Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/lstm/functions.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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2
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: functions.h
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3 // Description: Collection of function-objects used by the network layers.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2014, 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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17
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18 #ifndef TESSERACT_LSTM_FUNCTIONS_H_
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19 #define TESSERACT_LSTM_FUNCTIONS_H_
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21 #include "helpers.h"
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22 #include "tesstypes.h"
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23
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24 // Setting this to 1 or more causes massive dumps of debug data: weights,
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25 // updates, internal calculations etc, and reduces the number of test iterations
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26 // to a small number, so outputs can be diffed.
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27 #define DEBUG_DETAIL 0
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28 #if DEBUG_DETAIL > 0
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29 # undef _OPENMP // Disable open mp to get the outputs in sync.
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30 #endif
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32 namespace tesseract {
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34 // Size of static tables.
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35 constexpr int kTableSize = 4096;
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36 // Scale factor for float arg to int index.
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37 constexpr TFloat kScaleFactor = 256.0;
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38
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39 // Generated lookup tables.
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40 extern const TFloat TanhTable[];
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41 extern const TFloat LogisticTable[];
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42
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43 // Non-linearity (sigmoid) functions with cache tables and clipping.
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44 inline TFloat Tanh(TFloat x) {
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45 if (x < 0) {
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46 return -Tanh(-x);
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47 }
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48 x *= kScaleFactor;
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49 auto index = static_cast<unsigned>(x);
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50 if (index >= (kTableSize - 1)) {
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51 return 1;
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52 }
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53 TFloat tanh_i0 = TanhTable[index];
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54 TFloat tanh_i1 = TanhTable[index + 1];
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55 // Linear interpolation.
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56 return tanh_i0 + (tanh_i1 - tanh_i0) * (x - index);
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57 }
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58
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59 inline TFloat Logistic(TFloat x) {
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60 if (x < 0) {
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61 return 1 - Logistic(-x);
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62 }
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63 x *= kScaleFactor;
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64 auto index = static_cast<unsigned>(x);
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65 if (index >= (kTableSize - 1)) {
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66 return 1;
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67 }
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68 TFloat l0 = LogisticTable[index];
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69 TFloat l1 = LogisticTable[index + 1];
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70 // Linear interpolation.
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71 return l0 + (l1 - l0) * (x - index);
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72 }
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73
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74 // Non-linearity (sigmoid) functions and their derivatives.
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75 struct FFunc {
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76 inline TFloat operator()(TFloat x) const {
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77 return Logistic(x);
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78 }
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79 };
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80 struct FPrime {
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81 inline TFloat operator()(TFloat y) const {
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82 return y * (1 - y);
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83 }
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84 };
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85 struct ClipFFunc {
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86 inline TFloat operator()(TFloat x) const {
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87 if (x <= 0) {
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88 return 0;
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89 }
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90 if (x >= 1) {
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91 return 1;
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92 }
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93 return x;
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94 }
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95 };
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96 struct ClipFPrime {
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97 inline TFloat operator()(TFloat y) const {
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98 return 0 < y && y < 1 ? 1 : 0;
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99 }
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100 };
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101 struct Relu {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 inline TFloat operator()(TFloat x) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
103 if (x <= 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
104 return 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 return x;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 };
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 struct ReluPrime {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
110 inline TFloat operator()(TFloat y) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 return 0 < y ? 1 : 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 };
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114 struct GFunc {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 inline TFloat operator()(TFloat x) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 return Tanh(x);
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parents:
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117 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
118 };
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 struct GPrime {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
120 inline TFloat operator()(TFloat y) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 return 1 - y * y;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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122 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 };
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 struct ClipGFunc {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
125 inline TFloat operator()(TFloat x) const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 if (x <= -1) {
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parents:
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127 return -1;
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parents:
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128 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
129 if (x >= 1) {
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parents:
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130 return 1;
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parents:
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131 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
132 return x;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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133 }
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parents:
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134 };
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 struct ClipGPrime {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 inline TFloat operator()(TFloat y) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 return -1 < y && y < 1 ? 1 : 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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138 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 };
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140 struct HFunc {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141 inline TFloat operator()(TFloat x) const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 return Tanh(x);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 };
