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 | /* original source: keras/regularizers.py */
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11 | import * as tfc from '@tensorflow/tfjs-core';
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12 | import { abs, add, serialization, sum, tidy, zeros } from '@tensorflow/tfjs-core';
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13 | import * as K from './backend/tfjs_backend';
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14 | import { deserializeKerasObject, serializeKerasObject } from './utils/generic_utils';
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15 | function assertObjectArgs(args) {
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16 | if (args != null && typeof args !== 'object') {
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17 | throw new Error(`Argument to L1L2 regularizer's constructor is expected to be an ` +
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18 | `object, but received: ${args}`);
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19 | }
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20 | }
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21 | /**
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22 | * Regularizer base class.
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23 | */
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24 | export class Regularizer extends serialization.Serializable {
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25 | }
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26 | export class L1L2 extends Regularizer {
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27 | constructor(args) {
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28 | super();
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29 | assertObjectArgs(args);
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30 | this.l1 = args == null || args.l1 == null ? 0.01 : args.l1;
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31 | this.l2 = args == null || args.l2 == null ? 0.01 : args.l2;
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32 | this.hasL1 = this.l1 !== 0;
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33 | this.hasL2 = this.l2 !== 0;
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34 | }
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35 | /**
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36 | * Porting note: Renamed from __call__.
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37 | * @param x Variable of which to calculate the regularization score.
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38 | */
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39 | apply(x) {
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40 | return tidy(() => {
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41 | let regularization = zeros([1]);
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42 | if (this.hasL1) {
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43 | regularization = add(regularization, sum(tfc.mul(this.l1, abs(x))));
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44 | }
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45 | if (this.hasL2) {
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46 | regularization =
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47 | add(regularization, sum(tfc.mul(this.l2, K.square(x))));
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48 | }
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49 | return tfc.reshape(regularization, []);
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50 | });
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51 | }
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52 | getConfig() {
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53 | return { 'l1': this.l1, 'l2': this.l2 };
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54 | }
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55 | /** @nocollapse */
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56 | static fromConfig(cls, config) {
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57 | return new cls({ l1: config['l1'], l2: config['l2'] });
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58 | }
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59 | }
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60 | /** @nocollapse */
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61 | L1L2.className = 'L1L2';
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62 | serialization.registerClass(L1L2);
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63 | export function l1(args) {
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64 | assertObjectArgs(args);
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65 | return new L1L2({ l1: args != null ? args.l1 : null, l2: 0 });
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66 | }
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67 | export function l2(args) {
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68 | assertObjectArgs(args);
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69 | return new L1L2({ l2: args != null ? args.l2 : null, l1: 0 });
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70 | }
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71 | // Maps the JavaScript-like identifier keys to the corresponding keras symbols.
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72 | export const REGULARIZER_IDENTIFIER_REGISTRY_SYMBOL_MAP = {
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73 | 'l1l2': 'L1L2'
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74 | };
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75 | export function serializeRegularizer(constraint) {
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76 | return serializeKerasObject(constraint);
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77 | }
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78 | export function deserializeRegularizer(config, customObjects = {}) {
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79 | return deserializeKerasObject(config, serialization.SerializationMap.getMap().classNameMap, customObjects, 'regularizer');
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80 | }
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81 | export function getRegularizer(identifier) {
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82 | if (identifier == null) {
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83 | return null;
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84 | }
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85 | if (typeof identifier === 'string') {
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86 | const className = identifier in REGULARIZER_IDENTIFIER_REGISTRY_SYMBOL_MAP ?
