/** * @license * Copyright 2018 Google LLC. All Rights Reserved. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ============================================================================= */ import { ENGINE } from '../engine'; import { dispose, tidy } from '../globals'; import { add } from '../ops/add'; import { div } from '../ops/div'; import { mul } from '../ops/mul'; import { sqrt } from '../ops/ops'; import { square } from '../ops/square'; import { zerosLike } from '../ops/zeros_like'; import { Optimizer } from './optimizer'; /** @doclink Optimizer */ export class AdadeltaOptimizer extends Optimizer { /** @nocollapse */ static get className() { // Name matters for Python compatibility. // This is a getter instead of a property because when it's a property, it // prevents the entire class from being tree-shaken. return 'Adadelta'; } constructor(learningRate, rho, epsilon = null) { super(); this.learningRate = learningRate; this.rho = rho; this.epsilon = epsilon; this.accumulatedGrads = []; this.accumulatedUpdates = []; if (epsilon == null) { this.epsilon = ENGINE.backend.epsilon(); } } applyGradients(variableGradients) { const variableNames = Array.isArray(variableGradients) ? variableGradients.map(item => item.name) : Object.keys(variableGradients); variableNames.forEach((name, i) => { const value = ENGINE.registeredVariables[name]; const trainable = false; if (this.accumulatedGrads[i] == null) { this.accumulatedGrads[i] = { originalName: `${name}/accum_grad`, variable: tidy(() => zerosLike(value).variable(trainable)) }; } if (this.accumulatedUpdates[i] == null) { this.accumulatedUpdates[i] = { originalName: `${name}/accum_var`, variable: tidy(() => zerosLike(value).variable(trainable)) }; } const gradient = Array.isArray(variableGradients) ? variableGradients[i].tensor : variableGradients[name]; if (gradient == null) { return; } const accumulatedGrad = this.accumulatedGrads[i].variable; const accumulatedUpdate = this.accumulatedUpdates[i].variable; tidy(() => { const newAccumulatedGrad = add(mul(accumulatedGrad, this.rho), mul(square(gradient), 1 - this.rho)); const updates = mul(div(sqrt(add(accumulatedUpdate, this.epsilon)), sqrt(add(accumulatedGrad, this.epsilon))), gradient); const newAccumulatedUpdate = add(mul(accumulatedUpdate, this.rho), mul(square(updates), 1 - this.rho)); accumulatedGrad.assign(newAccumulatedGrad); accumulatedUpdate.assign(newAccumulatedUpdate); const newValue = add(mul(updates, -this.learningRate), value); value.assign(newValue); }); }); this.incrementIterations(); } dispose() { if (this.accumulatedUpdates != null) { dispose(this.accumulatedGrads.map(v => v.variable)); dispose(this.accumulatedUpdates.map(v => v.variable)); } } async getWeights() { // Order matters for Python compatibility. const variables = [...this.accumulatedGrads, ...this.accumulatedUpdates]; return [await this.saveIterations()].concat(variables.map(v => ({ name: v.originalName, tensor: v.variable }))); } async setWeights(weightValues) { weightValues = await this.extractIterations(weightValues); const variableCount = weightValues.length / 2; const trainable = false; this.accumulatedGrads = weightValues.slice(0, variableCount).map(v => ({ originalName: v.name, variable: v.tensor.variable(trainable) })); this.accumulatedUpdates = weightValues.slice(variableCount, variableCount * 2) .map(v => ({ originalName: v.name, variable: v.tensor.variable(trainable) })); } getConfig() { return { 'learningRate': this.learningRate, 'rho': this.rho, 'epsilon': this.epsilon }; } /** @nocollapse */ static fromConfig(cls, config) { return new cls(config['learningRate'], config['rho'], config['epsilon']); } } //# 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* @license\n * Copyright 2018 Google LLC. All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {ENGINE} from '../engine';\nimport {dispose, tidy} from '../globals';\nimport {add} from '../ops/add';\nimport {div} from '../ops/div';\nimport {mul} from '../ops/mul';\nimport {sqrt} from '../ops/ops';\nimport {square} from '../ops/square';\nimport {zerosLike} from '../ops/zeros_like';\nimport {ConfigDict, Serializable, SerializableConstructor} from '../serialization';\nimport {NamedTensor, NamedVariableMap} from '../tensor_types';\n\nimport {Optimizer, OptimizerVariable} from './optimizer';\n\n/** @doclink Optimizer */\nexport class AdadeltaOptimizer extends Optimizer {\n  /** @nocollapse */\n  static get className() {\n    // Name matters for Python compatibility.