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

/**
 * @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.
 * =============================================================================
 */
/**
 * TensorFlow.js Layers: Embedding Layer.
 *
 * Original source: keras/constraints.py
 */
import { notEqual, reshape, serialization, tidy, zerosLike } from '@tensorflow/tfjs-core';
import * as K from '../backend/tfjs_backend';
import { getConstraint, serializeConstraint } from '../constraints';
import { Layer } from '../engine/topology';
import { ValueError } from '../errors';
import { getInitializer, serializeInitializer } from '../initializers';
import { getRegularizer, serializeRegularizer } from '../regularizers';
import * as generic_utils from '../utils/generic_utils';
import { getExactlyOneShape, getExactlyOneTensor } from '../utils/types_utils';
export class Embedding extends Layer {
    constructor(args) {
        super(args);
        this.embeddings = null;
        this.DEFAULT_EMBEDDINGS_INITIALIZER = 'randomUniform';
        if (args.batchInputShape == null && args.inputShape == null) {
            // Porting Note: This logic is copied from Layer's constructor, since we
            // can't do exactly what the Python constructor does for Embedding().
            // Specifically, the super constructor can not be called after the
            // mutation of the `config` argument.
            let batchSize = null;
            if (args.batchSize != null) {
                batchSize = args.batchSize;
            }
            if (args.inputLength == null) {
                // Fix super-constructor to what it would have done if
                // 'config.inputShape' were (None, )
                this.batchInputShape = [batchSize, null];
            }
            else {
                // Fix super-constructor to what it would have done if
                // 'config.inputShape' were (config.inputLength, )
                this.batchInputShape =
                    [batchSize].concat(generic_utils.toList(args.inputLength));
            }
        }
        this.inputDim = args.inputDim;
        generic_utils.assertPositiveInteger(this.inputDim, 'inputDim');
        this.outputDim = args.outputDim;
        generic_utils.assertPositiveInteger(this.outputDim, 'outputDim');
        this.embeddingsInitializer = getInitializer(args.embeddingsInitializer || this.DEFAULT_EMBEDDINGS_INITIALIZER);
        this.embeddingsRegularizer = getRegularizer(args.embeddingsRegularizer);
        this.activityRegularizer = getRegularizer(args.activityRegularizer);
        this.embeddingsConstraint = getConstraint(args.embeddingsConstraint);
        this.maskZero = args.maskZero;
        this.supportsMasking = args.maskZero;
        this.inputLength = args.inputLength;
    }
    build(inputShape) {
        this.embeddings = this.addWeight('embeddings', [this.inputDim, this.outputDim], this.dtype, this.embeddingsInitializer, this.embeddingsRegularizer, true, this.embeddingsConstraint);
        this.built = true;
    }
    // Override warnOnIncompatibleInputShape because an embedding layer allows
    // the input to have varying ranks.
    warnOnIncompatibleInputShape(inputShape) { }
    computeMask(inputs, mask) {
        return tidy(() => {
            if (!this.maskZero) {
                return null;
            }
            else {
                inputs = getExactlyOneTensor(inputs);
                return notEqual(inputs, zerosLike(inputs));
            }
        });
    }
    computeOutputShape(inputShape) {
        inputShape = getExactlyOneShape(inputShape);
        if (this.inputLength == null) {
            return [...inputShape, this.outputDim];
        }
        // inputLength can be an array if input is 3D or higher.
        const inLens = generic_utils.toList(this.inputLength);
        if (inLens.length !== inputShape.length - 1) {
            throw new ValueError(`"inputLength" is ${this.inputLength}, but received ` +
                `input shape has shape ${inputShape}`);
        }
        else {
            let i = 0;
            for (let k = 0; k < inLens.length; ++k) {
                const s1 = inLens[k];
                const s2 = inputShape[k + 1];
                if ((s1 != null) && (s2 != null) && (s1 !== s2)) {
                    throw new ValueError(`"inputLength" is ${this.inputLength}, but received ` +
                        `input shape has shape ${inputShape}`);
                }
                else if (s1 == null) {
                    inLens[i] = s2;
                }
                i++;
            }
        }
        return [inputShape[0], ...inLens, this.outputDim];
    }
    call(inputs, kwargs) {
        return tidy(() => {
            this.invokeCallHook(inputs, kwargs);
            // Embedding layer accepts only a single input.
