face-api/src/globalApi/PredictAgeAndGenderTask.ts

/* eslint-disable max-classes-per-file */
import * as tf from '../../dist/tfjs.esm';

import { AgeAndGenderPrediction } from '../ageGenderNet/types';
import { TNetInput } from '../dom/index';
import { extendWithAge, WithAge } from '../factories/WithAge';
import { WithFaceDetection } from '../factories/WithFaceDetection';
import { WithFaceLandmarks } from '../factories/WithFaceLandmarks';
import { extendWithGender, WithGender } from '../factories/WithGender';
import { ComposableTask } from './ComposableTask';
import { ComputeAllFaceDescriptorsTask, ComputeSingleFaceDescriptorTask } from './ComputeFaceDescriptorsTasks';
import { extractAllFacesAndComputeResults, extractSingleFaceAndComputeResult } from './extractFacesAndComputeResults';
import { nets } from './nets';
import {
  PredictAllFaceExpressionsTask,
  PredictAllFaceExpressionsWithFaceAlignmentTask,
  PredictSingleFaceExpressionsTask,
  PredictSingleFaceExpressionsWithFaceAlignmentTask,
} from './PredictFaceExpressionsTask';

export class PredictAgeAndGenderTaskBase<TReturn, TParentReturn> extends ComposableTask<TReturn> {
  constructor(
    // eslint-disable-next-line no-unused-vars
    protected parentTask: ComposableTask<TParentReturn> | Promise<TParentReturn>,
    // eslint-disable-next-line no-unused-vars
    protected input: TNetInput,
    // eslint-disable-next-line no-unused-vars
    protected extractedFaces?: Array<HTMLCanvasElement | tf.Tensor3D>,
  ) {
    super();
  }
}

export class PredictAllAgeAndGenderTask<
  TSource extends WithFaceDetection<{}>
> extends PredictAgeAndGenderTaskBase<WithAge<WithGender<TSource>>[], TSource[]> {
  public async run(): Promise<WithAge<WithGender<TSource>>[]> {
    const parentResults = await this.parentTask;

    const ageAndGenderByFace = await extractAllFacesAndComputeResults<TSource, AgeAndGenderPrediction[]>(
      parentResults,
      this.input,
      async (faces) => Promise.all(faces.map(
        (face) => nets.ageGenderNet.predictAgeAndGender(face) as Promise<AgeAndGenderPrediction>,
      )),
      this.extractedFaces,
    );

    return parentResults.map((parentResult, i) => {
      const { age, gender, genderProbability } = ageAndGenderByFace[i];
      return extendWithAge(extendWithGender(parentResult, gender, genderProbability), age);
    });
  }

  withFaceExpressions() {
    return new PredictAllFaceExpressionsTask(this, this.input);
  }
}

export class PredictSingleAgeAndGenderTask<
  TSource extends WithFaceDetection<{}>
> extends PredictAgeAndGenderTaskBase<WithAge<WithGender<TSource>> | undefined, TSource | undefined> {
  public async run(): Promise<WithAge<WithGender<TSource>> | undefined> {
    const parentResult = await this.parentTask;
    if (!parentResult) {
      return undefined;
    }

    const { age, gender, genderProbability } = await extractSingleFaceAndComputeResult<TSource, AgeAndGenderPrediction>(
      parentResult,
      this.input,
      (face) => nets.ageGenderNet.predictAgeAndGender(face) as Promise<AgeAndGenderPrediction>,
      this.extractedFaces,
    );

    return extendWithAge(extendWithGender(parentResult, gender, genderProbability), age);
  }

  withFaceExpressions() {
    return new PredictSingleFaceExpressionsTask(this, this.input);
  }
}

export class PredictAllAgeAndGenderWithFaceAlignmentTask<
  TSource extends WithFaceLandmarks<WithFaceDetection<{}>>
> extends PredictAllAgeAndGenderTask<TSource> {
  withFaceExpressions() {
    return new PredictAllFaceExpressionsWithFaceAlignmentTask(this, this.input);
  }

  withFaceDescriptors() {
    return new ComputeAllFaceDescriptorsTask(this, this.input);
  }
}

export class PredictSingleAgeAndGenderWithFaceAlignmentTask<
  TSource extends WithFaceLandmarks<WithFaceDetection<{}>>
> extends PredictSingleAgeAndGenderTask<TSource> {
  withFaceExpressions() {
    return new PredictSingleFaceExpressionsWithFaceAlignmentTask(this, this.input);
  }

  withFaceDescriptor() {
    return new ComputeSingleFaceDescriptorTask(this, this.input);
  }
}