Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/common/intfeaturedist.cpp @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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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 // File: intfeaturedist.cpp
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5 // Description: Fast set-difference-based feature distance calculator.
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6 //
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 //
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17 ///////////////////////////////////////////////////////////////////////
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18
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19 #include "intfeaturedist.h"
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20 #include "intfeaturemap.h"
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21
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22 namespace tesseract {
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23
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24 IntFeatureDist::IntFeatureDist()
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25 : size_(0)
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26 , total_feature_weight_(0.0)
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27 , feature_map_(nullptr)
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28 , features_(nullptr)
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29 , features_delta_one_(nullptr)
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30 , features_delta_two_(nullptr) {}
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31
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32 IntFeatureDist::~IntFeatureDist() {
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33 Clear();
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34 }
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35
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36 // Initialize the table to the given size of feature space.
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37 void IntFeatureDist::Init(const IntFeatureMap *feature_map) {
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38 size_ = feature_map->sparse_size();
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39 Clear();
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40 feature_map_ = feature_map;
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41 features_ = new bool[size_];
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42 features_delta_one_ = new bool[size_];
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43 features_delta_two_ = new bool[size_];
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44 memset(features_, false, size_ * sizeof(features_[0]));
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45 memset(features_delta_one_, false, size_ * sizeof(features_delta_one_[0]));
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46 memset(features_delta_two_, false, size_ * sizeof(features_delta_two_[0]));
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47 total_feature_weight_ = 0.0;
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48 }
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49
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50 // Setup the map for the given indexed_features that have been indexed by
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51 // feature_map.
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52 void IntFeatureDist::Set(const std::vector<int> &indexed_features, int canonical_count,
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53 bool value) {
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54 total_feature_weight_ = canonical_count;
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55 for (int f : indexed_features) {
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56 features_[f] = value;
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57 for (int dir = -kNumOffsetMaps; dir <= kNumOffsetMaps; ++dir) {
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58 if (dir == 0) {
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59 continue;
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60 }
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61 const int mapped_f = feature_map_->OffsetFeature(f, dir);
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62 if (mapped_f >= 0) {
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63 features_delta_one_[mapped_f] = value;
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64 for (int dir2 = -kNumOffsetMaps; dir2 <= kNumOffsetMaps; ++dir2) {
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65 if (dir2 == 0) {
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66 continue;
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67 }
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68 const int mapped_f2 = feature_map_->OffsetFeature(mapped_f, dir2);
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69 if (mapped_f2 >= 0) {
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70 features_delta_two_[mapped_f2] = value;
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71 }
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72 }
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73 }
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74 }
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75 }
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76 }
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77
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78 // Compute the distance between the given feature vector and the last
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79 // Set feature vector.
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80 double IntFeatureDist::FeatureDistance(const std::vector<int> &features) const {
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81 const int num_test_features = features.size();
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82 const double denominator = total_feature_weight_ + num_test_features;
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83 double misses = denominator;
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84 for (int i = 0; i < num_test_features; ++i) {
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85 const int index = features[i];
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86 const double weight = 1.0;
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87 if (features_[index]) {
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88 // A perfect match.
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89 misses -= 2.0 * weight;
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90 } else if (features_delta_one_[index]) {
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91 misses -= 1.5 * weight;
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92 } else if (features_delta_two_[index]) {
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93 // A near miss.
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94 misses -= 1.0 * weight;
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95 }
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96 }
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97 return misses / denominator;
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98 }
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99
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100 // Compute the distance between the given feature vector and the last
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101 // Set feature vector.
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102 double IntFeatureDist::DebugFeatureDistance(const std::vector<int> &features) const {
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103 const int num_test_features = features.size();
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104 const double denominator = total_feature_weight_ + num_test_features;
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105 double misses = denominator;
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106 for (int i = 0; i < num_test_features; ++i) {
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107 const int index = features[i];
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108 const double weight = 1.0;
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109 INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(features[i]);
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110 tprintf("Testing feature weight %g:", weight);
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111 f.print();
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112 if (features_[index]) {
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113 // A perfect match.
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114 misses -= 2.0 * weight;
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115 tprintf("Perfect hit\n");
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116 } else if (features_delta_one_[index]) {
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117 misses -= 1.5 * weight;
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118 tprintf("-1 hit\n");
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119 } else if (features_delta_two_[index]) {
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120 // A near miss.
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121 misses -= 1.0 * weight;
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122 tprintf("-2 hit\n");
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123 } else {
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124 tprintf("Total miss\n");
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125 }
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126 }
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127 tprintf("Features present:");
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128 for (int i = 0; i < size_; ++i) {
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129 if (features_[i]) {
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130 INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(i);
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131 f.print();
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132 }
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133 }
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134 tprintf("\nMinus one features:");
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135 for (int i = 0; i < size_; ++i) {
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136 if (features_delta_one_[i]) {
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137 INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(i);
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138 f.print();
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139 }
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140 }
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141 tprintf("\nMinus two features:");
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142 for (int i = 0; i < size_; ++i) {
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143 if (features_delta_two_[i]) {
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144 INT_FEATURE_STRUCT f = feature_map_->InverseMapFeature(i);
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145 f.print();
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146 }
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147 }
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148 tprintf("\n");
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149 return misses / denominator;
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150 }
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151
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152 // Clear all data.
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153 void IntFeatureDist::Clear() {
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154 delete[] features_;
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155 features_ = nullptr;
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156 delete[] features_delta_one_;
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157 features_delta_one_ = nullptr;
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158 delete[] features_delta_two_;
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159 features_delta_two_ = nullptr;
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160 }
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161
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162 } // namespace tesseract