1 | /**
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2 | * @license
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3 | * Copyright 2018 Google LLC
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4 | *
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5 | * Use of this source code is governed by an MIT-style
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6 | * license that can be found in the LICENSE file or at
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7 | * https://opensource.org/licenses/MIT.
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8 | * =============================================================================
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9 | */
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10 | /**
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11 | * Layers that augment the functionality of a base layer.
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12 | */
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13 | import * as tfc from '@tensorflow/tfjs-core';
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14 | import { serialization, tidy } from '@tensorflow/tfjs-core';
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15 | import * as K from '../backend/tfjs_backend';
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16 | import { nameScope } from '../common';
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17 | import { InputSpec, Layer, SymbolicTensor } from '../engine/topology';
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18 | import { NotImplementedError, ValueError } from '../errors';
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19 | import { VALID_BIDIRECTIONAL_MERGE_MODES } from '../keras_format/common';
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20 | import * as generic_utils from '../utils/generic_utils';
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21 | import { getExactlyOneShape, getExactlyOneTensor } from '../utils/types_utils';
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22 | import { rnn, standardizeArgs } from './recurrent';
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23 | import { deserialize } from './serialization';
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24 | /**
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25 | * Abstract wrapper base class.
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26 | *
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27 | * Wrappers take another layer and augment it in various ways.
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28 | * Do not use this class as a layer, it is only an abstract base class.
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29 | * Two usable wrappers are the `TimeDistributed` and `Bidirectional` wrappers.
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30 | */
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31 | export class Wrapper extends Layer {
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32 | constructor(args) {
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33 | // Porting Note: In PyKeras, `self.layer` is set prior to the calling
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34 | // `super()`. But we can't do that here due to TypeScript's restriction.
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35 | // See: https://github.com/Microsoft/TypeScript/issues/8277
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36 | // As a result, we have to add checks in `get trainable()` and
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37 | // `set trainable()` below in order to prevent using `this.layer` when
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38 | // its value is `undefined`. The super constructor does use the getter
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39 | // and the setter of `this.layer`.
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40 | super(args);
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41 | this.layer = args.layer;
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42 | }
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43 | build(inputShape) {
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44 | this.built = true;
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45 | }
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46 | // TODO(cais): Implement activityRegularizer getter.
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47 | get trainable() {
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48 | // Porting Note: the check of `this.layer` here is necessary due to the
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49 | // way the `constructor` of this class is written (see Porting Note
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50 | // above).
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51 | if (this.layer != null) {
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52 | return this.layer.trainable;
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53 | }
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54 | else {
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55 | return false;
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56 | }
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57 | }
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58 | set trainable(value) {
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59 | // Porting Note: the check of `this.layer` here is necessary due to the
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60 | // way the `constructor` of this class is written (see Porting Note
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61 | // above).
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62 | if (this.layer != null) {
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63 | this.layer.trainable = value;
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64 | }
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65 | }
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66 | get trainableWeights() {
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67 | return this.layer.trainableWeights;
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68 | }
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69 | // TODO(cais): Implement setter for trainableWeights.
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70 | get nonTrainableWeights() {
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71 | return this.layer.nonTrainableWeights;
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72 | }
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73 | // TODO(cais): Implement setter for nonTrainableWeights.
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74 | get updates() {
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75 | // tslint:disable-next-line:no-any
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76 | return this.layer._updates;
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77 | }
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78 | // TODO(cais): Implement getUpdatesFor().
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79 | get losses() {
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80 | return this.layer.losses;
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81 | }
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82 | // TODO(cais): Implement getLossesFor().
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83 | getWeights() {
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84 | return this.layer.getWeights();
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85 | }
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86 | setWeights(weights) {
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87 | this.layer.setWeights(weights);
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88 | }
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89 | getConfig() {
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90 | const config = {
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91 | 'layer': {
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92 | 'className': this.layer.getClassName(),
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93 | 'config': this.layer.getConfig(),
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94 | }
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95 | };
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96 | const baseConfig = super.getConfig();
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97 | Object.assign(config, baseConfig);
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98 | return config;
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99 | }
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100 | setFastWeightInitDuringBuild(value) {
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101 | super.setFastWeightInitDuringBuild(value);
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102 | if (this.layer != null) {
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103 | this.layer.setFastWeightInitDuringBuild(value);
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104 | }
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105 | }
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106 | /** @nocollapse */
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107 | static fromConfig(cls, config, customObjects = {}) {
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108 | const layerConfig = config['layer'];
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109 | const layer = deserialize(layerConfig, customObjects);
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110 | delete config['layer'];
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111 | const newConfig = { layer };
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112 | Object.assign(newConfig, config);
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113 | return new cls(newConfig);
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114 | }
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115 | }
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116 | export class TimeDistributed extends Wrapper {
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117 | constructor(args) {
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118 | super(args);
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119 | this.supportsMasking = true;
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120 | }
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121 | build(inputShape) {
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122 | inputShape = getExactlyOneShape(inputShape);
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123 | if (inputShape.length < 3) {
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124 | throw new ValueError(`TimeDistributed layer expects an input shape >= 3D, but received ` +
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125 | `input shape ${JSON.stringify(inputShape)}`);
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126 | }
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127 | this.inputSpec = [{ shape: inputShape }];
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128 | const childInputShape = [inputShape[0]].concat(inputShape.slice(2));
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129 | if (!this.layer.built) {
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130 | this.layer.build(childInputShape);
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131 | this.layer.built = true;
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132 | }
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133 | super.build(inputShape);
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134 | }
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135 | computeOutputShape(inputShape) {
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136 | inputShape = getExactlyOneShape(inputShape);
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137 | const childInputShape = [inputShape[0]].concat(inputShape.slice(2));
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138 | const childOutputShape = this.layer.computeOutputShape(childInputShape);
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139 | const timesteps = inputShape[1];
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140 | return [childOutputShape[0], timesteps].concat(childOutputShape.slice(1));
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141 | }
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142 | call(inputs, kwargs) {
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143 | return tidy(() => {
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144 | // TODO(cais): Add 'training' and 'useLearningPhase' to kwargs.