\n    // This is a getter instead of a property because when it's a property, it\n    // prevents the entire class from being tree-shaken.\n    return 'Adadelta';\n  }\n  private accumulatedGrads: OptimizerVariable[] = [];\n  private accumulatedUpdates: OptimizerVariable[] = [];\n\n  constructor(\n      protected learningRate: number, protected rho: number,\n      protected epsilon: number = null) {\n    super();\n\n    if (epsilon == null) {\n      this.epsilon = ENGINE.backend.epsilon();\n    }\n  }\n\n  applyGradients(variableGradients: NamedVariableMap|NamedTensor[]) {\n    const variableNames = Array.isArray(variableGradients) ?\n        variableGradients.map(item => item.name) :\n        Object.keys(variableGradients);\n\n    variableNames.forEach((name, i) => {\n      const value = ENGINE.registeredVariables[name];\n      const trainable = false;\n      if (this.accumulatedGrads[i] == null) {\n        this.accumulatedGrads[i] = {\n          originalName: `${name}/accum_grad`,\n          variable: tidy(() => zerosLike(value).variable(trainable))\n        };\n      }\n      if (this.accumulatedUpdates[i] == null) {\n        this.accumulatedUpdates[i] = {\n          originalName: `${name}/accum_var`,\n          variable: tidy(() => zerosLike(value).variable(trainable))\n        };\n      }\n\n      const gradient = Array.isArray(variableGradients) ?\n          variableGradients[i].tensor :\n          variableGradients[name];\n      if (gradient == null) {\n        return;\n      }\n\n      const accumulatedGrad = this.accumulatedGrads[i].variable;\n      const accumulatedUpdate = this.accumulatedUpdates[i].variable;\n\n      tidy(() => {\n        const newAccumulatedGrad =\n            add(mul(accumulatedGrad, this.rho),\n                mul(square(gradient), 1 - this.rho));\n\n        const updates =\n            mul(div(sqrt(add(accumulatedUpdate, this.epsilon)),\n                    sqrt(add(accumulatedGrad, this.epsilon))),\n                gradient);\n\n        const newAccumulatedUpdate =\n            add(mul(accumulatedUpdate, this.rho),\n                mul(square(updates), 1 - this.rho));\n\n        accumulatedGrad.assign(newAccumulatedGrad);\n        accumulatedUpdate.assign(newAccumulatedUpdate);\n\n        const newValue = add(mul(updates, -this.learningRate), value);\n        value.assign(newValue);\n      });\n    });\n    this.incrementIterations();\n  }\n\n  override dispose(): void {\n    if (this.accumulatedUpdates != null) {\n      dispose(this.accumulatedGrads.map(v => v.variable));\n      dispose(this.accumulatedUpdates.map(v => v.variable));\n    }\n  }\n\n  override async getWeights(): Promise<NamedTensor[]> {\n    // Order matters for Python compatibility.\n    const variables: OptimizerVariable[] =\n        [...this.accumulatedGrads, ...this.accumulatedUpdates];\n    return [await this.saveIterations()].concat(\n        variables.map(v => ({name: v.originalName, tensor: v.variable})));\n  }\n\n  override async setWeights(weightValues: NamedTensor[]): Promise<void> {\n    weightValues = await this.extractIterations(weightValues);\n    const variableCount = weightValues.length / 2;\n    const trainable = false;\n    this.accumulatedGrads =\n        weightValues.slice(0, variableCount).map(v => ({\n                                                   originalName: v.name,\n                                                   variable: v.tensor.variable(\n                                                       trainable)\n                                                 }));\n    this.accumulatedUpdates =\n        weightValues.slice(variableCount, variableCount * 2)\n            .map(v => ({\n                   originalName: v.name,\n                   variable: v.tensor.variable(trainable)\n                 }));\n  }\n\n  getConfig(): ConfigDict {\n    return {\n      'learningRate': this.learningRate,\n      'rho': this.rho,\n      'epsilon': this.epsilon\n    };\n  }\n\n  /** @nocollapse */\n  static override fromConfig<T extends Serializable>(\n      cls: SerializableConstructor<T>, config: ConfigDict): T {\n    return new cls(config['learningRate'], config['rho'], config['epsilon']);\n  }\n}\n"]}