@tensorflow/tfjs-layers/dist/layers/convolutional_depthwise.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: Depthwise Convolutional Layers
 */
import * as tfc from '@tensorflow/tfjs-core';
import { serialization, tidy } from '@tensorflow/tfjs-core';
import { imageDataFormat } from '../backend/common';
import * as K from '../backend/tfjs_backend';
import { checkDataFormat } from '../common';
import { getConstraint, serializeConstraint } from '../constraints';
import { ValueError } from '../errors';
import { getInitializer, serializeInitializer } from '../initializers';
import { getRegularizer, serializeRegularizer } from '../regularizers';
import { convOutputLength } from '../utils/conv_utils';
import { getExactlyOneShape, getExactlyOneTensor } from '../utils/types_utils';
import { BaseConv, preprocessConv2DInput } from './convolutional';
/**
 * 2D convolution with separable filters.
 * @param x Input tensor.
 * @param depthwiseKernel Convolution kernel for depthwise convolution.
 * @param strides Strides (Array of two integers).
 * @param padding Padding model.
 * @param dataFormat Data format.
 * @param dilationRate Array of two integers, dilation rates for the separable
 *   convolution.
 * @returns Output tensor.
 * @throws ValueError If depthwiseKernel is not a 4D array.
 */
export function depthwiseConv2d(x, depthwiseKernel, strides = [1, 1], padding = 'valid', dataFormat, dilationRate) {
    return tidy(() => {
        if (dataFormat == null) {
            dataFormat = imageDataFormat();
        }
        checkDataFormat(dataFormat);
        let y = preprocessConv2DInput(x, dataFormat);
        if (x.rank !== 4) {
            throw new ValueError(`Input for depthwiseConv2d is required to be 4-D, but is instead ` +
                `${x.rank}-D`);
        }
        if (depthwiseKernel.rank !== 4) {
            throw new ValueError(`depthwiseKernel is required to be 4-D, but is instead ` +
                `${depthwiseKernel.rank}-D`);
        }
        y = tfc.depthwiseConv2d(y, depthwiseKernel, strides, padding === 'same' ? 'same' : 'valid', 'NHWC', dilationRate);
        if (dataFormat === 'channelsFirst') {
            y = tfc.transpose(y, [0, 3, 1, 2]);
        }
        return y;
    });
}
export class DepthwiseConv2D extends BaseConv {
    constructor(args) {
        super(2, args);
        this.depthwiseKernel = null;
        this.depthMultiplier =
            args.depthMultiplier == null ? 1 : args.depthMultiplier;
        this.depthwiseInitializer = getInitializer(args.depthwiseInitializer || this.DEFAULT_KERNEL_INITIALIZER);
        this.depthwiseConstraint = getConstraint(args.depthwiseConstraint);
        this.depthwiseRegularizer = getRegularizer(args.depthwiseRegularizer);
    }
    build(inputShape) {
        inputShape = getExactlyOneShape(inputShape);
        if (inputShape.length < 4) {
            throw new ValueError(`Inputs to DepthwiseConv2D should have rank 4. ` +
                `Received input shape: ${JSON.stringify(inputShape)}.`);
        }
        const channelAxis = this.dataFormat === 'channelsFirst' ? 1 : 3;
        if (inputShape[channelAxis] == null || inputShape[channelAxis] < 0) {
            throw new ValueError('The channel dimension of the inputs to DepthwiseConv2D should ' +
                `be defined, but is not (${inputShape[channelAxis]}).`);
        }
        const inputDim = inputShape[channelAxis];
        const depthwiseKernelShape = [
            this.kernelSize[0], this.kernelSize[1], inputDim, this.depthMultiplier
        ];
        this.depthwiseKernel = this.addWeight('depthwise_kernel', depthwiseKernelShape, null, this.depthwiseInitializer, this.depthwiseRegularizer, true, this.depthwiseConstraint);
        if (this.useBias) {
            this.bias = this.addWeight('bias', [inputDim * this.depthMultiplier], null, this.biasInitializer, this.biasRegularizer, true, this.biasConstraint);
        }
        else {
            this.bias = null;
        }
        this.built = true;
    }
    call(inputs, kwargs) {
        return tidy(() => {
            inputs = getExactlyOneTensor(inputs);
            let outputs = depthwiseConv2d(inputs, this.depthwiseKernel.read(), this.strides, this.padding, this.dataFormat, null);
            // TODO(cais): Add support for dilation.
            if (this.useBias) {
                outputs = K.biasAdd(outputs, this.bias.read(), this.dataFormat);
            }
            if (this.activation != null) {
                outputs = this.activation.apply(outputs);
            }
            return outputs;
        });
    }
    computeOutputShape(inputShape) {
        inputShape = getExactlyOneShape(inputShape);
        const rows = this.dataFormat === 'channelsFirst' ? inputShape[2] : inputShape[1];
        const cols = this.dataFormat === 'channelsFirst' ? inputShape[3] : inputShape[2];
        const outFilters = this.dataFormat === 'channelsFirst' ?
