Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/lstm/reconfig.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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1 ///////////////////////////////////////////////////////////////////////
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2 // File: reconfig.cpp
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3 // Description: Network layer that reconfigures the scaling vs feature
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4 // depth.
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5 // Author: Ray Smith
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6 //
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7 // (C) Copyright 2014, Google Inc.
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8 // Licensed under the Apache License, Version 2.0 (the "License");
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9 // you may not use this file except in compliance with the License.
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10 // You may obtain a copy of the License at
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11 // http://www.apache.org/licenses/LICENSE-2.0
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 ///////////////////////////////////////////////////////////////////////
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19 #include "reconfig.h"
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21 namespace tesseract {
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23 Reconfig::Reconfig(const std::string &name, int ni, int x_scale, int y_scale)
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24 : Network(NT_RECONFIG, name, ni, ni * x_scale * y_scale)
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25 , x_scale_(x_scale)
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26 , y_scale_(y_scale) {}
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28 // Returns the shape output from the network given an input shape (which may
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29 // be partially unknown ie zero).
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30 StaticShape Reconfig::OutputShape(const StaticShape &input_shape) const {
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31 StaticShape result = input_shape;
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32 result.set_height(result.height() / y_scale_);
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33 result.set_width(result.width() / x_scale_);
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34 if (type_ != NT_MAXPOOL) {
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35 result.set_depth(result.depth() * y_scale_ * x_scale_);
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36 }
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37 return result;
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38 }
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39
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40 // Returns an integer reduction factor that the network applies to the
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41 // time sequence. Assumes that any 2-d is already eliminated. Used for
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42 // scaling bounding boxes of truth data.
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43 // WARNING: if GlobalMinimax is used to vary the scale, this will return
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44 // the last used scale factor. Call it before any forward, and it will return
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45 // the minimum scale factor of the paths through the GlobalMinimax.
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46 int Reconfig::XScaleFactor() const {
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47 return x_scale_;
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48 }
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49
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50 // Writes to the given file. Returns false in case of error.
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51 bool Reconfig::Serialize(TFile *fp) const {
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52 return Network::Serialize(fp) && fp->Serialize(&x_scale_) && fp->Serialize(&y_scale_);
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53 }
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55 // Reads from the given file. Returns false in case of error.
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56 bool Reconfig::DeSerialize(TFile *fp) {
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57 if (!fp->DeSerialize(&x_scale_)) {
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58 return false;
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59 }
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60 if (!fp->DeSerialize(&y_scale_)) {
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61 return false;
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62 }
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63 no_ = ni_ * x_scale_ * y_scale_;
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64 return true;
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65 }
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66
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67 // Runs forward propagation of activations on the input line.
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68 // See NetworkCpp for a detailed discussion of the arguments.
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69 void Reconfig::Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
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70 NetworkScratch *scratch, NetworkIO *output) {
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71 output->ResizeScaled(input, x_scale_, y_scale_, no_);
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72 back_map_ = input.stride_map();
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73 StrideMap::Index dest_index(output->stride_map());
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74 do {
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75 int out_t = dest_index.t();
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76 StrideMap::Index src_index(input.stride_map(), dest_index.index(FD_BATCH),
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77 dest_index.index(FD_HEIGHT) * y_scale_,
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78 dest_index.index(FD_WIDTH) * x_scale_);
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79 // Stack x_scale_ groups of y_scale_ inputs together.
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80 for (int x = 0; x < x_scale_; ++x) {
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81 for (int y = 0; y < y_scale_; ++y) {
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82 StrideMap::Index src_xy(src_index);
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83 if (src_xy.AddOffset(x, FD_WIDTH) && src_xy.AddOffset(y, FD_HEIGHT)) {
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84 output->CopyTimeStepGeneral(out_t, (x * y_scale_ + y) * ni_, ni_, input, src_xy.t(), 0);
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85 }
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86 }
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87 }
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88 } while (dest_index.Increment());
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89 }
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90
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91 // Runs backward propagation of errors on the deltas line.
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92 // See NetworkCpp for a detailed discussion of the arguments.
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93 bool Reconfig::Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
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94 NetworkIO *back_deltas) {
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95 back_deltas->ResizeToMap(fwd_deltas.int_mode(), back_map_, ni_);
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96 StrideMap::Index src_index(fwd_deltas.stride_map());
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97 do {
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98 int in_t = src_index.t();
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99 StrideMap::Index dest_index(back_deltas->stride_map(), src_index.index(FD_BATCH),
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100 src_index.index(FD_HEIGHT) * y_scale_,
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101 src_index.index(FD_WIDTH) * x_scale_);
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102 // Unstack x_scale_ groups of y_scale_ inputs that are together.
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103 for (int x = 0; x < x_scale_; ++x) {
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104 for (int y = 0; y < y_scale_; ++y) {
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105 StrideMap::Index dest_xy(dest_index);
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106 if (dest_xy.AddOffset(x, FD_WIDTH) && dest_xy.AddOffset(y, FD_HEIGHT)) {
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107 back_deltas->CopyTimeStepGeneral(dest_xy.t(), 0, ni_, fwd_deltas, in_t,
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108 (x * y_scale_ + y) * ni_);
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109 }
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110 }
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111 }
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112 } while (src_index.Increment());
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113 return needs_to_backprop_;
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114 }
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115
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116 } // namespace tesseract.