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145 | inputs = getExactlyOneTensor(inputs);
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146 | // Porting Note: In tfjs-layers, `inputs` are always concrete tensor
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147 | // values. Hence the inputs can't have an undetermined first (batch)
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148 | // dimension, which is why we always use the K.rnn approach here.
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149 | const step = (inputs, states) => {
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150 | // TODO(cais): Add useLearningPhase.
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151 | // NOTE(cais): `layer.call` may return a length-1 array of Tensor in
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152 | // some cases (e.g., `layer` is a `Sequential` instance), which is
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153 | // why `getExactlyOneTensor` is used below.
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154 | const output = getExactlyOneTensor(this.layer.call(inputs, kwargs));
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155 | return [output, []];
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156 | };
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157 | const rnnOutputs = rnn(step, inputs, [], false /* goBackwards */, null /* mask */, null /* constants */, false /* unroll */, true /* needPerStepOutputs */);
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158 | const y = rnnOutputs[1];
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159 | // TODO(cais): Add activity regularization.
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160 | // TODO(cais): Add useLearningPhase.
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161 | return y;
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162 | });
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163 | }
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164 | }
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165 | /** @nocollapse */
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166 | TimeDistributed.className = 'TimeDistributed';
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167 | serialization.registerClass(TimeDistributed);
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168 | export function checkBidirectionalMergeMode(value) {
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169 | generic_utils.checkStringTypeUnionValue(VALID_BIDIRECTIONAL_MERGE_MODES, 'BidirectionalMergeMode', value);
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170 | }
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171 | const DEFAULT_BIDIRECTIONAL_MERGE_MODE = 'concat';
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172 | export class Bidirectional extends Wrapper {
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173 | constructor(args) {
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174 | super(args);
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175 | // Note: When creating `this.forwardLayer`, the original Layer object
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176 | // (`config.layer`) ought to be cloned. This is why we call
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177 | // `getConfig()` followed by `deserialize()`. Without this cloning,
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178 | // the layer names saved during serialization will incorrectly contain
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179 | // the 'forward_' prefix. In Python Keras, this is done using
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180 | // `copy.copy` (shallow copy), which does not have a simple equivalent
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181 | // in JavaScript. JavaScript's `Object.assign()` does not copy
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182 | // methods.
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183 | const layerConfig = args.layer.getConfig();
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184 | const forwDict = {};
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185 | forwDict['className'] = args.layer.getClassName();
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186 | forwDict['config'] = layerConfig;
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187 | this.forwardLayer = deserialize(forwDict);
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188 | layerConfig['goBackwards'] =
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189 | layerConfig['goBackwards'] === true ? false : true;
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190 | const backDict = {};
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191 | backDict['className'] = args.layer.getClassName();
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192 | backDict['config'] = layerConfig;
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193 | this.backwardLayer = deserialize(backDict);
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194 | this.forwardLayer.name = 'forward_' + this.forwardLayer.name;
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195 | this.backwardLayer.name = 'backward_' + this.backwardLayer.name;
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196 | this.mergeMode = args.mergeMode === undefined ?
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197 | DEFAULT_BIDIRECTIONAL_MERGE_MODE :
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198 | args.mergeMode;
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199 | checkBidirectionalMergeMode(this.mergeMode);
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200 | if (args.weights) {
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201 | throw new NotImplementedError('weights support is not implemented for Bidirectional layer yet.');
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202 | }
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203 | this._stateful = args.layer.stateful;
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204 | this.returnSequences = args.layer.returnSequences;
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205 | this.returnState = args.layer.returnState;
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206 | this.supportsMasking = true;
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207 | this._trainable = true;
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208 | this.inputSpec = args.layer.inputSpec;
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209 | this.numConstants = null;
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210 | }
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211 | get trainable() {
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212 | return this._trainable;
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213 | }
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214 | set trainable(value) {
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215 | // Porting Note: the check of `this.layer` here is necessary due to the
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216 | // way the `constructor` of this class is written (see Porting Note
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217 | // above).
