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 override 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 override 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> {
  override withFaceExpressions() {
    return new PredictAllFaceExpressionsWithFaceAlignmentTask(this, this.input);
  }

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

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

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