face-api/build/faceProcessor/FaceProcessor.js

import * as tf from '@tensorflow/tfjs-core';
import { fullyConnectedLayer } from '../common/fullyConnectedLayer';
import { NetInput } from '../dom';
import { NeuralNetwork } from '../NeuralNetwork';
import { extractParams } from './extractParams';
import { extractParamsFromWeigthMap } from './extractParamsFromWeigthMap';
import { seperateWeightMaps } from './util';
export class FaceProcessor extends NeuralNetwork {
    constructor(_name, faceFeatureExtractor) {
        super(_name);
        this._faceFeatureExtractor = faceFeatureExtractor;
    }
    get faceFeatureExtractor() {
        return this._faceFeatureExtractor;
    }
    runNet(input) {
        const { params } = this;
        if (!params) {
            throw new Error(`${this._name} - load model before inference`);
        }
        return tf.tidy(() => {
            const bottleneckFeatures = input instanceof NetInput
                ? this.faceFeatureExtractor.forwardInput(input)
                : input;
            return fullyConnectedLayer(bottleneckFeatures.as2D(bottleneckFeatures.shape[0], -1), params.fc);
        });
    }
    dispose(throwOnRedispose = true) {
        this.faceFeatureExtractor.dispose(throwOnRedispose);
        super.dispose(throwOnRedispose);
    }
    loadClassifierParams(weights) {
        const { params, paramMappings } = this.extractClassifierParams(weights);
        this._params = params;
        this._paramMappings = paramMappings;
    }
    extractClassifierParams(weights) {
        return extractParams(weights, this.getClassifierChannelsIn(), this.getClassifierChannelsOut());
    }
    extractParamsFromWeigthMap(weightMap) {
        const { featureExtractorMap, classifierMap } = seperateWeightMaps(weightMap);
        this.faceFeatureExtractor.loadFromWeightMap(featureExtractorMap);
        return extractParamsFromWeigthMap(classifierMap);
    }
    extractParams(weights) {
        const cIn = this.getClassifierChannelsIn();
        const cOut = this.getClassifierChannelsOut();
        const classifierWeightSize = (cOut * cIn) + cOut;
        const featureExtractorWeights = weights.slice(0, weights.length - classifierWeightSize);
        const classifierWeights = weights.slice(weights.length - classifierWeightSize);
        this.faceFeatureExtractor.extractWeights(featureExtractorWeights);
        return this.extractClassifierParams(classifierWeights);
    }
}
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