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annotate mupdf-source/thirdparty/tesseract/src/training/unicharset/lang_model_helpers.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 // Copyright 2017 Google Inc. All Rights Reserved.
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2 // Author: rays@google.com (Ray Smith)
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3 // Purpose: Collection of convenience functions to simplify creation of the
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4 // unicharset, recoder, and dawgs for an LSTM model.
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6 // Licensed under the Apache License, Version 2.0 (the "License");
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7 // you may not use this file except in compliance with the License.
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8 // You may obtain a copy of the License at
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9 // http://www.apache.org/licenses/LICENSE-2.0
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10 // Unless required by applicable law or agreed to in writing, software
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11 // distributed under the License is distributed on an "AS IS" BASIS,
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12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 // See the License for the specific language governing permissions and
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14 // limitations under the License.
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15 #ifndef TESSERACT_TRAINING_LANG_MODEL_HELPERS_H_
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16 #define TESSERACT_TRAINING_LANG_MODEL_HELPERS_H_
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18 #include "export.h"
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20 #include "serialis.h"
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21 #include "tessdatamanager.h"
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22 #include "unicharset.h"
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24 #include <string>
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26 namespace tesseract {
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28 // Helper makes a filename (<output_dir>/<lang>/<lang><suffix>) and writes data
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29 // to the file, using writer if not null, otherwise, a default writer.
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30 // Default writer will overwrite any existing file, but a supplied writer
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31 // can do its own thing. If lang is empty, returns true but does nothing.
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32 // NOTE that suffix should contain any required . for the filename.
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33 TESS_UNICHARSET_TRAINING_API
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34 bool WriteFile(const std::string &output_dir, const std::string &lang, const std::string &suffix,
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35 const std::vector<char> &data, FileWriter writer);
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36 // Helper reads a file with optional reader and returns a string.
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37 // On failure emits a warning message and returns and empty string.
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38 TESS_UNICHARSET_TRAINING_API
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39 std::string ReadFile(const std::string &filename, FileReader reader = nullptr);
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41 // Helper writes the unicharset to file and to the traineddata.
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42 bool WriteUnicharset(const UNICHARSET &unicharset, const std::string &output_dir,
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43 const std::string &lang, FileWriter writer, TessdataManager *traineddata);
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44 // Helper creates the recoder from the unicharset and writes it to the
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45 // traineddata, with a human-readable form to file at:
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46 // <output_dir>/<lang>/<lang>.charset_size=<num> for some num being the size
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47 // of the re-encoded character set. The charset_size file is written using
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48 // writer if not null, or using a default file writer otherwise, overwriting
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49 // any existing content.
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50 // If pass_through is true, then the recoder will be a no-op, passing the
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51 // unicharset codes through unchanged. Otherwise, the recoder will "compress"
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52 // the unicharset by encoding Hangul in Jamos, decomposing multi-unicode
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53 // symbols into sequences of unicodes, and encoding Han using the data in the
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54 // radical_table_data, which must be the content of the file:
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55 // langdata/radical-stroke.txt.
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56 bool WriteRecoder(const UNICHARSET &unicharset, bool pass_through, const std::string &output_dir,
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57 const std::string &lang, FileWriter writer, std::string *radical_table_data,
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58 TessdataManager *traineddata);
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60 // The main function for combine_lang_model.cpp.
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61 // Returns EXIT_SUCCESS or EXIT_FAILURE for error.
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62 // unicharset: can be a hand-created file with incomplete fields. Its basic
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63 // and script properties will be set before it is used.
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64 // script_dir: should point to the langdata (github repo) directory.
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65 // version_str: arbitrary version label.
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66 // Output files will be written to <output_dir>/<lang>/<lang>.*
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67 // If pass_through_recoder is true, the unicharset will be used unchanged as
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68 // labels in the classifier, otherwise, the unicharset will be "compressed" to
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69 // make the recognition task simpler and faster.
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70 // The words/puncs/numbers lists may be all empty. If any are non-empty then
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71 // puncs must be non-empty.
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72 // lang_is_rtl indicates that the language is generally written from right
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73 // to left (eg Arabic/Hebrew).
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74 TESS_UNICHARSET_TRAINING_API
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75 int CombineLangModel(const UNICHARSET &unicharset, const std::string &script_dir,
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76 const std::string &version_str, const std::string &output_dir,
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77 const std::string &lang, bool pass_through_recoder,
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78 const std::vector<std::string> &words, const std::vector<std::string> &puncs,
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79 const std::vector<std::string> &numbers, bool lang_is_rtl, FileReader reader,
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80 FileWriter writer);
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81
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82 } // namespace tesseract
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84 #endif // TESSERACT_TRAINING_LANG_MODEL_HELPERS_H_