Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/lstm/reversed.h @ 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:
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: reversed.h
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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 #ifndef TESSERACT_LSTM_REVERSED_H_
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19 #define TESSERACT_LSTM_REVERSED_H_
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21 #include "matrix.h"
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22 #include "plumbing.h"
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24 namespace tesseract {
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26 // C++ Implementation of the Reversed class from lstm.py.
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27 class Reversed : public Plumbing {
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28 public:
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29 TESS_API
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30 explicit Reversed(const std::string &name, NetworkType type);
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31 ~Reversed() override = default;
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32
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33 // Returns the shape output from the network given an input shape (which may
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34 // be partially unknown ie zero).
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35 StaticShape OutputShape(const StaticShape &input_shape) const override;
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37 std::string spec() const override {
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38 std::string spec(type_ == NT_XREVERSED ? "Rx" : (type_ == NT_YREVERSED ? "Ry" : "Txy"));
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39 // For most simple cases, we will output Rx<net> or Ry<net> where <net> is
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40 // the network in stack_[0], but in the special case that <net> is an
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41 // LSTM, we will just output the LSTM's spec modified to take the reversal
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42 // into account. This is because when the user specified Lfy64, we actually
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43 // generated TxyLfx64, and if the user specified Lrx64 we actually
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44 // generated RxLfx64, and we want to display what the user asked for.
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45 std::string net_spec(stack_[0]->spec());
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46 if (net_spec[0] == 'L') {
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47 // Setup a from and to character according to the type of the reversal
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48 // such that the LSTM spec gets modified to the spec that the user
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49 // asked for
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50 char from = 'f';
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51 char to = 'r';
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52 if (type_ == NT_XYTRANSPOSE) {
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53 from = 'x';
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54 to = 'y';
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55 }
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56 // Change the from char to the to char.
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57 for (auto &it : net_spec) {
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58 if (it == from) {
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59 it = to;
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60 }
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61 }
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62 spec += net_spec;
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63 return spec;
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64 }
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65 spec += net_spec;
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66 return spec;
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67 }
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68
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69 // Takes ownership of the given network to make it the reversed one.
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70 TESS_API
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71 void SetNetwork(Network *network);
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72
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73 // Runs forward propagation of activations on the input line.
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74 // See Network for a detailed discussion of the arguments.
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75 void Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
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76 NetworkScratch *scratch, NetworkIO *output) override;
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77
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78 // Runs backward propagation of errors on the deltas line.
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79 // See Network for a detailed discussion of the arguments.
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80 bool Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
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81 NetworkIO *back_deltas) override;
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82
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83 private:
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84 // Copies src to *dest with the reversal according to type_.
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85 void ReverseData(const NetworkIO &src, NetworkIO *dest) const;
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86 };
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87
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88 } // namespace tesseract.
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89
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90 #endif // TESSERACT_LSTM_REVERSED_H_