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218 | this._trainable = value;
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219 | if (this.forwardLayer != null) {
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220 | this.forwardLayer.trainable = value;
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221 | }
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222 | if (this.backwardLayer != null) {
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223 | this.backwardLayer.trainable = value;
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224 | }
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225 | }
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226 | getWeights() {
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227 | return this.forwardLayer.getWeights().concat(this.backwardLayer.getWeights());
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228 | }
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229 | setWeights(weights) {
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230 | const numWeights = weights.length;
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231 | const numeightsOver2 = Math.floor(numWeights / 2);
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232 | this.forwardLayer.setWeights(weights.slice(0, numeightsOver2));
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233 | this.backwardLayer.setWeights(weights.slice(numeightsOver2));
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234 | }
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235 | computeOutputShape(inputShape) {
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236 | let layerShapes = this.forwardLayer.computeOutputShape(inputShape);
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237 | if (!(Array.isArray(layerShapes) && Array.isArray(layerShapes[0]))) {
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238 | layerShapes = [layerShapes];
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239 | }
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240 | layerShapes = layerShapes;
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241 | let outputShape;
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242 | let outputShapes;
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243 | let stateShape;
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244 | if (this.returnState) {
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245 | stateShape = layerShapes.slice(1);
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246 | outputShape = layerShapes[0];
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247 | }
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248 | else {
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249 | outputShape = layerShapes[0];
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250 | }
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251 | outputShape = outputShape;
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252 | if (this.mergeMode === 'concat') {
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253 | outputShape[outputShape.length - 1] *= 2;
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254 | outputShapes = [outputShape];
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255 | }
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256 | else if (this.mergeMode == null) {
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257 | outputShapes = [outputShape, outputShape.slice()];
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258 | }
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259 | else {
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260 | outputShapes = [outputShape];
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261 | }
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262 | if (this.returnState) {
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263 | if (this.mergeMode == null) {
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264 | return outputShapes.concat(stateShape).concat(stateShape.slice());
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265 | }
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266 | return [outputShape].concat(stateShape).concat(stateShape.slice());
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267 | }
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268 | return generic_utils.singletonOrArray(outputShapes);
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269 | }
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270 | apply(inputs, kwargs) {
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271 | let initialState = kwargs == null ? null : kwargs['initialState'];
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272 | let constants = kwargs == null ? null : kwargs['constants'];
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273 | if (kwargs == null) {
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274 | kwargs = {};
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275 | }
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276 | const standardized = standardizeArgs(inputs, initialState, constants, this.numConstants);
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277 | inputs = standardized.inputs;
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278 | initialState = standardized.initialState;
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279 | constants = standardized.constants;
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280 | if (Array.isArray(inputs)) {
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281 | initialState = inputs.slice(1);
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282 | inputs = inputs[0];
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283 | }
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284 | if ((initialState == null || initialState.length === 0) &&
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285 | constants == null) {
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286 | return super.apply(inputs, kwargs);
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287 | }
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288 | const additionalInputs = [];
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289 | const additionalSpecs = [];
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290 | if (initialState != null) {
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291 | const numStates = initialState.length;
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292 | if (numStates % 2 > 0) {
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293 | throw new ValueError('When passing `initialState` to a Bidrectional RNN, ' +
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294 | 'the state should be an Array containing the states of ' +
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295 | 'the underlying RNNs.');
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296 | }
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297 | kwargs['initialState'] = initialState;
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298 | additionalInputs.push(...initialState);
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299 | const stateSpecs = initialState
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300 | .map(state => new InputSpec({ shape: state.shape }));
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301 | this.forwardLayer.stateSpec = stateSpecs.slice(0, numStates / 2);
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302 | this.backwardLayer.stateSpec = stateSpecs.slice(numStates / 2);
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303 | additionalSpecs.push(...stateSpecs);
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304 | }
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305 | if (constants != null) {
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306 | throw new NotImplementedError('Support for constants in Bidirectional layers is not ' +
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307 | 'implemented yet.');
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308 | }
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309 | const isSymbolicTensor = additionalInputs[0] instanceof SymbolicTensor;
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310 | for (const tensor of additionalInputs) {
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311 | if (tensor instanceof SymbolicTensor !== isSymbolicTensor) {
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312 | throw new ValueError('The initial state of a Bidirectional layer cannot be ' +
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313 | 'specified as a mix of symbolic and non-symbolic tensors');
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314 | }
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315 | }
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316 | if (isSymbolicTensor) {
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317 | // Compute the full input and specs, including the states.
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318 | const fullInput = [inputs].concat(additionalInputs);
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319 | const fullInputSpec = this.inputSpec.concat(additionalSpecs);
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320 | // Perform the call temporarily and replace inputSpec.
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321 | // Note: with initial states symbolic calls and non-symbolic calls to
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322 | // this method differ in how the initial states are passed. For
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323 | // symbolic calls, the initial states are passed in the first arg, as
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324 | // an Array of SymbolicTensors; for non-symbolic calls, they are
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325 | // passed in the second arg as a part of the kwargs. Hence the need to
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326 | // temporarily modify inputSpec here.
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327 | // TODO(cais): Make refactoring so that this hacky code below is no
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328 | // longer needed.
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329 | const originalInputSpec = this.inputSpec;
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330 | this.inputSpec = fullInputSpec;
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331 | const output = super.apply(fullInput, kwargs);
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332 | this.inputSpec = originalInputSpec;
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333 | return output;
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334 | }
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335 | else {
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336 | return super.apply(inputs, kwargs);
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337 | }
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338 | }
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339 | call(inputs, kwargs) {
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340 | return tidy(() => {
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341 | const initialState = kwargs['initialState'];
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342 | let y;
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343 | let yRev;
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344 | if (initialState == null) {
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345 | y = this.forwardLayer.call(inputs, kwargs);
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346 | yRev = this.backwardLayer.call(inputs, kwargs);
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347 | }
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348 | else {
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349 | const forwardState = initialState.slice(0, initialState.length / 2);
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350 | const backwardState = initialState.slice(initialState.length / 2);
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351 | y = this.forwardLayer.call(inputs, Object.assign(kwargs, { initialState: forwardState }));
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352 | yRev = this.backwardLayer.call(inputs, Object.assign(kwargs, { initialState: backwardState }));
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353 | }
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354 | let states;
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355 | if (this.returnState) {
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356 | if (Array.isArray(y)) {
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357 | states = y.slice(1).concat(yRev.slice(1));
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358 | }
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359 | else {
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360 | }
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361 | y = y[0];
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362 | yRev = yRev[0];
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363 | }
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364 | if (this.returnSequences) {
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365 | yRev = tfc.reverse(yRev, 1);
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366 | }
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367 | let output;
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368 | if (this.mergeMode === 'concat') {
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369 | output = K.concatenate([y, yRev]);
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370 | }
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371 | else if (this.mergeMode === 'sum') {
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372 | output = tfc.add(y, yRev);
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373 | }
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374 | else if (this.mergeMode === 'ave') {
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375 | output = tfc.mul(.5, tfc.add(y, yRev));
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376 | }
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377 | else if (this.mergeMode === 'mul') {
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378 | output = tfc.mul(y, yRev);
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379 | }
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380 | else if (this.mergeMode == null) {
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381 | output = [y, yRev];
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382 | }
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383 | // TODO(cais): Properly set learning phase.
