Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/lstm/reversed.cpp @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
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children
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: reversed.cpp
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3 // Description: Runs a single network on time-reversed input, reversing output.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2013, 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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18 #include "reversed.h"
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20 #include <cstdio>
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22 #include "networkscratch.h"
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24 namespace tesseract {
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26 Reversed::Reversed(const std::string &name, NetworkType type) : Plumbing(name) {
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27 type_ = type;
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28 }
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30 // Returns the shape output from the network given an input shape (which may
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31 // be partially unknown ie zero).
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32 StaticShape Reversed::OutputShape(const StaticShape &input_shape) const {
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33 if (type_ == NT_XYTRANSPOSE) {
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34 StaticShape x_shape(input_shape);
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35 x_shape.set_width(input_shape.height());
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36 x_shape.set_height(input_shape.width());
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37 x_shape = stack_[0]->OutputShape(x_shape);
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38 x_shape.SetShape(x_shape.batch(), x_shape.width(), x_shape.height(), x_shape.depth());
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39 return x_shape;
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40 }
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41 return stack_[0]->OutputShape(input_shape);
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42 }
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44 // Takes ownership of the given network to make it the reversed one.
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45 void Reversed::SetNetwork(Network *network) {
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46 stack_.clear();
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47 AddToStack(network);
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48 }
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49
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50 // Runs forward propagation of activations on the input line.
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51 // See NetworkCpp for a detailed discussion of the arguments.
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52 void Reversed::Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
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53 NetworkScratch *scratch, NetworkIO *output) {
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54 NetworkScratch::IO rev_input(input, scratch);
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55 ReverseData(input, rev_input);
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56 NetworkScratch::IO rev_output(input, scratch);
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57 stack_[0]->Forward(debug, *rev_input, nullptr, scratch, rev_output);
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58 ReverseData(*rev_output, output);
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59 }
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61 // Runs backward propagation of errors on the deltas line.
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62 // See NetworkCpp for a detailed discussion of the arguments.
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63 bool Reversed::Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
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64 NetworkIO *back_deltas) {
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65 NetworkScratch::IO rev_input(fwd_deltas, scratch);
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66 ReverseData(fwd_deltas, rev_input);
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67 NetworkScratch::IO rev_output(fwd_deltas, scratch);
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68 if (stack_[0]->Backward(debug, *rev_input, scratch, rev_output)) {
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69 ReverseData(*rev_output, back_deltas);
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70 return true;
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71 }
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72 return false;
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73 }
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74
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75 // Copies src to *dest with the reversal according to type_.
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76 void Reversed::ReverseData(const NetworkIO &src, NetworkIO *dest) const {
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77 if (type_ == NT_XREVERSED) {
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78 dest->CopyWithXReversal(src);
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79 } else if (type_ == NT_YREVERSED) {
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80 dest->CopyWithYReversal(src);
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81 } else {
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82 dest->CopyWithXYTranspose(src);
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83 }
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84 }
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85
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86 } // namespace tesseract.