            let input = getExactlyOneTensor(inputs);
            if (input.dtype !== 'int32') {
                input = K.cast(input, 'int32');
            }
            const output = K.gather(this.embeddings.read(), reshape(input, [input.size]));
            return reshape(output, getExactlyOneShape(this.computeOutputShape(input.shape)));
        });
    }
    getConfig() {
        const config = {
            inputDim: this.inputDim,
            outputDim: this.outputDim,
            embeddingsInitializer: serializeInitializer(this.embeddingsInitializer),
            embeddingsRegularizer: serializeRegularizer(this.embeddingsRegularizer),
            activityRegularizer: serializeRegularizer(this.activityRegularizer),
            embeddingsConstraint: serializeConstraint(this.embeddingsConstraint),
            maskZero: this.maskZero,
            inputLength: this.inputLength
        };
        const baseConfig = super.getConfig();
        Object.assign(config, baseConfig);
        return config;
    }
}
/** @nocollapse */
Embedding.className = 'Embedding';
serialization.registerClass(Embedding);
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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 * TensorFlow.js Layers: Embedding Layer.\n *\n * Original source: keras/constraints.py\n */\nimport {notEqual, reshape, serialization, Tensor, tidy, zerosLike} from '@tensorflow/tfjs-core';\n\nimport * as K from '../backend/tfjs_backend';\nimport {Constraint, ConstraintIdentifier, getConstraint, serializeConstraint} from '../constraints';\nimport {Layer, LayerArgs} from '../engine/topology';\nimport {ValueError} from '../errors';\nimport {getInitializer, Initializer, InitializerIdentifier, serializeInitializer} from '../initializers';\nimport {Shape} from '../keras_format/common';\nimport {getRegularizer, Regularizer, RegularizerIdentifier, serializeRegularizer} from '../regularizers';\nimport {Kwargs} from '../types';\nimport * as generic_utils from '../utils/generic_utils';\nimport {getExactlyOneShape, getExactlyOneTensor} from '../utils/types_utils';\nimport {LayerVariable} from '../variables';\n\nexport declare interface EmbeddingLayerArgs extends LayerArgs {\n  /**\n   * Integer > 0. Size of the vocabulary, i.e. maximum integer index + 1.\n   */\n  inputDim: number;\n  /**\n   * Integer >= 0. Dimension of the dense embedding.\n   */\n  outputDim: number;\n  /**\n   * Initializer for the `embeddings` matrix.\n   */\n  embeddingsInitializer?: InitializerIdentifier|Initializer;\n  /**\n   * Regularizer function applied to the `embeddings` matrix.\n   */\n  embeddingsRegularizer?: RegularizerIdentifier|Regularizer;\n  /**\n   * Regularizer function applied to the activation.\n   */\n  activityRegularizer?: RegularizerIdentifier|Regularizer;\n  /**\n   * Constraint function applied to the `embeddings` matrix.\n   */\n  embeddingsConstraint?: ConstraintIdentifier|Constraint;\n  /**\n   * Whether the input value 0 is a special \"padding\" value that should be\n   * masked out. This is useful when using recurrent layers which may take\n   * variable length input.\n   *\n   * If this is `True` then all subsequent layers in the model need to support\n   * masking or an exception will be raised. If maskZero is set to `True`, as a\n   * consequence, index 0 cannot be used in the vocabulary (inputDim should\n   * equal size of vocabulary + 1).\n   */\n  maskZero?: boolean;\n  /**\n   * Length of input sequences, when it is constant.\n   *\n   * This argument is required if you are going to connect `flatten` then\n   * `dense` layers upstream (without it, the shape of the dense outputs cannot\n   * be computed).\n   */\n  inputLength?: number|number[];\n}\n\nexport class Embedding extends Layer {\n  /** @nocollapse */\n  static className = 'Embedding';\n  private inputDim: number;\n  private outputDim: number;\n  private embeddingsInitializer: Initializer;\n  private maskZero: boolean;\n  private inputLength: number|number[];\n\n  private embeddings: LayerVariable = null;\n\n  readonly DEFAULT_EMBEDDINGS_INITIALIZER: InitializerIdentifier =\n      'randomUniform';\n  private readonly embeddingsRegularizer?: Regularizer;\n  private readonly embeddingsConstraint?: Constraint;\n\n  constructor(args: EmbeddingLayerArgs) {\n    super(args);\n    if (args.batchInputShape == null && args.inputShape == null) {\n      // Porting Note: This logic is copied from Layer's constructor, since we\n      // can't do exactly what the Python constructor does for Embedding().