight < min_assigned_sample_weight) {
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254 min_assigned_sample_weight = weight;
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255 }
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256 sample->set_weight(weight);
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257 }
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258 }
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259 return min_assigned_sample_weight;
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260 }
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261
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262 // Helper returns the current UnicharAndFont shape_entry.
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263 const UnicharAndFonts *SampleIterator::GetShapeEntry() const {
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264 const Shape &shape = shape_table_->GetShape(shape_index_);
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265 return &shape[shape_char_index_];
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266 }
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267
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268 } // namespace tesseract.