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384 | if (this.returnState) {
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385 | if (this.mergeMode == null) {
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386 | return output.concat(states);
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387 | }
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388 | return [output].concat(states);
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389 | }
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390 | return output;
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391 | });
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392 | }
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393 | resetStates(states) {
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394 | this.forwardLayer.resetStates();
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395 | this.backwardLayer.resetStates();
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396 | }
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397 | build(inputShape) {
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398 | nameScope(this.forwardLayer.name, () => {
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399 | this.forwardLayer.build(inputShape);
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400 | });
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401 | nameScope(this.backwardLayer.name, () => {
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402 | this.backwardLayer.build(inputShape);
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403 | });
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404 | this.built = true;
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405 | }
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406 | computeMask(inputs, mask) {
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407 | if (Array.isArray(mask)) {
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408 | mask = mask[0];
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409 | }
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410 | let outputMask;
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411 | if (this.returnSequences) {
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412 | if (this.mergeMode == null) {
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413 | outputMask = [mask, mask];
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414 | }
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415 | else {
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416 | outputMask = mask;
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417 | }
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418 | }
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419 | else {
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420 | if (this.mergeMode == null) {
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421 | outputMask = [null, null];
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422 | }
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423 | else {
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424 | outputMask = null;
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425 | }
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426 | }
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427 | if (this.returnState) {
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428 | const states = this.forwardLayer.states;
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429 | const stateMask = states.map(state => null);
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430 | if (Array.isArray(outputMask)) {
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431 | return outputMask.concat(stateMask).concat(stateMask);
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432 | }
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433 | else {
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434 | return [outputMask].concat(stateMask).concat(stateMask);
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435 | }
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436 | }
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437 | else {
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438 | return outputMask;
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439 | }
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440 | }
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441 | get trainableWeights() {
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442 | return this.forwardLayer.trainableWeights.concat(this.backwardLayer.trainableWeights);
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443 | }
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444 | get nonTrainableWeights() {
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445 | return this.forwardLayer.nonTrainableWeights.concat(this.backwardLayer.nonTrainableWeights);
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446 | }
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447 | // TODO(cais): Implement constraints().
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448 | setFastWeightInitDuringBuild(value) {
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449 | super.setFastWeightInitDuringBuild(value);
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450 | if (this.forwardLayer != null) {
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451 | this.forwardLayer.setFastWeightInitDuringBuild(value);
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452 | }
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453 | if (this.backwardLayer != null) {
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454 | this.backwardLayer.setFastWeightInitDuringBuild(value);
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455 | }
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456 | }
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457 | getConfig() {
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458 | const config = {
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459 | 'mergeMode': this.mergeMode,
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460 | };
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461 | // TODO(cais): Add logic for `numConstants` once the property is added.
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462 | const baseConfig = super.getConfig();
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463 | Object.assign(config, baseConfig);
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464 | return config;
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465 | }
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466 | /** @nocollapse */
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467 | static fromConfig(cls, config) {
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468 | const rnnLayer = deserialize(config['layer']);
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469 | delete config['layer'];
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470 | // TODO(cais): Add logic for `numConstants` once the property is added.
