Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/unicharset/lstmtester.cpp @ 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: lstmtester.cpp
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3 // Description: Top-level line evaluation class for LSTM-based networks.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2016, 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 "lstmtester.h"
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19 #include <iomanip> // for std::setprecision
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20 #include <thread> // for std::thread
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21 #include "fileio.h" // for LoadFileLinesToStrings
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23 namespace tesseract {
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25 LSTMTester::LSTMTester(int64_t max_memory) : test_data_(max_memory) {}
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27 // Loads a set of lstmf files that were created using the lstm.train config to
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28 // tesseract into memory ready for testing. Returns false if nothing was
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29 // loaded. The arg is a filename of a file that lists the filenames.
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30 bool LSTMTester::LoadAllEvalData(const char *filenames_file) {
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31 std::vector<std::string> filenames;
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32 if (!LoadFileLinesToStrings(filenames_file, &filenames)) {
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33 tprintf("Failed to load list of eval filenames from %s\n", filenames_file);
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34 return false;
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35 }
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36 return LoadAllEvalData(filenames);
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37 }
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38
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39 // Loads a set of lstmf files that were created using the lstm.train config to
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40 // tesseract into memory ready for testing. Returns false if nothing was
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41 // loaded.
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42 bool LSTMTester::LoadAllEvalData(const std::vector<std::string> &filenames) {
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43 test_data_.Clear();
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44 bool result = test_data_.LoadDocuments(filenames, CS_SEQUENTIAL, nullptr);
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45 total_pages_ = test_data_.TotalPages();
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46 return result;
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47 }
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48
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49 // Runs an evaluation asynchronously on the stored data and returns a string
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50 // describing the results of the previous test.
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51 std::string LSTMTester::RunEvalAsync(int iteration, const double *training_errors,
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52 const TessdataManager &model_mgr, int training_stage) {
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53 std::string result;
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54 if (total_pages_ == 0) {
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55 result += "No test data at iteration " + std::to_string(iteration);
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56 return result;
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57 }
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58 if (!LockIfNotRunning()) {
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59 result += "Previous test incomplete, skipping test at iteration " + std::to_string(iteration);
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60 return result;
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61 }
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62 // Save the args.
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63 std::string prev_result = test_result_;
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64 test_result_ = "";
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65 if (training_errors != nullptr) {
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66 test_iteration_ = iteration;
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67 test_training_errors_ = training_errors;
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68 test_model_mgr_ = model_mgr;
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69 test_training_stage_ = training_stage;
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70 std::thread t(&LSTMTester::ThreadFunc, this);
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71 t.detach();
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72 } else {
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73 UnlockRunning();
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74 }
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75 return prev_result;
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76 }
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77
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78 // Runs an evaluation synchronously on the stored data and returns a string
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79 // describing the results.
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80 std::string LSTMTester::RunEvalSync(int iteration, const double *training_errors,
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81 const TessdataManager &model_mgr, int training_stage,
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82 int verbosity) {
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83 LSTMTrainer trainer;
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84 trainer.InitCharSet(model_mgr);
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85 TFile fp;
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86 if (!model_mgr.GetComponent(TESSDATA_LSTM, &fp) || !trainer.DeSerialize(&model_mgr, &fp)) {
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87 return "Deserialize failed";
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88 }
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89 int eval_iteration = 0;
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90 double char_error = 0.0;
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91 double word_error = 0.0;
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92 int error_count = 0;
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93 while (error_count < total_pages_) {
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94 const ImageData *trainingdata = test_data_.GetPageBySerial(eval_iteration);
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95 trainer.SetIteration(++eval_iteration);
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96 NetworkIO fwd_outputs, targets;
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97 Trainability result = trainer.PrepareForBackward(trainingdata, &fwd_outputs, &targets);
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98 if (result != UNENCODABLE) {
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99 char_error += trainer.NewSingleError(tesseract::ET_CHAR_ERROR);
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100 word_error += trainer.NewSingleError(tesseract::ET_WORD_RECERR);
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101 ++error_count;
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102 if (verbosity > 1 || (verbosity > 0 && result != PERFECT)) {
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103 tprintf("Truth:%s\n", trainingdata->transcription().c_str());
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104 std::vector<int> ocr_labels;
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105 std::vector<int> xcoords;
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106 trainer.LabelsFromOutputs(fwd_outputs, &ocr_labels, &xcoords);
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107 std::string ocr_text = trainer.DecodeLabels(ocr_labels);
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108 tprintf("OCR :%s\n", ocr_text.c_str());
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109 if (verbosity > 2 || (verbosity > 1 && result != PERFECT)) {
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110 tprintf("Line BCER=%f, BWER=%f\n\n",
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111 trainer.NewSingleError(tesseract::ET_CHAR_ERROR),
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112 trainer.NewSingleError(tesseract::ET_WORD_RECERR));
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113 }
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114 }
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115 }
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116 }
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117 char_error *= 100.0 / total_pages_;
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118 word_error *= 100.0 / total_pages_;
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119 std::stringstream result;
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120 result.imbue(std::locale::classic());
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121 result << std::fixed << std::setprecision(3);
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122 if (iteration != 0 || training_stage != 0) {
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123 result << "At iteration " << iteration
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124 << ", stage " << training_stage << ", ";
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125 }
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126 result << "BCER eval=" << char_error << ", BWER eval=" << word_error;
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127 return result.str();
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128 }
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129
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130 // Helper thread function for RunEvalAsync.
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131 // LockIfNotRunning must have returned true before calling ThreadFunc, and
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132 // it will call UnlockRunning to release the lock after RunEvalSync completes.
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133 void LSTMTester::ThreadFunc() {
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134 test_result_ =
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135 RunEvalSync(test_iteration_, test_training_errors_, test_model_mgr_, test_training_stage_,
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136 /*verbosity*/ 0);
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137 UnlockRunning();
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138 }
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139
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140 // Returns true if there is currently nothing running, and takes the lock
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141 // if there is nothing running.
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142 bool LSTMTester::LockIfNotRunning() {
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143 std::lock_guard<std::mutex> lock(running_mutex_);
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144 if (async_running_) {
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145 return false;
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146 }
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147 async_running_ = true;
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148 return true;
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149 }
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150
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151 // Releases the running lock.
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152 void LSTMTester::UnlockRunning() {
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153 std::lock_guard<std::mutex> lock(running_mutex_);
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154 async_running_ = false;
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155 }
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156
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157 } // namespace tesseract