Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/lstm/stridemap.cpp @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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rev   line source
2
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: stridemap.cpp
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3 // Description: Indexing into a 4-d tensor held in a 2-d Array.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2016, Google Inc.
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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 #include "stridemap.h"
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19 #include <cassert> // for assert
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21 namespace tesseract {
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22
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23 // Returns true if *this is a valid index.
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24 bool StrideMap::Index::IsValid() const {
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25 // Cheap check first.
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26 for (int index : indices_) {
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27 if (index < 0) {
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28 return false;
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29 }
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30 }
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31 for (int d = 0; d < FD_DIMSIZE; ++d) {
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32 if (indices_[d] > MaxIndexOfDim(static_cast<FlexDimensions>(d))) {
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33 return false;
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34 }
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35 }
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36 return true;
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37 }
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38
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39 // Returns true if the index of the given dimension is the last.
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40 bool StrideMap::Index::IsLast(FlexDimensions dimension) const {
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41 return MaxIndexOfDim(dimension) == indices_[dimension];
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42 }
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43
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44 // Given that the dimensions up to and including dim-1 are valid, returns the
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45 // maximum index for dimension dim.
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46 int StrideMap::Index::MaxIndexOfDim(FlexDimensions dim) const {
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47 int max_index = stride_map_->shape_[dim] - 1;
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48 if (dim == FD_BATCH) {
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49 return max_index;
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50 }
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51 assert(0 <= indices_[FD_BATCH]);
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52 const size_t batch = indices_[FD_BATCH];
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53 if (dim == FD_HEIGHT) {
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54 if (batch >= stride_map_->heights_.size() || stride_map_->heights_[batch] > max_index) {
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55 return max_index;
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56 }
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57 return stride_map_->heights_[batch] - 1;
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58 }
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59 if (batch >= stride_map_->widths_.size() || stride_map_->widths_[batch] > max_index) {
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60 return max_index;
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61 }
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62 return stride_map_->widths_[batch] - 1;
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63 }
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64
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65 // Adds the given offset to the given dimension. Returns true if the result
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66 // makes a valid index.
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67 bool StrideMap::Index::AddOffset(int offset, FlexDimensions dimension) {
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68 indices_[dimension] += offset;
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69 SetTFromIndices();
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70 return IsValid();
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71 }
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72
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73 // Increments the index in some encapsulated way that guarantees to remain
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74 // valid until it returns false, meaning that the iteration is complete.
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75 bool StrideMap::Index::Increment() {
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76 for (int d = FD_DIMSIZE - 1; d >= 0; --d) {
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77 if (!IsLast(static_cast<FlexDimensions>(d))) {
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78 t_ += stride_map_->t_increments_[d];
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79 ++indices_[d];
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80 return true;
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81 }
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82 t_ -= stride_map_->t_increments_[d] * indices_[d];
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83 indices_[d] = 0;
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84 // Now carry to the next dimension.
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85 }
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86 return false;
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87 }
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88
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89 // Decrements the index in some encapsulated way that guarantees to remain
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90 // valid until it returns false, meaning that the iteration (that started
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91 // with InitToLast()) is complete.
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92 bool StrideMap::Index::Decrement() {
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93 for (int d = FD_DIMSIZE - 1; d >= 0; --d) {
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94 if (indices_[d] > 0) {
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95 --indices_[d];
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96 if (d == FD_BATCH) {
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97 // The upper limits of the other dimensions may have changed as a result
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98 // of a different batch index, so they have to be reset.
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99 InitToLastOfBatch(indices_[FD_BATCH]);
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100 } else {
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101 t_ -= stride_map_->t_increments_[d];
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102 }
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103 return true;
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104 }
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105 indices_[d] = MaxIndexOfDim(static_cast<FlexDimensions>(d));
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106 t_ += stride_map_->t_increments_[d] * indices_[d];
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107 // Now borrow from the next dimension.
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108 }
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109 return false;
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110 }
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111
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112 // Initializes the indices to the last valid location in the given batch
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113 // index.
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114 void StrideMap::Index::InitToLastOfBatch(int batch) {
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115 indices_[FD_BATCH] = batch;
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116 for (int d = FD_BATCH + 1; d < FD_DIMSIZE; ++d) {
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117 indices_[d] = MaxIndexOfDim(static_cast<FlexDimensions>(d));
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118 }
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119 SetTFromIndices();
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120 }
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121
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122 // Computes and sets t_ from the current indices_.
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123 void StrideMap::Index::SetTFromIndices() {
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124 t_ = 0;
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125 for (int d = 0; d < FD_DIMSIZE; ++d) {
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126 t_ += stride_map_->t_increments_[d] * indices_[d];
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127 }
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128 }
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129
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130 // Sets up the stride for the given array of height, width pairs.
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131 void StrideMap::SetStride(const std::vector<std::pair<int, int>> &h_w_pairs) {
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132 int max_height = 0;
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133 int max_width = 0;
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134 for (const std::pair<int, int> &hw : h_w_pairs) {
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135 int height = hw.first;
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136 int width = hw.second;
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137 heights_.push_back(height);
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138 widths_.push_back(width);
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139 if (height > max_height) {
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140 max_height = height;
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141 }
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142 if (width > max_width) {
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143 max_width = width;
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144 }
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145 }
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146 shape_[FD_BATCH] = heights_.size();
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147 shape_[FD_HEIGHT] = max_height;
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148 shape_[FD_WIDTH] = max_width;
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149 ComputeTIncrements();
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150 }
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151
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152 // Scales width and height dimensions by the given factors.
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153 void StrideMap::ScaleXY(int x_factor, int y_factor) {
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154 for (int &height : heights_) {
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155 height /= y_factor;
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156 }
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157 for (int &width : widths_) {
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158 width /= x_factor;
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159 }
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diff changeset
160 shape_[FD_HEIGHT] /= y_factor;
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161 shape_[FD_WIDTH] /= x_factor;
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162 ComputeTIncrements();
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163 }
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164
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165 // Reduces width to 1, across the batch, whatever the input size.
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parents:
diff changeset
166 void StrideMap::ReduceWidthTo1() {
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diff changeset
167 widths_.assign(widths_.size(), 1);
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diff changeset
168 shape_[FD_WIDTH] = 1;
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diff changeset
169 ComputeTIncrements();
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170 }
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171
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172 // Transposes the width and height dimensions.
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parents:
diff changeset
173 void StrideMap::TransposeXY() {
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parents:
diff changeset
174 std::swap(shape_[FD_HEIGHT], shape_[FD_WIDTH]);
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175 std::swap(heights_, widths_);
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176 ComputeTIncrements();
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177 }
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178
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179 // Computes t_increments_ from shape_.
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parents:
diff changeset
180 void StrideMap::ComputeTIncrements() {
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parents:
diff changeset
181 t_increments_[FD_DIMSIZE - 1] = 1;
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parents:
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182 for (int d = FD_DIMSIZE - 2; d >= 0; --d) {
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183 t_increments_[d] = t_increments_[d + 1] * shape_[d + 1];
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184 }
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185 }
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186
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diff changeset
187 } // namespace tesseract