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comparison mupdf-source/thirdparty/tesseract/src/lstm/reconfig.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 ///////////////////////////////////////////////////////////////////////
2 // File: reconfig.h
3 // Description: Network layer that reconfigures the scaling vs feature
4 // depth.
5 // Author: Ray Smith
6 //
7 // (C) Copyright 2014, Google Inc.
8 // Licensed under the Apache License, Version 2.0 (the "License");
9 // you may not use this file except in compliance with the License.
10 // You may obtain a copy of the License at
11 // http://www.apache.org/licenses/LICENSE-2.0
12 // Unless required by applicable law or agreed to in writing, software
13 // distributed under the License is distributed on an "AS IS" BASIS,
14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 // See the License for the specific language governing permissions and
16 // limitations under the License.
17 ///////////////////////////////////////////////////////////////////////
18
19 #ifndef TESSERACT_LSTM_RECONFIG_H_
20 #define TESSERACT_LSTM_RECONFIG_H_
21
22 #include "matrix.h"
23 #include "network.h"
24
25 namespace tesseract {
26
27 // Reconfigures (Shrinks) the inputs by concatenating an x_scale by y_scale tile
28 // of inputs together, producing a single, deeper output per tile.
29 // Note that fractional parts are truncated for efficiency, so make sure the
30 // input stride is a multiple of the y_scale factor!
31 class Reconfig : public Network {
32 public:
33 TESS_API
34 Reconfig(const std::string &name, int ni, int x_scale, int y_scale);
35 ~Reconfig() override = default;
36
37 // Returns the shape output from the network given an input shape (which may
38 // be partially unknown ie zero).
39 StaticShape OutputShape(const StaticShape &input_shape) const override;
40
41 std::string spec() const override {
42 return "S" + std::to_string(y_scale_) + "," + std::to_string(x_scale_);
43 }
44
45 // Returns an integer reduction factor that the network applies to the
46 // time sequence. Assumes that any 2-d is already eliminated. Used for
47 // scaling bounding boxes of truth data.
48 // WARNING: if GlobalMinimax is used to vary the scale, this will return
49 // the last used scale factor. Call it before any forward, and it will return
50 // the minimum scale factor of the paths through the GlobalMinimax.
51 int XScaleFactor() const override;
52
53 // Writes to the given file. Returns false in case of error.
54 bool Serialize(TFile *fp) const override;
55 // Reads from the given file. Returns false in case of error.
56 bool DeSerialize(TFile *fp) override;
57
58 // Runs forward propagation of activations on the input line.
59 // See Network for a detailed discussion of the arguments.
60 void Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
61 NetworkScratch *scratch, NetworkIO *output) override;
62
63 // Runs backward propagation of errors on the deltas line.
64 // See Network for a detailed discussion of the arguments.
65 bool Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
66 NetworkIO *back_deltas) override;
67
68 private:
69 void DebugWeights() override {
70 tprintf("Must override Network::DebugWeights for type %d\n", type_);
71 }
72
73 protected:
74 // Non-serialized data used to store parameters between forward and back.
75 StrideMap back_map_;
76 // Serialized data.
77 int32_t x_scale_;
78 int32_t y_scale_;
79 };
80
81 } // namespace tesseract.
82
83 #endif // TESSERACT_LSTM_SUBSAMPLE_H_