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471 | if (config['numConstants'] != null) {
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472 | throw new NotImplementedError(`Deserialization of a Bidirectional layer with numConstants ` +
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473 | `present is not supported yet.`);
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474 | }
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475 | // tslint:disable-next-line:no-any
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476 | const newConfig = config;
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477 | newConfig['layer'] = rnnLayer;
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478 | return new cls(newConfig);
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479 | }
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480 | }
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481 | /** @nocollapse */
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482 | Bidirectional.className = 'Bidirectional';
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483 | serialization.registerClass(Bidirectional);
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484 | //# 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* @license\n * Copyright 2018 Google LLC\n *\n * Use of this source code is governed by an MIT-style\n * license that can be found in the LICENSE file or at\n * https://opensource.org/licenses/MIT.\n * =============================================================================\n */\n\n/**\n * Layers that augment the functionality of a base layer.\n */\n\nimport * as tfc from '@tensorflow/tfjs-core';\nimport {serialization, Tensor, tidy} from '@tensorflow/tfjs-core';\nimport * as K from '../backend/tfjs_backend';\nimport {nameScope} from '../common';\nimport {InputSpec, Layer, LayerArgs, SymbolicTensor} from '../engine/topology';\nimport {NotImplementedError, ValueError} from '../errors';\nimport {BidirectionalMergeMode, Shape, VALID_BIDIRECTIONAL_MERGE_MODES} from '../keras_format/common';\nimport {Kwargs} from '../types';\nimport {RegularizerFn, RnnStepFunction} from '../types';\nimport * as generic_utils from '../utils/generic_utils';\nimport {getExactlyOneShape, getExactlyOneTensor} from '../utils/types_utils';\nimport {LayerVariable} from '../variables';\n\nimport {rnn, RNN, standardizeArgs} from './recurrent';\nimport {deserialize} from './serialization';\n\nexport declare interface WrapperLayerArgs extends LayerArgs {\n  /**\n   * The layer to be wrapped.\n   */\n  layer: Layer;\n}\n\n/**\n * Abstract wrapper base class.\n *\n * Wrappers take another layer and augment it in various ways.\n * Do not use this class as a layer, it is only an abstract base class.\n * Two usable wrappers are the `TimeDistributed` and `Bidirectional` wrappers.\n */\nexport abstract class Wrapper extends Layer {\n  readonly layer: Layer;\n\n  constructor(args: WrapperLayerArgs) {\n    // Porting Note: In PyKeras, `self.layer` is set prior to the calling\n    //   `super()`. But we can't do that here due to TypeScript's restriction.\n    //   See: https://github.com/Microsoft/TypeScript/issues/8277\n    //   As a result, we have to add checks in `get trainable()` and\n    //   `set trainable()` below in order to prevent using `this.layer` when\n    //   its value is `undefined`. The super constructor does use the getter\n    //   and the setter of `this.layer`.\n    super(args);\n    this.layer = args.layer;\n  }\n\n  override build(inputShape: Shape|Shape[]): void {\n    this.built = true;\n  }\n\n  // TODO(cais): Implement activityRegularizer getter.\n\n  override get trainable(): boolean {\n    // Porting Note: the check of `this.layer` here is necessary due to the\n    //   way the `constructor` of this class is written (see Porting Note\n    //   above).\n    if (this.layer != null) {\n      return this.layer.trainable;\n    } else {\n      return false;\n    }\n  }\n\n  override set trainable(value: boolean) {\n    // Porting Note: the check of `this.layer` here is necessary due to the\n    //   way the `constructor` of this class is written (see Porting Note\n    //   above).\n    if (this.layer != null) {\n      this.layer.trainable = value;\n    }\n  }\n\n  override get trainableWeights(): LayerVariable[] {\n    return this.layer.trainableWeights;\n  }\n  // TODO(cais): Implement setter for trainableWeights.\n\n  override get nonTrainableWeights(): LayerVariable[] {\n    return this.layer.nonTrainableWeights;\n  }\n  // TODO(cais): Implement setter for nonTrainableWeights.\n\n  override get updates(): Tensor[] {\n    // tslint:disable-next-line:no-any\n    return (this.layer as any)._updates;\n  }\n\n  // TODO(cais): Implement getUpdatesFor().\n\n  override get losses(): RegularizerFn[] {\n    return this.layer.losses;\n  }\n\n  // TODO(cais): Implement getLossesFor().