Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/lstm/reconfig.h @ 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.h
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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 #ifndef TESSERACT_LSTM_RECONFIG_H_
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20 #define TESSERACT_LSTM_RECONFIG_H_
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22 #include "matrix.h"
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23 #include "network.h"
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25 namespace tesseract {
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27 // Reconfigures (Shrinks) the inputs by concatenating an x_scale by y_scale tile
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28 // of inputs together, producing a single, deeper output per tile.
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29 // Note that fractional parts are truncated for efficiency, so make sure the
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30 // input stride is a multiple of the y_scale factor!
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31 class Reconfig : public Network {
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32 public:
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33 TESS_API
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34 Reconfig(const std::string &name, int ni, int x_scale, int y_scale);
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35 ~Reconfig() override = default;
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37 // Returns the shape output from the network given an input shape (which may
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38 // be partially unknown ie zero).
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39 StaticShape OutputShape(const StaticShape &input_shape) const override;
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41 std::string spec() const override {
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42 return "S" + std::to_string(y_scale_) + "," + std::to_string(x_scale_);
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43 }
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45 // Returns an integer reduction factor that the network applies to the
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46 // time sequence. Assumes that any 2-d is already eliminated. Used for
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47 // scaling bounding boxes of truth data.
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48 // WARNING: if GlobalMinimax is used to vary the scale, this will return
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49 // the last used scale factor. Call it before any forward, and it will return
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50 // the minimum scale factor of the paths through the GlobalMinimax.
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51 int XScaleFactor() const override;
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53 // Writes to the given file. Returns false in case of error.
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54 bool Serialize(TFile *fp) const override;
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55 // Reads from the given file. Returns false in case of error.
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56 bool DeSerialize(TFile *fp) override;
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58 // Runs forward propagation of activations on the input line.
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59 // See Network for a detailed discussion of the arguments.
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60 void Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
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61 NetworkScratch *scratch, NetworkIO *output) override;
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63 // Runs backward propagation of errors on the deltas line.
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64 // See Network for a detailed discussion of the arguments.
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65 bool Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
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66 NetworkIO *back_deltas) override;
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68 private:
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69 void DebugWeights() override {
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70 tprintf("Must override Network::DebugWeights for type %d\n", type_);
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71 }
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73 protected:
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74 // Non-serialized data used to store parameters between forward and back.
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75 StrideMap back_map_;
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76 // Serialized data.
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77 int32_t x_scale_;
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78 int32_t y_scale_;
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79 };
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80
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81 } // namespace tesseract.
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82
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83 #endif // TESSERACT_LSTM_SUBSAMPLE_H_