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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
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: parallel.h
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3 // Description: Runs networks in parallel on the same input.
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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_PARALLEL_H_
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19 #define TESSERACT_LSTM_PARALLEL_H_
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21 #include "plumbing.h"
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23 namespace tesseract {
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25 // Runs multiple networks in parallel, interlacing their outputs.
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26 class Parallel : public Plumbing {
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27 public:
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28 // ni_ and no_ will be set by AddToStack.
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29 TESS_API
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30 Parallel(const std::string &name, NetworkType type);
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32 // Returns the shape output from the network given an input shape (which may
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33 // be partially unknown ie zero).
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34 StaticShape OutputShape(const StaticShape &input_shape) const override;
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36 std::string spec() const override {
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37 std::string spec;
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38 if (type_ == NT_PAR_2D_LSTM) {
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39 // We have 4 LSTMs operating in parallel here, so the size of each is
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40 // the number of outputs/4.
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41 spec += "L2xy" + std::to_string(no_ / 4);
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42 } else if (type_ == NT_PAR_RL_LSTM) {
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43 // We have 2 LSTMs operating in parallel here, so the size of each is
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44 // the number of outputs/2.
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45 if (stack_[0]->type() == NT_LSTM_SUMMARY) {
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46 spec += "Lbxs" + std::to_string(no_ / 2);
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47 } else {
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48 spec += "Lbx" + std::to_string(no_ / 2);
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49 }
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50 } else {
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51 if (type_ == NT_REPLICATED) {
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52 spec += "R" + std::to_string(stack_.size()) + "(" + stack_[0]->spec();
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53 } else {
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54 for (auto &it : stack_) {
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55 spec += it->spec();
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56 }
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57 }
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58 spec += ")";
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59 }
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60 return spec;
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61 }
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62
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63 // Runs forward propagation of activations on the input line.
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64 // See Network for a detailed discussion of the arguments.
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65 void Forward(bool debug, const NetworkIO &input, const TransposedArray *input_transpose,
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66 NetworkScratch *scratch, NetworkIO *output) override;
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67
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68 // Runs backward propagation of errors on the deltas line.
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69 // See Network for a detailed discussion of the arguments.
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70 bool Backward(bool debug, const NetworkIO &fwd_deltas, NetworkScratch *scratch,
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71 NetworkIO *back_deltas) override;
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72
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73 private:
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74 // If *this is a NT_REPLICATED, then it feeds a replicated network with
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75 // identical inputs, and it would be extremely wasteful for them to each
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76 // calculate and store the same transpose of the inputs, so Parallel does it
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77 // and passes a pointer to the replicated network, allowing it to use the
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78 // transpose on the next call to Backward.
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79 TransposedArray transposed_input_;
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80 };
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81
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82 } // namespace tesseract.
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83
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84 #endif // TESSERACT_LSTM_PARALLEL_H_