\n\n  override getWeights(): Tensor[] {\n    return this.layer.getWeights();\n  }\n\n  override setWeights(weights: Tensor[]): void {\n    this.layer.setWeights(weights);\n  }\n\n  override getConfig(): serialization.ConfigDict {\n    const config: serialization.ConfigDict = {\n      'layer': {\n        'className': this.layer.getClassName(),\n        'config': this.layer.getConfig(),\n      }\n    };\n    const baseConfig = super.getConfig();\n    Object.assign(config, baseConfig);\n    return config;\n  }\n\n  override setFastWeightInitDuringBuild(value: boolean) {\n    super.setFastWeightInitDuringBuild(value);\n    if (this.layer != null) {\n      this.layer.setFastWeightInitDuringBuild(value);\n    }\n  }\n\n  /** @nocollapse */\n  static override fromConfig<T extends serialization.Serializable>(\n      cls: serialization.SerializableConstructor<T>,\n      config: serialization.ConfigDict,\n      customObjects = {} as serialization.ConfigDict): T {\n    const layerConfig = config['layer'] as serialization.ConfigDict;\n    const layer = deserialize(layerConfig, customObjects) as Layer;\n    delete config['layer'];\n    const newConfig = {layer};\n    Object.assign(newConfig, config);\n    return new cls(newConfig);\n  }\n}\n\nexport class TimeDistributed extends Wrapper {\n  /** @nocollapse */\n  static className = 'TimeDistributed';\n  constructor(args: WrapperLayerArgs) {\n    super(args);\n    this.supportsMasking = true;\n  }\n\n  override build(inputShape: Shape|Shape[]): void {\n    inputShape = getExactlyOneShape(inputShape);\n    if (inputShape.length < 3) {\n      throw new ValueError(\n          `TimeDistributed layer expects an input shape >= 3D, but received ` +\n          `input shape ${JSON.stringify(inputShape)}`);\n    }\n    this.inputSpec = [{shape: inputShape}];\n    const childInputShape = [inputShape[0]].concat(inputShape.slice(2));\n    if (!this.layer.built) {\n      this.layer.build(childInputShape);\n      this.layer.built = true;\n    }\n    super.build(inputShape);\n  }\n\n  override computeOutputShape(inputShape: Shape|Shape[]): Shape|Shape[] {\n    inputShape = getExactlyOneShape(inputShape);\n    const childInputShape = [inputShape[0]].concat(inputShape.slice(2));\n    const childOutputShape =\n        this.layer.computeOutputShape(childInputShape) as Shape;\n    const timesteps = inputShape[1];\n    return [childOutputShape[0], timesteps].concat(childOutputShape.slice(1));\n  }\n\n  override call(inputs: Tensor|Tensor[], kwargs: Kwargs): Tensor|Tensor[] {\n    return tidy(() => {\n      // TODO(cais): Add 'training' and 'useLearningPhase' to kwargs.\n      inputs = getExactlyOneTensor(inputs);\n      // Porting Note: In tfjs-layers, `inputs` are always concrete tensor\n      // values. Hence the inputs can't have an undetermined first (batch)\n      // dimension, which is why we always use the K.rnn approach here.\n      const step: RnnStepFunction = (inputs: Tensor, states: Tensor[]) => {\n        // TODO(cais): Add useLearningPhase.\n        // NOTE(cais): `layer.call` may return a length-1 array of Tensor in\n        //   some cases (e.g., `layer` is a `Sequential` instance), which is\n        //   why `getExactlyOneTensor` is used below.\n        const output = getExactlyOneTensor(this.layer.call(inputs, kwargs));\n        return [output, []];\n      };\n      const rnnOutputs =\n          rnn(step, inputs, [], false /* goBackwards */, null /* mask */,\n              null /* constants */, false /* unroll */,\n              true /* needPerStepOutputs */);\n      const y = rnnOutputs[1];\n      // TODO(cais): Add activity regularization.\n      // TODO(cais): Add useLearningPhase.\n      return y;\n    });\n  }\n\n  // TODO(cais): Implement detailed computeMask() logic.\n}\nserialization.registerClass(TimeDistributed);\n\nexport function checkBidirectionalMergeMode(value?: string): void {\n  generic_utils.checkStringTypeUnionValue(\n      VALID_BIDIRECTIONAL_MERGE_MODES, 'BidirectionalMergeMode', value);\n}\n\nexport declare interface BidirectionalLayerArgs extends WrapperLayerArgs {\n  /**\n   * The instance of an `RNN` layer to be wrapped.\n   */\n  layer: RNN;\n\n  /**\n   * Mode by which outputs of the forward and backward RNNs are\n   * combined. If `null` or `undefined`, the output will not be\n   * combined, they will be returned as an `Array`.\n   *\n   * If `undefined` (i.e., not provided), defaults to `'concat'`.\n   */\n  mergeMode?: BidirectionalMergeMode;\n}\n\nconst DEFAULT_BIDIRECTIONAL_MERGE_MODE: BidirectionalMergeMode = 'concat';\n\nexport class Bidirectional extends Wrapper {\n  /** @nocollapse */\n  static className = 'Bidirectional';\n  mergeMode: BidirectionalMergeMode;\n  private forwardLayer: RNN;\n  private backwardLayer: RNN;\n  private returnSequences: boolean;\n  private returnState: boolean;\n  private numConstants?: number;\n  private _trainable: boolean;\n\n  constructor(args: BidirectionalLayerArgs) {\n    super(args);\n\n    // Note: When creating `this.forwardLayer`, the original Layer object\n    //   (`config.layer`) ought to be cloned. This is why we call\n    //   `getConfig()` followed by `deserialize()`. Without this cloning,\n    //   the layer names saved during serialization will incorrectly contain\n    //   the 'forward_' prefix. In Python Keras, this is done using\n    //   `copy.copy` (shallow copy), which does not have a simple equivalent\n    //   in JavaScript. JavaScript's `Object.assign()` does not copy\n    //   methods.\n    const layerConfig = args.layer.getConfig();\n    const forwDict: serialization.ConfigDict = {};\n    forwDict['className'] = args.layer.getClassName();\n    forwDict['config'] = layerConfig;\n    this.forwardLayer = deserialize(forwDict) as RNN;\n    layerConfig['goBackwards'] =\n        layerConfig['goBackwards'] === true ? false : true;\n    const backDict: serialization.ConfigDict = {};\n    backDict['className'] = args.layer.getClassName();\n    backDict['config'] = layerConfig;\n    this.backwardLayer = deserialize(backDict) as RNN;\n    this.forwardLayer.name = 'forward_' + this.forwardLayer.name;\n    this.backwardLayer.name = 'backward_' + this.backwardLayer.name;\n\n    this.mergeMode = args.mergeMode === undefined ?