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 struct HPrime {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 inline TFloat operator()(TFloat y) const {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 TFloat u = Tanh(y);
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parents:
diff changeset
148 return 1 - u * u;
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parents:
diff changeset
149 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 };
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
151 struct UnityFunc {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
152 inline TFloat operator()(TFloat /*x*/) const {
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parents:
diff changeset
153 return 1.0;
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parents:
diff changeset
154 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 };
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 struct IdentityFunc {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
157 inline TFloat operator()(TFloat x) const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 return x;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 };
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 // Applies Func in-place to inout, of size n.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 template <class Func>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 inline void FuncInplace(int n, TFloat *inout) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 Func f;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 for (int i = 0; i < n; ++i) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 inout[i] = f(inout[i]);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 // Applies Func to u and multiplies the result by v component-wise,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
171 // putting the product in out, all of size n.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 template <class Func>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 inline void FuncMultiply(const TFloat *u, const TFloat *v, int n, TFloat *out) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 Func f;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 for (int i = 0; i < n; ++i) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 out[i] = f(u[i]) * v[i];
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 // Applies the Softmax function in-place to inout, of size n.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 template <typename T>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 inline void SoftmaxInPlace(int n, T *inout) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 if (n <= 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 return;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 // A limit on the negative range input to exp to guarantee non-zero output.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 const T kMaxSoftmaxActivation = 86;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 T max_output = inout[0];
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 for (int i = 1; i < n; i++) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 T output = inout[i];
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 if (output > max_output) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 max_output = output;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 T prob_total = 0;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 for (int i = 0; i < n; i++) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197 T prob = inout[i] - max_output;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 prob = std::exp(ClipToRange(prob, -kMaxSoftmaxActivation, static_cast<T>(0)));
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 prob_total += prob;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 inout[i] = prob;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
202 if (prob_total > 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203 for (int i = 0; i < n; i++) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
204 inout[i] /= prob_total;
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205 }
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206 }
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207 }
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208
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209 // Copies n values of the given src vector to dest.
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210 inline void CopyVector(unsigned n, const TFloat *src, TFloat *dest) {
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211 memcpy(dest, src, n * sizeof(dest[0]));
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212 }
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213
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214 // Adds n values of the given src vector to dest.
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215 inline void AccumulateVector(int n, const TFloat *src, TFloat *dest) {
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216 for (int i = 0; i < n; ++i) {
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217 dest[i] += src[i];
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218 }
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219 }
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220
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221 // Multiplies n values of inout in-place element-wise by the given src vector.
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222 inline void MultiplyVectorsInPlace(int n, const TFloat *src, TFloat *inout) {
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223 for (int i = 0; i < n; ++i) {
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224 inout[i] *= src[i];
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225 }
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226 }
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227
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228 // Multiplies n values of u by v, element-wise, accumulating to out.
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229 inline void MultiplyAccumulate(int n, const TFloat *u, const TFloat *v, TFloat *out) {
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230 for (int i = 0; i < n; i++) {
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231 out[i] += u[i] * v[i];
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232 }
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233 }
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234
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235 // Sums the given 5 n-vectors putting the result into sum.
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236 inline void SumVectors(int n, const TFloat *v1, const TFloat *v2, const TFloat *v3,
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237 const TFloat *v4, const TFloat *v5, TFloat *sum) {
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238 for (int i = 0; i < n; ++i) {
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239 sum[i] = v1[i] + v2[i] + v3[i] + v4[i] + v5[i];
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240 }
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241 }
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242
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243 // Sets the given n-vector vec to 0.
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244 template <typename T>
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245 inline void ZeroVector(unsigned n, T *vec) {
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246 memset(vec, 0, n * sizeof(*vec));
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247 }
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248
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249 // Clips the given vector vec, of size n to [lower, upper].
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250 template <typename T>
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251 inline void ClipVector(int n, T lower, T upper, T *vec) {
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252 for (int i = 0; i < n; ++i) {
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253 vec[i] = ClipToRange(vec[i], lower, upper);
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254 }
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255 }
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256
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257 // Converts the given n-vector to a binary encoding of the maximum value,
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258 // encoded as vector of nf binary values.
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259 inline void CodeInBinary(int n, int nf, TFloat *vec) {
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260 if (nf <= 0 || n < nf) {
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261 return;
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262 }
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263 int index = 0;
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264 TFloat best_score = vec[0];
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265 for (int i = 1; i < n; ++i) {
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266 if (vec[i] > best_score) {
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267 best_score = vec[i];
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268 index = i;
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269 }
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270 }
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271 int mask = 1;
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272 for (int i = 0; i < nf; ++i, mask *= 2) {
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273 vec[i] = (index & mask) ? 1.0 : 0.0;
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274 }
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275 }
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276
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277 } // namespace tesseract.
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278
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279 #endif // TESSERACT_LSTM_FUNCTIONS_H_