            inputShape[1] * this.depthMultiplier :
            inputShape[3] * this.depthMultiplier;
        const outRows = convOutputLength(rows, this.kernelSize[0], this.padding, this.strides[0]);
        const outCols = convOutputLength(cols, this.kernelSize[1], this.padding, this.strides[1]);
        if (this.dataFormat === 'channelsFirst') {
            return [inputShape[0], outFilters, outRows, outCols];
        }
        else {
            // In this case, assume 'channelsLast'.
            return [inputShape[0], outRows, outCols, outFilters];
        }
    }
    getConfig() {
        const config = super.getConfig();
        config['depthMultiplier'] = this.depthMultiplier;
        config['depthwiseInitializer'] =
            serializeInitializer(this.depthwiseInitializer);
        config['depthwiseRegularizer'] =
            serializeRegularizer(this.depthwiseRegularizer);
        config['depthwiseConstraint'] =
            serializeConstraint(this.depthwiseRegularizer);
        return config;
    }
}
/** @nocollapse */
DepthwiseConv2D.className = 'DepthwiseConv2D';
serialization.registerClass(DepthwiseConv2D);
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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: Depthwise Convolutional Layers\n */\n\nimport * as tfc from '@tensorflow/tfjs-core';\nimport {serialization, Tensor, Tensor4D, tidy} from '@tensorflow/tfjs-core';\n\nimport {imageDataFormat} from '../backend/common';\nimport * as K from '../backend/tfjs_backend';\nimport {checkDataFormat} from '../common';\nimport {Constraint, ConstraintIdentifier, getConstraint, serializeConstraint} from '../constraints';\nimport {ValueError} from '../errors';\nimport {getInitializer, Initializer, InitializerIdentifier, serializeInitializer} from '../initializers';\nimport {DataFormat, Shape} from '../keras_format/common';\nimport {getRegularizer, Regularizer, RegularizerIdentifier, serializeRegularizer} from '../regularizers';\nimport {Kwargs} from '../types';\nimport {convOutputLength} from '../utils/conv_utils';\nimport {getExactlyOneShape, getExactlyOneTensor} from '../utils/types_utils';\nimport {LayerVariable} from '../variables';\n\nimport {BaseConv, BaseConvLayerArgs, ConvLayerArgs, preprocessConv2DInput} from './convolutional';\n\n/**\n * 2D convolution with separable filters.\n * @param x Input tensor.\n * @param depthwiseKernel Convolution kernel for depthwise convolution.\n * @param strides Strides (Array of two integers).\n * @param padding Padding model.\n * @param dataFormat Data format.\n * @param dilationRate Array of two integers, dilation rates for the separable\n *   convolution.\n * @returns Output tensor.\n * @throws ValueError If depthwiseKernel is not a 4D array.\n */\nexport function depthwiseConv2d(\n    x: Tensor, depthwiseKernel: Tensor, strides: [number, number] = [1, 1],\n    padding = 'valid', dataFormat?: DataFormat,\n    dilationRate?: [number, number]): Tensor {\n  return tidy(() => {\n    if (dataFormat == null) {\n      dataFormat = imageDataFormat();\n    }\n    checkDataFormat(dataFormat);\n    let y = preprocessConv2DInput(x, dataFormat);\n    if (x.rank !== 4) {\n      throw new ValueError(\n          `Input for depthwiseConv2d is required to be 4-D, but is instead ` +\n          `${x.rank}-D`);\n    }\n    if (depthwiseKernel.rank !== 4) {\n      throw new ValueError(\n          `depthwiseKernel is required to be 4-D, but is instead ` +\n          `${depthwiseKernel.rank}-D`);\n    }\n    y = tfc.depthwiseConv2d(\n        y as Tensor4D, depthwiseKernel as Tensor4D, strides,\n        padding === 'same' ? 'same' : 'valid', 'NHWC', dilationRate);\n    if (dataFormat === 'channelsFirst') {\n      y = tfc.transpose(y, [0, 3, 1, 2]);\n    }\n    return y;\n  });\n}\n\nexport declare interface DepthwiseConv2DLayerArgs extends BaseConvLayerArgs {\n  /**\n   * An integer or Array of 2 integers, specifying the width and height of the\n   * 2D convolution window. Can be a single integer to specify the same value\n   * for all spatial dimensions.\n   */\n  kernelSize: number|[number, number];\n\n  /**\n   * The number of depthwise convolution output channels for each input\n   * channel.\n   * The total number of depthwise convolution output channels will be equal to\n   * `filtersIn * depthMultiplier`.\n   * Default: 1.\n   */\n  depthMultiplier?: number;\n\n  /**\n   * Initializer for the depthwise kernel matrix.\n   * Default: GlorotNormal.