@tensorflow/tfjs-layers/dist/constraints.js

TensorFlow layers API in JavaScript

/**
 * @license
 * Copyright 2018 Google LLC
 *
 * Use of this source code is governed by an MIT-style
 * license that can be found in the LICENSE file or at
 * https://opensource.org/licenses/MIT.
 * =============================================================================
 */
/* Original source: keras/contraints.py */
import * as tfc from '@tensorflow/tfjs-core';
import { serialization, tidy } from '@tensorflow/tfjs-core';
import { epsilon } from './backend/common';
import { deserializeKerasObject, serializeKerasObject } from './utils/generic_utils';
/**
 * Helper function used by many of the Constraints to find the L2Norms.
 */
function calcL2Norms(w, axis) {
    return tidy(() => tfc.sqrt(tfc.sum(tfc.mul(w, w), axis, true)));
}
/**
 * Base class for functions that impose constraints on weight values
 *
 * @doc {
 *   heading: 'Constraints',
 *   subheading: 'Classes',
 *   namespace: 'constraints'
 * }
 */
export class Constraint extends serialization.Serializable {
    getConfig() {
        return {};
    }
}
class MaxNorm extends Constraint {
    constructor(args) {
        super();
        this.defaultMaxValue = 2;
        this.defaultAxis = 0;
        this.maxValue =
            args.maxValue != null ? args.maxValue : this.defaultMaxValue;
        this.axis = args.axis != null ? args.axis : this.defaultAxis;
    }
    apply(w) {
        return tidy(() => {
            const norms = calcL2Norms(w, this.axis);
            const desired = tfc.clipByValue(norms, 0, this.maxValue);
            return tfc.mul(w, tfc.div(desired, tfc.add(epsilon(), norms)));
        });
    }
    getConfig() {
        return { maxValue: this.maxValue, axis: this.axis };
    }
}
/** @nocollapse */
MaxNorm.className = 'MaxNorm';
export { MaxNorm };
serialization.registerClass(MaxNorm);
class UnitNorm extends Constraint {
    constructor(args) {
        super();
        this.defaultAxis = 0;
        this.axis = args.axis != null ? args.axis : this.defaultAxis;
    }
    apply(w) {
        return tidy(() => tfc.div(w, tfc.add(epsilon(), calcL2Norms(w, this.axis))));
    }
    getConfig() {
        return { axis: this.axis };
    }
}
/** @nocollapse */
UnitNorm.className = 'UnitNorm';
export { UnitNorm };
serialization.registerClass(UnitNorm);
class NonNeg extends Constraint {
    apply(w) {
        return tfc.relu(w);
    }
}
/** @nocollapse */
NonNeg.className = 'NonNeg';
export { NonNeg };
serialization.registerClass(NonNeg);
class MinMaxNorm extends Constraint {
    constructor(args) {
        super();
        this.defaultMinValue = 0.0;
        this.defaultMaxValue = 1.0;
        this.defaultRate = 1.0;
        this.defaultAxis = 0;
        this.minValue =
            args.minValue != null ? args.minValue : this.defaultMinValue;
        this.maxValue =
            args.maxValue != null ? args.maxValue : this.defaultMaxValue;
        this.rate = args.rate != null ? args.rate : this.defaultRate;
        this.axis = args.axis != null ? args.axis : this.defaultAxis;
    }
    apply(w) {
        return tidy(() => {
            const norms = calcL2Norms(w, this.axis);
            const desired = tfc.add(tfc.mul(this.rate, tfc.clipByValue(norms, this.minValue, this.maxValue)), tfc.mul(1.0 - this.rate, norms));
            return tfc.mul(w, tfc.div(desired, tfc.add(epsilon(), norms)));
        });
    }
    getConfig() {
        return {
            minValue: this.minValue,
            maxValue: this.maxValue,
            rate: this.rate,
            axis: this.axis
        };
    }
}
/** @nocollapse */
MinMaxNorm.className = 'MinMaxNorm';
export { MinMaxNorm };
serialization.registerClass(MinMaxNorm);
// Maps the JavaScript-like identifier keys to the corresponding registry
// symbols.
export const CONSTRAINT_IDENTIFIER_REGISTRY_SYMBOL_MAP = {
    'maxNorm': 'MaxNorm',
    'minMaxNorm': 'MinMaxNorm',
    'nonNeg': 'NonNeg',
    'unitNorm': 'UnitNorm'
};
export function serializeConstraint(constraint) {
    return serializeKerasObject(constraint);
}
export function deserializeConstraint(config, customObjects = {}) {
    return deserializeKerasObject(config, serialization.SerializationMap.getMap().classNameMap, customObjects, 'constraint');
}
export function getConstraint(identifier) {
    if (identifier == null) {
        return null;
    }
    if (typeof identifier === 'string') {
        const className = identifier in CONSTRAINT_IDENTIFIER_REGISTRY_SYMBOL_MAP ?