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87 | REGULARIZER_IDENTIFIER_REGISTRY_SYMBOL_MAP[identifier] :
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88 | identifier;
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89 | const config = { className, config: {} };
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90 | return deserializeRegularizer(config);
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91 | }
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92 | else if (identifier instanceof Regularizer) {
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93 | return identifier;
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94 | }
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95 | else {
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96 | return deserializeRegularizer(identifier);
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97 | }
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98 | }
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Defaults to 0.01. */\n  l1?: number;\n  /** L2 regularization rate. Defaults to 0.01. */\n  l2?: number;\n}\n\nexport interface L1Args {\n  /** L1 regularization rate. Defaults to 0.01. */\n  l1: number;\n}\n\nexport interface L2Args {\n  /** L2 regularization rate. Defaults to 0.01. */\n  l2: number;\n}\n\nexport class L1L2 extends Regularizer {\n  /** @nocollapse */\n  static className = 'L1L2';\n\n  private readonly l1: number;\n  private readonly l2: number;\n  private readonly hasL1: boolean;\n  private readonly hasL2: boolean;\n  constructor(args?: L1L2Args) {\n    super();\n\n    assertObjectArgs(args);\n\n    this.l1 = args == null || args.l1 == null ? 0.01 : args.l1;\n    this.l2 = args == null || args.l2 == null ? 0.01 : args.l2;\n    this.hasL1 = this.l1 !== 0;\n    this.hasL2 = this.l2 !== 0;\n  }\n\n  /**\n   * Porting note: Renamed from __call__.\n   * @param x Variable of which to calculate the regularization score.\n   */\n  apply(x: Tensor): Scalar {\n    return tidy(() => {\n      let regularization: Tensor = zeros([1]);\n      if (this.hasL1) {\n        regularization = add(regularization, sum(tfc.mul(this.l1, abs(x))));\n      }\n      if (this.hasL2) {\n        regularization =\n            add(regularization, sum(tfc.mul(this.l2, K.square(x))));\n      }\n      return tfc.reshape(regularization, []);\n    });\n  }\n\n  getConfig(): serialization.ConfigDict {\n    return {'l1': this.l1, 'l2': this.l2};\n  }\n\n  /** @nocollapse */\n  static fromConfig<T extends serialization.Serializable>(\n      cls: serialization.SerializableConstructor<T>,\n      config: serialization.ConfigDict): T {\n    return new cls({l1: config['l1'] as number, l2: config['l2'] as number});\n  }\n}\nserialization.registerClass(L1L2);\n\nexport function l1(args?: L1Args) {\n  assertObjectArgs(args);\n  return new L1L2({l1: args != null ? args.l1 : null, l2: 0});\n}\n\nexport function l2(args: L2Args) {\n  assertObjectArgs(args);\n  return new L1L2({l2: args != null ? args.l2 : null, l1: 0});\n}\n\n/** @docinline */\nexport type RegularizerIdentifier = 'l1l2'|string;\n\n// Maps the JavaScript-like identifier keys to the corresponding keras symbols.\nexport const REGULARIZER_IDENTIFIER_REGISTRY_SYMBOL_MAP:\n    {[identifier in RegularizerIdentifier]: string} = {\n      'l1l2': 'L1L2'\n    };\n\nexport function serializeRegularizer(constraint: Regularizer):\n    serialization.ConfigDictValue {\n  return serializeKerasObject(constraint);\n}\n\nexport function deserializeRegularizer(\n    config: serialization.ConfigDict,\n    customObjects: serialization.ConfigDict = {}): Regularizer {\n  return deserializeKerasObject(\n      config, serialization.SerializationMap.getMap().classNameMap,\n      customObjects, 'regularizer');\n}\n\nexport function getRegularizer(identifier: RegularizerIdentifier|\n                               serialization.ConfigDict|\n                               Regularizer): Regularizer {\n  if (identifier == null) {\n    return null;\n  }\n  if (typeof identifier === 'string') {\n    const className = identifier in REGULARIZER_IDENTIFIER_REGISTRY_SYMBOL_MAP ?\n        REGULARIZER_IDENTIFIER_REGISTRY_SYMBOL_MAP[identifier] :\n        identifier;\n    const config = {className, config: {}};\n    return deserializeRegularizer(config);\n  } else if (identifier instanceof Regularizer) {\n    return identifier;\n  } else {\n    return deserializeRegularizer(identifier);\n  }\n}\n"]} |
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