\n      // Specifically, the super constructor can not be called after the\n      // mutation of the `config` argument.\n      let batchSize: number = null;\n      if (args.batchSize != null) {\n        batchSize = args.batchSize;\n      }\n      if (args.inputLength == null) {\n        // Fix super-constructor to what it would have done if\n        // 'config.inputShape' were (None, )\n        this.batchInputShape = [batchSize, null];\n      } else {\n        // Fix super-constructor to what it would have done if\n        // 'config.inputShape' were (config.inputLength, )\n        this.batchInputShape =\n            [batchSize].concat(generic_utils.toList(args.inputLength));\n      }\n    }\n    this.inputDim = args.inputDim;\n    generic_utils.assertPositiveInteger(this.inputDim, 'inputDim');\n    this.outputDim = args.outputDim;\n    generic_utils.assertPositiveInteger(this.outputDim, 'outputDim');\n    this.embeddingsInitializer = getInitializer(\n        args.embeddingsInitializer || this.DEFAULT_EMBEDDINGS_INITIALIZER);\n    this.embeddingsRegularizer = getRegularizer(args.embeddingsRegularizer);\n    this.activityRegularizer = getRegularizer(args.activityRegularizer);\n    this.embeddingsConstraint = getConstraint(args.embeddingsConstraint);\n    this.maskZero = args.maskZero;\n    this.supportsMasking = args.maskZero;\n    this.inputLength = args.inputLength;\n  }\n\n  public override build(inputShape: Shape|Shape[]): void {\n    this.embeddings = this.addWeight(\n        'embeddings', [this.inputDim, this.outputDim], this.dtype,\n        this.embeddingsInitializer, this.embeddingsRegularizer, true,\n        this.embeddingsConstraint);\n    this.built = true;\n  }\n\n  // Override warnOnIncompatibleInputShape because an embedding layer allows\n  // the input to have varying ranks.\n  protected override warnOnIncompatibleInputShape(inputShape: Shape) {}\n\n  override computeMask(inputs: Tensor|Tensor[], mask?: Tensor|Tensor[]):\n      Tensor {\n    return tidy(() => {\n      if (!this.maskZero) {\n        return null;\n      } else {\n        inputs = getExactlyOneTensor(inputs);\n        return notEqual(inputs, zerosLike(inputs));\n      }\n    });\n  }\n\n  override computeOutputShape(inputShape: Shape|Shape[]): Shape|Shape[] {\n    inputShape = getExactlyOneShape(inputShape);\n    if (this.inputLength == null) {\n      return [...inputShape, this.outputDim];\n    }\n    // inputLength can be an array if input is 3D or higher.\n    const inLens: number[] = generic_utils.toList(this.inputLength);\n    if (inLens.length !== inputShape.length - 1) {\n      throw new ValueError(\n          `\"inputLength\" is ${this.inputLength}, but received ` +\n          `input shape has shape ${inputShape}`);\n    } else {\n      let i = 0;\n      for (let k = 0; k < inLens.length; ++k) {\n        const s1 = inLens[k];\n        const s2 = inputShape[k + 1];\n        if ((s1 != null) && (s2 != null) && (s1 !== s2)) {\n          throw new ValueError(\n              `\"inputLength\" is ${this.inputLength}, but received ` +\n              `input shape has shape ${inputShape}`);\n        } else if (s1 == null) {\n          inLens[i] = s2;\n        }\n        i++;\n      }\n    }\n    return [inputShape[0], ...inLens, this.outputDim];\n  }\n\n  override call(inputs: Tensor|Tensor[], kwargs: Kwargs): Tensor|Tensor[] {\n    return tidy(() => {\n      this.invokeCallHook(inputs, kwargs);\n      // Embedding layer accepts only a single input.\n      let input = getExactlyOneTensor(inputs);\n      if (input.dtype !== 'int32') {\n        input = K.cast(input, 'int32');\n      }\n      const output =\n          K.gather(this.embeddings.read(), reshape(input, [input.size]));\n      return reshape(\n          output, getExactlyOneShape(this.computeOutputShape(input.shape)));\n    });\n  }\n\n  override getConfig(): serialization.ConfigDict {\n    const config = {\n      inputDim: this.inputDim,\n      outputDim: this.outputDim,\n      embeddingsInitializer: serializeInitializer(this.embeddingsInitializer),\n      embeddingsRegularizer: serializeRegularizer(this.embeddingsRegularizer),\n      activityRegularizer: serializeRegularizer(this.activityRegularizer),\n      embeddingsConstraint: serializeConstraint(this.embeddingsConstraint),\n      maskZero: this.maskZero,\n      inputLength: this.inputLength\n    };\n    const baseConfig = super.getConfig();\n    Object.assign(config, baseConfig);\n    return config;\n  }\n}\nserialization.registerClass(Embedding);\n"]}