\n   */\n  depthwiseInitializer?: InitializerIdentifier|Initializer;\n\n  /**\n   * Constraint for the depthwise kernel matrix.\n   */\n  depthwiseConstraint?: ConstraintIdentifier|Constraint;\n\n  /**\n   * Regularizer function for the depthwise kernel matrix.\n   */\n  depthwiseRegularizer?: RegularizerIdentifier|Regularizer;\n}\n\nexport class DepthwiseConv2D extends BaseConv {\n  /** @nocollapse */\n  static className = 'DepthwiseConv2D';\n  private readonly depthMultiplier: number;\n  private readonly depthwiseInitializer: Initializer;\n  private readonly depthwiseConstraint: Constraint;\n  private readonly depthwiseRegularizer: Regularizer;\n\n  private depthwiseKernel: LayerVariable = null;\n\n  constructor(args: DepthwiseConv2DLayerArgs) {\n    super(2, args as ConvLayerArgs);\n    this.depthMultiplier =\n        args.depthMultiplier == null ? 1 : args.depthMultiplier;\n    this.depthwiseInitializer = getInitializer(\n        args.depthwiseInitializer || this.DEFAULT_KERNEL_INITIALIZER);\n    this.depthwiseConstraint = getConstraint(args.depthwiseConstraint);\n    this.depthwiseRegularizer = getRegularizer(args.depthwiseRegularizer);\n  }\n\n  override build(inputShape: Shape|Shape[]): void {\n    inputShape = getExactlyOneShape(inputShape);\n    if (inputShape.length < 4) {\n      throw new ValueError(\n          `Inputs to DepthwiseConv2D should have rank 4. ` +\n          `Received input shape: ${JSON.stringify(inputShape)}.`);\n    }\n    const channelAxis = this.dataFormat === 'channelsFirst' ? 1 : 3;\n    if (inputShape[channelAxis] == null || inputShape[channelAxis] < 0) {\n      throw new ValueError(\n          'The channel dimension of the inputs to DepthwiseConv2D should ' +\n          `be defined, but is not (${inputShape[channelAxis]}).`);\n    }\n    const inputDim = inputShape[channelAxis];\n    const depthwiseKernelShape: Shape = [\n      this.kernelSize[0], this.kernelSize[1], inputDim, this.depthMultiplier\n    ];\n\n    this.depthwiseKernel = this.addWeight(\n        'depthwise_kernel', depthwiseKernelShape, null,\n        this.depthwiseInitializer, this.depthwiseRegularizer, true,\n        this.depthwiseConstraint);\n    if (this.useBias) {\n      this.bias = this.addWeight(\n          'bias', [inputDim * this.depthMultiplier], null, this.biasInitializer,\n          this.biasRegularizer, true, this.biasConstraint);\n    } else {\n      this.bias = null;\n    }\n    this.built = true;\n  }\n\n  override call(inputs: Tensor|Tensor[], kwargs: Kwargs): Tensor|Tensor[] {\n    return tidy(() => {\n      inputs = getExactlyOneTensor(inputs);\n      let outputs = depthwiseConv2d(\n          inputs, this.depthwiseKernel.read(), this.strides as [number, number],\n          this.padding, this.dataFormat, null);\n      // TODO(cais): Add support for dilation.\n      if (this.useBias) {\n        outputs = K.biasAdd(outputs, this.bias.read(), this.dataFormat);\n      }\n      if (this.activation != null) {\n        outputs = this.activation.apply(outputs);\n      }\n      return outputs;\n    });\n  }\n\n  override computeOutputShape(inputShape: Shape|Shape[]): Shape|Shape[] {\n    inputShape = getExactlyOneShape(inputShape);\n    const rows =\n        this.dataFormat === 'channelsFirst' ? inputShape[2] : inputShape[1];\n    const cols =\n        this.dataFormat === 'channelsFirst' ? inputShape[3] : inputShape[2];\n    const outFilters = this.dataFormat === 'channelsFirst' ?\n        inputShape[1] * this.depthMultiplier :\n        inputShape[3] * this.depthMultiplier;\n    const outRows = convOutputLength(\n        rows, this.kernelSize[0], this.padding, this.strides[0]);\n    const outCols = convOutputLength(\n        cols, this.kernelSize[1], this.padding, this.strides[1]);\n    if (this.dataFormat === 'channelsFirst') {\n      return [inputShape[0], outFilters, outRows, outCols];\n    } else {\n      // In this case, assume 'channelsLast'.\n      return [inputShape[0], outRows, outCols, outFilters];\n    }\n  }\n\n  override getConfig(): serialization.ConfigDict {\n    const config = super.getConfig();\n    config['depthMultiplier'] = this.depthMultiplier;\n    config['depthwiseInitializer'] =\n        serializeInitializer(this.depthwiseInitializer);\n    config['depthwiseRegularizer'] =\n        serializeRegularizer(this.depthwiseRegularizer);\n    config['depthwiseConstraint'] =\n        serializeConstraint(this.depthwiseRegularizer);\n    return config;\n  }\n}\nserialization.registerClass(DepthwiseConv2D);\n"]}