            CONSTRAINT_IDENTIFIER_REGISTRY_SYMBOL_MAP[identifier] :
            identifier;
        const config = { className, config: {} };
        return deserializeConstraint(config);
    }
    else if (identifier instanceof Constraint) {
        return identifier;
    }
    else {
        return deserializeConstraint(identifier);
    }
}
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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/* Original source: keras/contraints.py */\n\nimport * as tfc from '@tensorflow/tfjs-core';\nimport {serialization, Tensor, tidy} from '@tensorflow/tfjs-core';\nimport {epsilon} from './backend/common';\nimport {deserializeKerasObject, serializeKerasObject} from './utils/generic_utils';\n\n/**\n * Helper function used by many of the Constraints to find the L2Norms.\n */\nfunction calcL2Norms(w: Tensor, axis: number): Tensor {\n  return tidy(() => tfc.sqrt(tfc.sum(tfc.mul(w, w), axis, true)));\n}\n\n/**\n * Base class for functions that impose constraints on weight values\n *\n * @doc {\n *   heading: 'Constraints',\n *   subheading: 'Classes',\n *   namespace: 'constraints'\n * }\n */\nexport abstract class Constraint extends serialization.Serializable {\n  /* Porting note: was __call__, apply chosen to match other similar choices */\n  abstract apply(w: Tensor): Tensor;\n  getConfig(): serialization.ConfigDict {\n    return {};\n  }\n}\n\nexport interface MaxNormArgs {\n  /**\n   * Maximum norm for incoming weights\n   */\n  maxValue?: number;\n  /**\n   * Axis along which to calculate norms.\n   *\n   *  For instance, in a `Dense` layer the weight matrix\n   *  has shape `[inputDim, outputDim]`,\n   *  set `axis` to `0` to constrain each weight vector\n   *  of length `[inputDim,]`.\n   *  In a `Conv2D` layer with `dataFormat=\"channels_last\"`,\n   *  the weight tensor has shape\n   *  `[rows, cols, inputDepth, outputDepth]`,\n   *  set `axis` to `[0, 1, 2]`\n   *  to constrain the weights of each filter tensor of size\n   *  `[rows, cols, inputDepth]`.\n   */\n  axis?: number;\n}\n\nexport class MaxNorm extends Constraint {\n  /** @nocollapse */\n  static readonly className = 'MaxNorm';\n  private maxValue: number;\n  private axis: number;\n  private readonly defaultMaxValue = 2;\n  private readonly defaultAxis = 0;\n\n  constructor(args: MaxNormArgs) {\n    super();\n    this.maxValue =\n        args.maxValue != null ? args.maxValue : this.defaultMaxValue;\n    this.axis = args.axis != null ? args.axis : this.defaultAxis;\n  }\n\n  apply(w: Tensor): Tensor {\n    return tidy(() => {\n      const norms = calcL2Norms(w, this.axis);\n      const desired = tfc.clipByValue(norms, 0, this.maxValue);\n      return tfc.mul(w, tfc.div(desired, tfc.add(epsilon(), norms)));\n    });\n  }\n\n  override getConfig(): serialization.ConfigDict {\n    return {maxValue: this.maxValue, axis: this.axis};\n  }\n}\nserialization.registerClass(MaxNorm);\n\nexport interface UnitNormArgs {\n  /**\n   * Axis along which to calculate norms.\n   *\n   * For instance, in a `Dense` layer the weight matrix\n   * has shape `[inputDim, outputDim]`,\n   * set `axis` to `0` to constrain each weight vector\n   * of length `[inputDim,]`.\n   * In a `Conv2D` layer with `dataFormat=\"channels_last\"`,\n   * the weight tensor has shape\n   * `[rows, cols, inputDepth, outputDepth]`,\n   * set `axis` to `[0, 1, 2]`\n   * to constrain the weights of each filter tensor of size\n   * `[rows, cols, inputDepth]`.\n   */\n  axis?: number;\n}\n\nexport class UnitNorm extends Constraint {\n  /** @nocollapse */\n  static readonly className = 'UnitNorm';\n  private axis: number;\n  private readonly defaultAxis = 0;\n  constructor(args: UnitNormArgs) {\n    super();\n    this.axis = args.axis != null ? args.axis : this.defaultAxis;\n  }\n\n  apply(w: Tensor): Tensor {\n    return tidy(\n        () => tfc.div(w, tfc.add(epsilon(), calcL2Norms(w, this.axis))));\n  }\n\n  override getConfig(): serialization.ConfigDict {\n    return {axis: this.axis};\n  }\n}\nserialization.registerClass(UnitNorm);\n\nexport class NonNeg extends Constraint {\n  /** @nocollapse */\n  static readonly className = 'NonNeg';\n\n  apply(w: Tensor): Tensor {\n    return tfc.relu(w);\n  }\n}\nserialization.registerClass(NonNeg);\n\nexport interface MinMaxNormArgs {\n  /**\n   * Minimum norm for incoming weights\n   */\n  minValue?: number;\n  /**\n   * Maximum norm for incoming weights\n   */\n  maxValue?: number;\n  /**\n   * Axis along which to calculate norms.