\n        DEFAULT_BIDIRECTIONAL_MERGE_MODE :\n        args.mergeMode;\n    checkBidirectionalMergeMode(this.mergeMode);\n    if (args.weights) {\n      throw new NotImplementedError(\n          'weights support is not implemented for Bidirectional layer yet.');\n    }\n    this._stateful = args.layer.stateful;\n    this.returnSequences = args.layer.returnSequences;\n    this.returnState = args.layer.returnState;\n    this.supportsMasking = true;\n    this._trainable = true;\n    this.inputSpec = args.layer.inputSpec;\n    this.numConstants = null;\n  }\n\n  override get trainable(): boolean {\n    return this._trainable;\n  }\n\n  override set trainable(value: boolean) {\n    // Porting Note: the check of `this.layer` here is necessary due to the\n    //   way the `constructor` of this class is written (see Porting Note\n    //   above).\n    this._trainable = value;\n    if (this.forwardLayer != null) {\n      this.forwardLayer.trainable = value;\n    }\n    if (this.backwardLayer != null) {\n      this.backwardLayer.trainable = value;\n    }\n  }\n\n  override getWeights(): Tensor[] {\n    return this.forwardLayer.getWeights().concat(\n        this.backwardLayer.getWeights());\n  }\n\n  override setWeights(weights: Tensor[]): void {\n    const numWeights = weights.length;\n    const numeightsOver2 = Math.floor(numWeights / 2);\n    this.forwardLayer.setWeights(weights.slice(0, numeightsOver2));\n    this.backwardLayer.setWeights(weights.slice(numeightsOver2));\n  }\n\n  override computeOutputShape(inputShape: Shape|Shape[]): Shape|Shape[] {\n    let layerShapes: Shape|Shape[] =\n        this.forwardLayer.computeOutputShape(inputShape);\n    if (!(Array.isArray(layerShapes) && Array.isArray(layerShapes[0]))) {\n      layerShapes = [layerShapes as Shape];\n    }\n    layerShapes = layerShapes as Shape[];\n\n    let outputShape: Shape;\n    let outputShapes: Shape[];\n    let stateShape: Shape[];\n    if (this.returnState) {\n      stateShape = layerShapes.slice(1);\n      outputShape = layerShapes[0];\n    } else {\n      outputShape = layerShapes[0];\n    }\n    outputShape = outputShape;\n    if (this.mergeMode === 'concat') {\n      outputShape[outputShape.length - 1] *= 2;\n      outputShapes = [outputShape];\n    } else if (this.mergeMode == null) {\n      outputShapes = [outputShape, outputShape.slice()];\n    } else {\n      outputShapes = [outputShape];\n    }\n\n    if (this.returnState) {\n      if (this.mergeMode == null) {\n        return outputShapes.concat(stateShape).concat(stateShape.slice());\n      }\n      return [outputShape].concat(stateShape).concat(stateShape.slice());\n    }\n    return generic_utils.singletonOrArray(outputShapes);\n  }\n\n  override apply(\n      inputs: Tensor|Tensor[]|SymbolicTensor|SymbolicTensor[],\n      kwargs?: Kwargs): Tensor|Tensor[]|SymbolicTensor|SymbolicTensor[] {\n    let initialState: Tensor[]|SymbolicTensor[] =\n        kwargs == null ? null : kwargs['initialState'];\n    let constants: Tensor[]|SymbolicTensor[] =\n        kwargs == null ? null : kwargs['constants'];\n    if (kwargs == null) {\n      kwargs = {};\n    }\n    const standardized =\n        standardizeArgs(inputs, initialState, constants, this.numConstants);\n    inputs = standardized.inputs;\n    initialState = standardized.initialState;\n    constants = standardized.constants;\n\n    if (Array.isArray(inputs)) {\n      initialState = (inputs as Tensor[] | SymbolicTensor[]).slice(1);\n      inputs = (inputs as Tensor[] | SymbolicTensor[])[0];\n    }\n\n    if ((initialState == null || initialState.length === 0) &&\n        constants == null) {\n      return super.apply(inputs, kwargs);\n    }\n    const additionalInputs: Array<Tensor|SymbolicTensor> = [];\n    const additionalSpecs: InputSpec[] = [];\n    if (initialState != null) {\n      const numStates = initialState.length;\n      if (numStates % 2 > 0) {\n        throw new ValueError(\n            'When passing `initialState` to a Bidrectional RNN, ' +\n            'the state should be an Array containing the states of ' +\n            'the underlying RNNs.');\n      }\n      kwargs['initialState'] = initialState;\n      additionalInputs.push(...initialState);\n      const stateSpecs = (initialState as Array<Tensor|SymbolicTensor>)\n                             .map(state => new InputSpec({shape: state.shape}));\n      this.forwardLayer.stateSpec = stateSpecs.slice(0, numStates / 2);\n      this.backwardLayer.stateSpec = stateSpecs.slice(numStates / 2);\n      additionalSpecs.push(...stateSpecs);\n    }\n    if (constants != null) {\n      throw new NotImplementedError(\n          'Support for constants in Bidirectional layers is not ' +\n          'implemented yet.');\n    }\n\n    const isSymbolicTensor = additionalInputs[0] instanceof SymbolicTensor;\n    for (const tensor of additionalInputs) {\n      if (tensor instanceof SymbolicTensor !== isSymbolicTensor) {\n        throw new ValueError(\n            'The initial state of a Bidirectional layer cannot be ' +\n            'specified as a mix of symbolic and non-symbolic tensors');\n      }\n    }\n\n    if (isSymbolicTensor) {\n      // Compute the full input and specs, including the states.\n      const fullInput = [inputs].concat(additionalInputs);\n      const fullInputSpec = this.inputSpec.concat(additionalSpecs);\n      // Perform the call temporarily and replace inputSpec.\n      // Note: with initial states symbolic calls and non-symbolic calls to\n      // this method differ in how the initial states are passed. For\n      // symbolic calls, the initial states are passed in the first arg, as\n      // an Array of SymbolicTensors; for non-symbolic calls, they are\n      // passed in the second arg as a part of the kwargs. Hence the need to\n      // temporarily modify inputSpec here.