\n   * For instance, in a `Dense` layer the weight matrix\n   * has shape `[inputDim, outputDim]`,\n   * set `axis` to `0` to constrain each weight vector\n   * of length `[inputDim,]`.\n   * In a `Conv2D` layer with `dataFormat=\"channels_last\"`,\n   * the weight tensor has shape\n   * `[rows, cols, inputDepth, outputDepth]`,\n   * set `axis` to `[0, 1, 2]`\n   * to constrain the weights of each filter tensor of size\n   * `[rows, cols, inputDepth]`.\n   */\n  axis?: number;\n  /**\n   * Rate for enforcing the constraint: weights will be rescaled to yield:\n   * `(1 - rate) * norm + rate * norm.clip(minValue, maxValue)`.\n   * Effectively, this means that rate=1.0 stands for strict\n   * enforcement of the constraint, while rate<1.0 means that\n   * weights will be rescaled at each step to slowly move\n   * towards a value inside the desired interval.\n   */\n  rate?: number;\n}\n\nexport class MinMaxNorm extends Constraint {\n  /** @nocollapse */\n  static readonly className = 'MinMaxNorm';\n  private minValue: number;\n  private maxValue: number;\n  private rate: number;\n  private axis: number;\n  private readonly defaultMinValue = 0.0;\n  private readonly defaultMaxValue = 1.0;\n  private readonly defaultRate = 1.0;\n  private readonly defaultAxis = 0;\n\n  constructor(args: MinMaxNormArgs) {\n    super();\n    this.minValue =\n        args.minValue != null ? args.minValue : this.defaultMinValue;\n    this.maxValue =\n        args.maxValue != null ? args.maxValue : this.defaultMaxValue;\n    this.rate = args.rate != null ? args.rate : this.defaultRate;\n    this.axis = args.axis != null ? args.axis : this.defaultAxis;\n  }\n\n  apply(w: Tensor): Tensor {\n    return tidy(() => {\n      const norms = calcL2Norms(w, this.axis);\n      const desired = tfc.add(\n          tfc.mul(\n              this.rate, tfc.clipByValue(norms, this.minValue, this.maxValue)),\n          tfc.mul(1.0 - this.rate, norms));\n      return tfc.mul(w, tfc.div(desired, tfc.add(epsilon(), norms)));\n    });\n  }\n\n  override getConfig(): serialization.ConfigDict {\n    return {\n      minValue: this.minValue,\n      maxValue: this.maxValue,\n      rate: this.rate,\n      axis: this.axis\n    };\n  }\n}\nserialization.registerClass(MinMaxNorm);\n\n/** @docinline */\nexport type ConstraintIdentifier =\n    'maxNorm'|'minMaxNorm'|'nonNeg'|'unitNorm'|string;\n\n// Maps the JavaScript-like identifier keys to the corresponding registry\n// symbols.\nexport const CONSTRAINT_IDENTIFIER_REGISTRY_SYMBOL_MAP:\n    {[identifier in ConstraintIdentifier]: string} = {\n      'maxNorm': 'MaxNorm',\n      'minMaxNorm': 'MinMaxNorm',\n      'nonNeg': 'NonNeg',\n      'unitNorm': 'UnitNorm'\n    };\n\nexport function serializeConstraint(constraint: Constraint):\n    serialization.ConfigDictValue {\n  return serializeKerasObject(constraint);\n}\n\nexport function deserializeConstraint(\n    config: serialization.ConfigDict,\n    customObjects: serialization.ConfigDict = {}): Constraint {\n  return deserializeKerasObject(\n      config, serialization.SerializationMap.getMap().classNameMap,\n      customObjects, 'constraint');\n}\n\nexport function getConstraint(identifier: ConstraintIdentifier|\n                              serialization.ConfigDict|Constraint): Constraint {\n  if (identifier == null) {\n    return null;\n  }\n  if (typeof identifier === 'string') {\n    const className = identifier in CONSTRAINT_IDENTIFIER_REGISTRY_SYMBOL_MAP ?\n        CONSTRAINT_IDENTIFIER_REGISTRY_SYMBOL_MAP[identifier] :\n        identifier;\n    const config = {className, config: {}};\n    return deserializeConstraint(config);\n  } else if (identifier instanceof Constraint) {\n    return identifier;\n  } else {\n    return deserializeConstraint(identifier);\n  }\n}\n"]}