\n      // TODO(cais): Make refactoring so that this hacky code below is no\n      // longer needed.\n      const originalInputSpec = this.inputSpec;\n      this.inputSpec = fullInputSpec;\n      const output =\n          super.apply(fullInput as Tensor[] | SymbolicTensor[], kwargs);\n      this.inputSpec = originalInputSpec;\n      return output;\n    } else {\n      return super.apply(inputs, kwargs);\n    }\n  }\n\n  override call(inputs: Tensor|Tensor[], kwargs: Kwargs): Tensor|Tensor[] {\n    return tidy(() => {\n      const initialState = kwargs['initialState'];\n\n      let y: Tensor|Tensor[];\n      let yRev: Tensor|Tensor[];\n      if (initialState == null) {\n        y = this.forwardLayer.call(inputs, kwargs);\n        yRev = this.backwardLayer.call(inputs, kwargs);\n      } else {\n        const forwardState = initialState.slice(0, initialState.length / 2);\n        const backwardState = initialState.slice(initialState.length / 2);\n        y = this.forwardLayer.call(\n            inputs, Object.assign(kwargs, {initialState: forwardState}));\n        yRev = this.backwardLayer.call(\n            inputs, Object.assign(kwargs, {initialState: backwardState}));\n      }\n\n      let states: Tensor[];\n      if (this.returnState) {\n        if (Array.isArray(y)) {\n          states = y.slice(1).concat((yRev as Tensor[]).slice(1));\n        } else {\n        }\n        y = (y as Tensor[])[0];\n        yRev = (yRev as Tensor[])[0];\n      }\n\n      if (this.returnSequences) {\n        yRev = tfc.reverse(yRev as Tensor, 1);\n      }\n\n      let output: Tensor|Tensor[];\n      if (this.mergeMode === 'concat') {\n        output = K.concatenate([y as Tensor, yRev as Tensor]);\n      } else if (this.mergeMode === 'sum') {\n        output = tfc.add(y as Tensor, yRev as Tensor);\n      } else if (this.mergeMode === 'ave') {\n        output = tfc.mul(.5, tfc.add(y as Tensor, yRev as Tensor));\n      } else if (this.mergeMode === 'mul') {\n        output = tfc.mul(y as Tensor, yRev as Tensor);\n      } else if (this.mergeMode == null) {\n        output = [y as Tensor, yRev as Tensor];\n      }\n\n      // TODO(cais): Properly set learning phase.\n      if (this.returnState) {\n        if (this.mergeMode == null) {\n          return (output as Tensor[]).concat(states);\n        }\n        return [output as Tensor].concat(states);\n      }\n      return output;\n    });\n  }\n\n  override resetStates(states?: Tensor|Tensor[]): void {\n    this.forwardLayer.resetStates();\n    this.backwardLayer.resetStates();\n  }\n\n  override build(inputShape: Shape|Shape[]): void {\n    nameScope(this.forwardLayer.name, () => {\n      this.forwardLayer.build(inputShape);\n    });\n    nameScope(this.backwardLayer.name, () => {\n      this.backwardLayer.build(inputShape);\n    });\n    this.built = true;\n  }\n\n  override computeMask(inputs: Tensor|Tensor[], mask?: Tensor|Tensor[]): Tensor\n      |Tensor[] {\n    if (Array.isArray(mask)) {\n      mask = mask[0];\n    }\n    let outputMask: Tensor|Tensor[];\n    if (this.returnSequences) {\n      if (this.mergeMode == null) {\n        outputMask = [mask, mask];\n      } else {\n        outputMask = mask;\n      }\n    } else {\n      if (this.mergeMode == null) {\n        outputMask = [null, null];\n      } else {\n        outputMask = null;\n      }\n    }\n    if (this.returnState) {\n      const states = this.forwardLayer.states;\n      const stateMask: Tensor[] = states.map(state => null);\n      if (Array.isArray(outputMask)) {\n        return outputMask.concat(stateMask).concat(stateMask);\n      } else {\n        return [outputMask].concat(stateMask).concat(stateMask);\n      }\n    } else {\n      return outputMask;\n    }\n  }\n\n  override get trainableWeights(): LayerVariable[] {\n    return this.forwardLayer.trainableWeights.concat(\n        this.backwardLayer.trainableWeights);\n  }\n\n  override get nonTrainableWeights(): LayerVariable[] {\n    return this.forwardLayer.nonTrainableWeights.concat(\n        this.backwardLayer.nonTrainableWeights);\n  }\n\n  // TODO(cais): Implement constraints().\n\n  override setFastWeightInitDuringBuild(value: boolean) {\n    super.setFastWeightInitDuringBuild(value);\n    if (this.forwardLayer != null) {\n      this.forwardLayer.setFastWeightInitDuringBuild(value);\n    }\n    if (this.backwardLayer != null) {\n      this.backwardLayer.setFastWeightInitDuringBuild(value);\n    }\n  }\n\n  override getConfig(): serialization.ConfigDict {\n    const config: serialization.ConfigDict = {\n      'mergeMode': this.mergeMode,\n    };\n    // TODO(cais): Add logic for `numConstants` once the property is added.\n    const baseConfig = super.getConfig();\n    Object.assign(config, baseConfig);\n    return config;\n  }\n\n  /** @nocollapse */\n  static override fromConfig<T extends serialization.Serializable>(\n      cls: serialization.SerializableConstructor<T>,\n      config: serialization.ConfigDict): T {\n    const rnnLayer =\n        deserialize(config['layer'] as serialization.ConfigDict) as RNN;\n    delete config['layer'];\n    // TODO(cais): Add logic for `numConstants` once the property is added.\n    if (config['numConstants'] != null) {\n      throw new NotImplementedError(\n          `Deserialization of a Bidirectional layer with numConstants ` +\n          `present is not supported yet.`);\n    }\n    // tslint:disable-next-line:no-any\n    const newConfig: {[key: string]: any} = config;\n    newConfig['layer'] = rnnLayer;\n    return new cls(newConfig);\n  }\n}\nserialization.registerClass(Bidirectional);\n"]} |
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